DirectVent Pro
C o m p l e t e V e n t i n g S o l u t i o n s f o r t h e H e a r t h I n d u s t r y
Installation Instructions
Venting System For
Direct Vent Gas Stoves
and Fireplaces
A MAJOR CAUSE OF VENT
RELATED FIRES IS FAILURE
TO MAINTAIN REQUIRED
CLEARANCES (AIR
SPACES) TO COMBUSTIBLE
MATERIALS. IT IS OF THE
UTMOST IMPORTANCE
THAT DIRECTVENT PRO
BE INSTALLED ONLY IN
ACCORDANCE WITH THESE
INSTRUCTIONS.
NOTE:
Read through all of these instructions before
beginning your installation. Failure to install
as described in this instruction will void the
manufacturer’s warranty, and may have an
effect on your homeowner’s insurance and UL
listing status. Keep these instructions for future
reference.
Dear Customer, Installer, or End User:
I welcome any comments regarding matters
pertaining to our Simpson Dura-Vent products.
I welcome any ideas, input or complaints and
I’ll make sure that someone responds directly
back to you.
Send your emails to:
president@duravent.com
If you are searching for tech support or product
information, please phone us at 800-835-4429.
Or email us at:
techsupport@duravent.com
Sincerely,
Steve Eberhard, President and CEO
Simpson Dura-Vent Co., Inc.
CONTENTS
Application | Warning | Safety & Installation Precautions . . . . . . . . . . . . . . 4
Options | Planning Your Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Horizontal Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Snorkels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Installing Vinyl Siding Standoff . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12
Installing Counter Flashing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Vertical Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Cathedral Ceiling Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
General Maintenance / Labels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Supplemental Canadian Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Venting System for Direct Vent Gas Stoves and Fireplaces
DirectVent Pro
For the most up-to-date installation instructions, see www.duravent.com
4
APPLICATION
These instructions apply to the
Simpson Dura-Vent DirectVent Pro
4”x6-5/8” and 5”x8” systems. This
venting system, in combination
with the gas appliance, has been
tested and listed as a decorative gas
appliance system or as a direct vent
heater system by a major testing
agency such as UL, AGA, CGA,
OMNI, or Warnock Hersey. Check
the manufacturer’s rating plate and
instruction manual to conrm that the
Simpson Dura-Vent Direct Vent is
approved for use on the brand name
appliance you have selected.
IMPORTANT
Read all instructions carefully before
starting the installation. Failure to follow
these instructions may create a re or
other safety hazard and will void the
warranty. Check with the appliance
manufacturer’s installation
instructions for specic venting
and clearance to combustible
requirements, which may vary from
one appliance to another. Be sure
to comply with minimum or maximum
distances of vertical or horizontal
runs as prescribed in the appliance
manufacturer’s installation instructions.
WARNING
• Always maintain required clearances
(air spaces) to nearby combustibles
to prevent a re hazard. Do not ll
air spaces with insulation. Be sure to
check the appliance manufacturer’s
installation instructions for minimum
clearance requirements between
the outer walls of the vent pipe and
nearby combustible surfaces. Be
sure to check the vent termination
clearance requirements from decks,
windows, softs, gas regulators, air
supply inlets, and public walkways,
as specied in these installation
instructions and local building codes.
• The gas appliance and vent system
must be vented directly to the outside
of the building, and never be attached
to a chimney serving a separate solid
fuel or gas-burning appliance. Each
direct vent gas appliance must use its
own separate vent system. Common
vent systems are prohibited.
SAFETY PRECAUTIONS
FOR THE INSTALLER
• Wear gloves and safety glasses for
protection.
• Exercise extreme caution when
using ladders or on roof tops.
• Be aware of electrical wiring
locations in walls and ceilings.
INSTALLATION
PRECAUTIONS
The Simpson Dura-Vent DirectVent
Pro is an engineered product that has
been designed and tested for use with
approved direct vent gas appliances
only. The Simpson Dura-Vent
warranty will be voided, and serious
re, health, or other safety hazards
may result from any of the following
actions:
• Installation of any damaged
DirectVent Pro component.
• Unauthorized modication of the
DirectVent Pro System
5
Figure 1
Figure 2
• Installation of any non-DirectVent Pro
pipe or component part not approved
by Simpson Dura-Vent, including
DirectVent GS pipe and ttings.
• Installation other than as instructed
by Simpson Dura-Vent or the
appliance manufacturer.
Consult your local building codes
before beginning the installation.
OPTIONS
The Simpson Dura-Vent DirectVent
Pro offers a complete line of
component parts for both horizontal
and vertical installations. Many
items are offered in decorative black
as well as galvanized nish. The
galvanized pipe and ttings may be
used for concealed locations such as
attics, or spaces where corrosion is
a factor, such as above the rooine.
Decorative black painted sections
are recommended for use on visible
interior runs. Snorkel Terminations
are available for applications which
may require vertical rise on the
building exterior.
PLANNING YOUR
INSTALLATION
There are two basic types of
DirectVent Pro installations. Check the
appliance manufacturer’s installation
instructions to conrm what types
of installations are permitted and
check for any venting restrictions
such as maximum horizontal run, and
minimum or maximum vertical rise.
The two types of installations are:
• Horizontal Termination (Figs. 1 and 2)
APPLIANCE
ADAPTOR
HORIZONTAL
TERMINATION
ELBOW
ROUND
CAP SHOWN
WALL
THIMBLE
PIPE
SECTION
PIPE
SECTION
PIPE
SECTION
ROUND CEILING
SUPPORT/WALL
THIMBLE COVER
90°
ELBOW
APPLIANCE
ADAPTOR
HORIZONTAL
TERMINATION
SQUARE
CAP SHOWN
6
Figure 3
• Vertical Termination (Fig. 3)
When planning your installation,
it will be necessary to select the
proper length of vent pipe for
your particular requirements. For
horizontal installations, check the
appliance manufacturer’s installations
instructions to determine the
minimum clearance from the rear of
the appliance to the wall. It is also
important to note the wall thickness.
Select the amount of vertical rise
desired or required, for “vertical-to-
horizontal” installations (verify that it
is within the appliance manufacturer’s
minimum and maximum limits). To
determine the length of vent pipe
required for vertical installations,
measure the distance from the
appliance ue outlet to the ceiling,
the ceiling thickness, the vertical rise
in an attic or second story, and allow
for sufcient vent height above the
rooine. For two-story applications,
Firestops are required at each oor/
ceiling level. If an offset is needed in
the attic, additional pipe and elbows
will be required.
HORIZONTAL INSTALLATION
Step 1. Set the gas appliance in its
desired location. Check to determine
if wall studs or roof rafters are in
the way once the venting system
is attached. If this is the case, you
may want to adjust the location of the
appliance.
Step 2. DirectVent Pro pipe and
ttings are designed with special twist-
lock connections. To connect the
venting system to the appliance ue
outlet, a twist-lock Appliance Adaptor
is required. With some brands of
appliances, the Simpson Dura-Vent
Appliance Adaptor will be built into the
appliance at the factory. With other
brands the adaptor will be supplied
by the appliance manufacturer for
installation in the eld. Assemble the
STORM
COLLAR
ROOF
FLASHING
CEILING
FIRESTOP
CATHEDRAL
CEILING
SUPPORT BOX
PIPE
SECTION
PIPE
SECTION
ROUND CEILING
SUPPORT/WALL
THIMBLE COVER
APPLIANCE
ADAPTOR
VERTICAL
HIGH WIND
TERMINATION
CAP SHOWN
7
Figure 4
Figure 5
Figure 6
desired combination of Pipe Sections
and Elbows to the Appliance Adaptor
(Fig. 4).
Notes:
(1) Twist-lock procedure: Line up
locking lugs on male and female ends
of pipe sections. Insert the male end
of pipe into the female end until the
locking lugs are covered. Twist the
female end clockwise an eighth of a
turn to lock sections together (Fig. 5).
Screws are not required to secure the
joint, but are acceptable provided they
do not penetrate the inner wall of the
vent pipe.
(2) Horizontal runs of vent pipe
must be supported to prevent any
downward sags. Horizontal pipe
sections should be supported at least
every 4-feet. Wall Straps can be
used for this purpose. Alternatively,
plumbers tape or other suitable
noncombustible material can be used
to support the vent pipe.
(3) DirectVent Pro venting requires no
sealant, unless specically required by
appliance manufacturer.
Step 3. With the Appliance Adaptor
and Pipe Section attached to the
appliance, slide the appliance into its
correct location, and mark the wall
for a square hole of the appropriate
size. Refer to Table 1, page 8 for
the correct size square opening
unless otherwise specied by the
appliance manufacturer’s clearance
requirements. The centerline of the
pipe should line up with the center
of the square hole (Fig. 6). Cut
and frame the square hole in the
exterior wall where the vent will
be terminated. A Wall Thimble or
MALE
END
FEMALE
END
OPTIONAL
SCREWS
OF HOLE
CENTER
L
C
8
Wall Firestop may be required by the
appliance manufacturer as additional
thermal protection for the wall. If the
wall being penetrated is constructed
of noncombustible material only, i.e.
masonry block, brick, or concrete only,
a hole with zero clearance to the vent
pipe is permissible if allowed by the
appliance manufacturer.
Notes:
(1) The horizontal run of venting
must be level, or have a 1/4-inch rise
for every 1-foot of run towards the
termination. Never allow the vent to run
downward. A downward slope can trap
heat and become a possible re hazard.
(2) The location of the Horizontal Vent
Termination on an exterior wall must
meet all local and national building
codes, and must not be easily blocked
or obstructed. Termination clearances
are as follows:
(a) Clearance above the ground,
veranda, porch, deck, or balcony: 12
inches minimum.
(b) Clearance to a window (operable
or xed closed) or door: 12 inches
minimum.
(c) Vertical clearance to a ventilated
soft located above the Termination Cap
(if soft extends a horizontal distance
of 2 feet out over the centerline of the
TABLE 1
DIRECTVENT PRO FRAMING OR CUTOUT DIMENSIONS
STOCK NUMBER COMPONENT DESCRIPTION SIZE
46DVA-WT Wall Thimble 10”x 10”
46DVA-WTS Wall Thimble (Small) 9”x 9”
46DVA-WTU Wall Thimble Universal 9”x 9”
46DVA-CS Ceiling Support 10-3/4”x 10-3/4”
46DVA-FS Fire Stop 9”x 9”
46DVA-WFS Wall Fire Stop 10”x 10”
46DVA-VSS Vinyl Siding Standoff 17”x 17”
46DVA-CF Counter Flashing (Assembled) 13-1/2”x 13-1/2”
46DVA-CFK Counter Flashing (4pc.Kit) 13-1/2”x 13-1/2”
46DVA-CFKS Counter Flashing (Kit Small) 10-1/2”x 10-1/2”
46DVA-VSK Vinyl Siding Standoff (4 Pc.Kit) 13-1/2”x 13-1/2”
46DVA-VSKS Vinyl Siding Standoff (Kit Small) 10-1/2”x 10-1/2”
46DVA-IS Insulation Shield 9”x 9”
58DVA-WT Wall Thimble 10-1/2”x 10-1/2”
58DVA-WTS Wall Thimble (Small) 9”x 9”
58DVA-WTU Wall Thimble Universal 9”x 9”
58DVA-CS Ceiling Support 10-3/4”x 10-3/4”
58DVA-FS Fire Stop 10-1/2”x 10-1/2”
58DVA-WFS Wall Fire Stop 10-1/2”x 10-1/2”
58DVA-VSS Vinyl Siding Standoff 19-1/2”x 19-1/2”
56DVA-VSK Vinyl Siding Standoff (4 Pc.Kit) 16”x 16”
58DVA-CF Counter Flashing (Assembled) 16”x 16”
58DVA-CFK Counter Flashing (4pc.Kit) 16”x 16”
58DVA-IS Insulation Shield 11”x 11”
9
Figure 7
termination): 18 inches minimum.
(d) Clearance to an unventilated soft:
12 inches minimum.
(e) Clearance to an outside corner: as
tested by appliance manufacturer.
(f) Clearance to an inside corner: as
tested by appliance manufacturer.
(g) Not to be installed above a meter/
regulator assembly within 3 feet
horizontally from the centerline of the
regulator.
(h) Clearance to a service regulator
vent outlet: 6 feet minimum.
(i) Clearance to non-mechanical
air supply inlet to a building or the
combustion air inlet to any other
appliance: 12 inches minimum.
(j) Clearance to a mechanical air supply
inlet: 6 feet minimum.
(k) Clearance above a paved sidewalk
or paved driveway located on public
property: refer to local code.
(l) Clearance under a veranda, porch,
deck or balcony: 12 inches minimum.
Step 4. Position the Horizontal
Termination Cap in the center of the
square framed hole, and attach to the
exterior wall with the four wood screws
provided. Before attaching the vent
termination cap to the exterior wall,
run a bead of non-hardening silicone
sealant around it’s outside edges to
make a seal between the cap and the
wall. The arrow on the vent cap should
be pointing up. Ensure that proper
clearances to combustible materials are
maintained (Fig. 7).
WOOD
SCREWS
HOT
Notes:
(1) The four wood screws provided
should be replaced with appropriate
fasteners for use on brick, concrete,
block, or other types of sidings.
(2) For buildings with vinyl siding or
other surfaces, the Vinyl Siding Standoff
or Counter Flashing is available.
Step 5. Before connecting your
horizontal Pipe Sections to the
Horizontal Termination Cap, slide the
Wall Thimble Cover over the Pipe
Section nearest the interior side of wall
10
(Fig. 8).
Step 6. Slide the appliance and vent
assembly towards the wall, carefully
inserting the Pipe Section into the cap
assembly. It is important that the Pipe
Section extends into the back of the
Termination Cap with a minimum overlap
of 1-1/4 inches. Use the two sheet metal
screws provided to secure the Pipe
Section to the back of the Termination
Cap. The Wall Thimble Cover will cover
the screw heads (Fig. 8).
Step 7. Slide the Wall Thimble Cover
up to the wall surface and attach to
the wall with screws provided (Fig. 9).
Apply optional decorative brass trim to
Wall Thimble Cover, if desired.
SNORKELS
For installations requiring a vertical
rise on the exterior of the building,
14-inch and 36-inch tall Snorkel
Terminations are available (Fig. 10).
Follow the same general installation
procedures as used for a standard
Horizontal Termination. The standard
Wall Thimble or Wall Firestop can
be used with the Snorkel, but the
exterior plate will overhang the edges
of the Snorkel. However, a universal
Wall Thimble is available for use
with the Snorkel that is not visible
on the exterior of the building (46 or
58DVA-WTU). To install the Universal
Wall Thimble, insert the thimble from
the interior of the house and adjust
the length of the tube to ensure it
touches the backside of the Snorkel
when installed (Fig. 10). Secure the
tube in place using 2 sheet metal
screws. Mount the Wall Thimble
in place. Attach the Snorkel to the
wall using wood screws or other
appropriate fasteners, depending
on wall construction. If the Snorkel
Termination must be installed below
grade level, (e.g. in a basement
application), proper drainage must
be provided to prevent water from
entering the Snorkel Termination
(Fig. 11). Do not attempt to enclose
the Snorkel within the wall or any
other type of enclosure.
Figure 9
WOOD
SCREWS
Figure 8
SHEET
SCREWS
METAL
WALL
COVER
THIMBLE
11
Figure 10
SNORKEL
12" MINIMUM
ADJUST AND SECURE
OPTIONAL DVA-WTU
TELESCOPING THIMBLE
SLEEVES WITH SCREWS
SNORKEL
12" MINIMUM
ADEQUATE
DRAINAGE
WALL
COVER
THIMBLE
Figure 11
12
Figure 12
VINYL SIDING INSTALLATION
The Vinyl Siding Standoff prevents
excessive heat from potentially warping
or melting the vinyl siding material.
Vinyl Siding Standoffs are not used with
Snorkels. The Vinyl Siding Standoff is
available in either a 1-piece version or a
4-piece version.
Installing the 1-piece Vinyl Siding
Standoff: Cut a square opening in
the vinyl siding centered around the
framed opening, in accordance with the
dimensions provided in Table 1, page 8.
Mount the Vinyl Siding Standoff to the
wall using the screws provided.
Seal around the perimeter of the Vinyl
Siding Standoff using non-hardening
waterproof sealant to help ensure a
weather tight seal.
Secure the Horizontal Termination Cap
to the Vinyl Siding Standoff using the (4)
long screws provided with the cap.
Installing the 4-piece Vinyl Siding
Standoff: The Vinyl Siding Standoff
should be assembled and installed
on the wall between the Horizontal
Cap and the building exterior. Cut
a square opening in the vinyl siding
centered around the framed opening,
in accordance with the dimensions
provided in Table 1, page 8.
The 4 pieces of the Vinyl Siding
Standoff (or Counter Flashing) must
be assembled in specic order to help
ensure a weather tight t.
Loosely assemble the four parts,
in order, around the opening in the
vinyl siding. Place the rst of 4 pieces
along the upper edge of the opening in
CUT EXTERIOR
OF WALL AS
REQUIRED IN
ASSEMBLE VINYL
STANDOFF/COUNTER
SPECIFIC ORDER
TABLE 1
FLASHING IN
VINYL SIDING,
STUCCO OR OTHER
SIDING MATERIAL
1
2
3
4
HOT
HOT
HOT
4 PC. KIT
ASSEMBLED IN
SEQUENCIAL
ORDER
FASTEN THE
4 CORNERS
THROUGH
THE HOLES
PROVIDED
FASTEN TERMINATION
TO ASSEMBLY
THROUGH THE
HOLES PROVIDED
SQUARE
ROUND
CAP
SCONCE
CAP
CAP
1st
2nd
3rd
4th
HOT
PLUMB AND LEVEL
ENSURE ASSEMBLY IS
GAPS
& SCREWS
SEAL ALL
CONNECT TO WALL
AS REQUIRED
13
the vinyl siding. Progressing counterclockwise, place the left side, the
bottom side, and then the right side
around the opening in the siding. Refer
to Figure 12.
With the 4 pieces in place secure the
pieces together using the pre-drilled
holes and the screws provided.
Seal around the inside corners of the
Vinyl Siding Standoff to help ensure a
weather tight installation.
Attach the Horizontal Cap to the
Vinyl Siding Standoff. Line up the holes
in the cap with the holes in the Vinyl
Siding Standoff and secure with the (4)
long screws provided with the cap.
Secure the Vinyl Siding Standoff to
the wall as appropriate. Depending on
the construction of your wall, different
methods of securing the standoff and
cap may be required. The Vinyl Siding
Standoff’s anges extend 2” under the
siding and can be secured to the wall
by using screws through the siding
and ange if needed.
Seal around the perimeter of the
Vinyl Siding Standoff using nonhardening waterproof sealant to help
ensure a weather tight seal.
COUNTER FLASHING
INSTALLATION
The Counter Flashing is typically
installed before siding or stucco
is nished and helps to ensure a
weather tight penetration through
the wall. The Counter Flashing
allows stucco, or other materials,
to be nished up to the edges of
the Counter Flashing. Under no
circumstances should stucco or other
material cover Termination Cap or
air inlets. The Counter Flashing is
available in both 1-piece and 4-piece
versions.
Installing the 1-piece counter
ashing: Center the counter ashing on
the wall around the framed penetration.
Secure to the wall using the screws
provided or other necessary connector
depending on the wall material. Attach
the Horizontal Cap to the Counter
Flashing by lining up the holes in the
cap with the holes in the Counter
Flashing. Secure using the 4 long
screws provided with the cap (Fig. 12).
Installing the 4-piece Counter
Flashing: Attach the 4 pieces together
starting with the top piece and work
counter-clockwise.
Secure the 4 pieces together before
mounting Counter Flashing to the wall.
Mount the assembled Counter Flashing
on the wall, centered around the framed
wall penetration.
Depending on wall construction, use
screws or other suitable connector
through the anged edges to secure
Counter Flashing to the wall.
Seal around the perimeter of the
Counter Flashing using non-hardening
waterproof sealant to help ensure a
weather tight seal.
(4) If the optional copper version of
Horizontal Termination Cap is installed,
use an appropriate non-combustible
material to avoid direct contact between
the galvanized and copper metals to
prevent possible galvanic reaction.
14
Figure 14
VERTICAL INSTALLATION
Step 1. Check the appliance
manufacturer’s installation instructions
for required clearances (air spaces) to
combustibles when passing through
ceilings, walls, roofs, enclosures, attic
rafters, or other nearby combustible
surfaces. Do not pack air spaces
with insulation. Check the appliance
manufacturer’s instructions for
maximum vertical rise of the venting
system and any maximum horizontal
offset limitations.
Step 2. Set the gas appliance in the
desired location. Drop a plumb bob
down from the ceiling to the position of
the appliance ue exit, and mark the
location where the vent will penetrate
the ceiling. Drill a small hole at this
point. Next, drop a plumb bob from
the roof to the hole previously drilled
in the ceiling, and mark the spot
JOISTS
CEILING
CUT
AND FRAME
DECORATIVE
COVER
1 1/2"
WOOD SCREWS
SUPPORT
CEILING
FRAMING
DECORATIVE
COVER
1 1/2"
WOOD SCREWS
SUPPORT
CEILING
FRAMING
Figure 13
MARK
LOCATION
DRILL
PLUMB
MARK AND
BOB
15
Figure 15
Figure 16
EXTENSION
PIPE
SECTION
PIPE
WALL
PLUMBERS
STRAP/
TAPE
45°
ELBOW
45°
ELBOW
where the vent will penetrate the roof
(Fig. 13). Determine if ceiling joists,
roof rafters, framing or other materials
will obstruct the venting system. You
may wish to relocate the appliance, or
to offset, to avoid cutting load-bearing
members.
Step 3. To install the Round Ceiling
Support/Wall Thimble Cover in a at
ceiling, refer to Table 1, page 8 and
cut a square hole in the ceiling (unless
otherwise specied by the appliance
manufacturer) centered on the hole
drilled in Step 2. Frame the hole as
shown (Fig. 14).
Step 4. If the twist-lock Appliance
Adaptor has not been installed on the
stove by the manufacturer, install it
now in accordance with the appliance
instruction manual.
Step 5. Assemble the desired Pipe
Sections and Elbows necessary to
reach from the Appliance Adaptor up
through the Round Ceiling Cover or
Support Box. Ensure that all Pipe and
Elbow connections are in their fully
twist-locked position.
Step 6. Cut a hole in the roof
centered on the small drill hole placed
in the roof in Step 2. The opening
should be of sufcient size to meet the
minimum requirements for clearance
to combustibles, as specied by the
appliance manufacturer. Continue to
assemble Pipe Sections and Elbows
as necessary to reach up through the
rooine. Galvanized Pipe and Elbows
may be utilized in the attic, as well as
above the rooine. The galvanized
nish is desirable above the rooine,
due to higher corrosion resistance.
Notes:
(1) If exact lengths or distances must
be met between Elbow offsets or
elsewhere, use the Pipe Extensions
to adjust onto standard Pipe Sections
(Fig. 15).
(2) If an offset is necessary in the attic
to avoid obstructions, it is important to
support the vent pipe in order to avoid
excessive stress on the Elbows. Wall
Straps or plumbers tape may be used
for this purpose (Fig. 16).
16
(3) Wherever possible, use 45°
Elbows instead of 90° Elbows. The
45° Elbow offers less restriction to the
ow of ue gases and intake air.
Step 7. Slip the Roof Flashing over
the Pipe Section(s) protruding through
the roof. Use a non-hardening sealant
between the Roof Flashing and the
roong to prevent water leakage.
Secure the base of the Roof Flashing
to the roof with roong nails. Ensure
the roong material overlaps the
top edge of the Roof Flashing (Fig.
18). Verify that you have at least the
minimum clearance to combustibles at
the rooine and in the attic.
Step 8. Continue to add Pipe Sections
until the height of the system (before
adding the Cap) meets the minimum
building code requirements as
described in (Table 2 and Fig. 17).
Note that for steep roof pitches, the
vent height must be increased. In
high wind conditions, nearby trees,
adjoining rooines, steep pitched
roofs, and other similar factors can
result in poor draft, or down drafting.
In these cases, increasing the vent
height or switching to the High Wind
Termination Cap may help to solve the
problem.
Step 9. Slip the Storm Collar over
the Pipe Section, and push it down to
the top of the Roof Flashing (Fig. 18).
Use non-hardening sealant between
the Storm Collar and the Pipe Section.
Step 10. Holding the bottom of the
Termination Cap only, twist lock
the cap onto the last Pipe Section
protruding above the rooine.
Notes:
(1) For multi-story vertical
installations, a Ceiling Firestop is
required at the second oor, and any
subsequent oors (Fig. 19). Refer
to Table 1, page 8. Cut and frame a
square opening for installation of the
Ceiling Firestop.
(2) If Vent passes through any
occupied areas above the rst oor,
including closets and storage spaces,
it must be enclosed. The enclosure
may be framed and sheetrocked with
standard construction materials, but
required clearances to combustibles
must be maintained. Consult the
appliance manufacturer’s installation
instructions for the minimum allowable
clearance between the outside of
Figure 17
DIMENSION
FROM TABLE 2
"H" OBTAINED
TABLE 2
ROOF PITCH
MINIMUM
HEIGHTMinim
Feet Meters
Flat to 7/12 1 0.3
Over 7/12 to 8/12 1.5 0.46
Over 8/12 to 9/12 2 0.61
Over 9/12 to 10/12 2.5 0.76
Over 10/12 to 11/12 3.25 0.99
Over 11/12 to 12/12 4 1.22
Over 12/12 to 14/12 5 1.52
Over 14/12 to 16/12 6 1.83
Over 16/12 to 18/12 7 2.13
Over 18/12 to 20/12 7.5 2.29
Over 10/12 to 21/12 8 2.44
17
the vent pipe, and the combustible
surfaces of the enclosure. Do not ll
required air spaces with insulation.
(3) If venting system passes through
an attic space the Attic Insulation
Shield must be installed to prevent
contact between Pipe Sections and
the insulation or other debris. Nail the
base to oor of attic and adjust shield
for appropriate insulation level, then
attach the collar at the top of assembly
(Fig. 19). For vaulted ceilings, the
Attic Insulation Shield cannot be
installed. To prevent building insulation
and other debris from entering the
support box or contacting the pipe, a
chase enclosure can be constructed
around the support box. Ensure
proper clearance to combustibles
is maintained as prescribed by the
appliance manufacturer.
Figure 18
SECURE FLASHING
WITH NON-HARDENING
OPTIONAL
LOW PROFILE
HIGH WIND
VERTICAL
STORM
COLLAR
ROOF
FLASHING
TERMINATION
TERMINATION CAP
SEALANT AND
ROOFING NAILS
Figure 19
SHIELD
NAILS
REQUIRED
APPLIANCE MFG
INSULATION
ATTIC
CLEARANCE
REQUIRED BY
CLEARANCE AS
APPLIANCE MFG
REQUIRED BY
CLEARANCE AS
Figure 21
Figure 22
18
CATHEDRAL CEILING
INSTALLATION
Step 1. Follow installation Steps 1
and 2 under Vertical Terminations.
Step 2. Using the plumb bob, mark
the centerline of the venting system
on the ceiling and drill a small hole
through the ceiling and roof at this
point. From the roof, locate the drill
hole and mark the outline of the
Cathedral Ceiling Support Box.
Step 3. Remove shingles or other
roof covering as necessary to cut the
rectangular hole for the Support Box
(refer to Table 1 for dimensions).
Cut the hole 1/8-inch larger than the
Support Box outline.
Step 4. Lower the Support Box
through the hole in the roof until
Support Box protrudes at least
2-inches below the low side of the
ceiling (Fig. 20). Align the Support
Box both vertically and horizontally
with a level. Temporarily tack the
Support Box in place through
the inside walls and into the roof
sheathing.
Step 5. Using tin snips, cut the
Support Box from the top corners
down to the rooine, and fold the
resulting aps over the roof sheathing.
The aps may be trimmed as needed
(Fig. 21). Before nailing it to the roof,
run a bead of non-hardening sealant
around the Support Box, to make a
seal between the Support Box and
the roof. Clean out any combustible
material from inside the Support Box.
Step 6. Follow Steps 4 and 5
(page 14) of the Vertical Installation
Instructions.
SUPPORT
BOX
CATHEDRAL
CEILING
SCREWS
TRIM
CEILING
OVERLAP
Figure 20
LEVEL
CATHEDRAL
CEILING
FINISHED
CEILING
2' MIN
BELOW
CUT HOLE 1/8"
LARGER THAN
SUPPORT BOX
SUPPORT BOX
19
Step 7. Place the Support Clamp
(provided with the Support Box) inside
the Support Box (at the bottom),
and secure to the Pipe Section.
The Clamp allows the Support Box
to support the weight of the Pipe
Sections. Continue to add Pipe
Sections until you are above the
rooine.
Step 8. Follow Steps 7 through
10 (page 15 & 16) of the Vertical
Installation Instructions.
Step 9. Install the black Trim Collar
around the outside of the Cathedral
Ceiling Support Box. The two pieces
of the Trim Collar slide over one
another to allow for easy adjustment
around the Support Box. Using the six
(6) screws provided, secure the four
corners and the overlapping sections
of the Trim Collar to the underside of
ceiling. You may want to pre-drill the
holes for the overlapped sections for
ease of installation (Fig. 22).
20
GENERAL MAINTENANCE
Conduct an inspection of the venting
system annually. Recommended
areas to inspect are as follows:
1. Check areas of the Venting System
which are exposed to the elements
for corrosion. These will appear as
rust spots or streaks, and in extreme
cases, holes. These component
should immediately be replaced.
2. Remove the Vertical Termination
Cap and shine a ashlight down the
Vent. Remove any bird nests, or other
foreign material.
3. Check for evidences of excessive
condensation, such as water
droplets forming in the inner liner,
and subsequently dripping at joints.
Continuous condensate can cause
corrosion of caps, pipe, and ttings. It
may be caused by having excessive
lateral runs, too many elbows, and
exterior portions of the system being
exposed to cold weather.
4. Inspect joints to verify that no
Pipe Sections or Fittings have been
disturbed or loosened. Also check
mechanical supports such as Wall
Straps or plumbers tape for rigidity.
LABELS All components are
labeled with the appropriate
identication information, and the UL
listing data, where applicable.
21
22
SUPPLEMENTAL CANADIAN
INSTRUCTIONS
When installing DirectVent Pro on
appliances in Canada, a 2-piece Wall
Thimble is required in order to comply
with IR #41 (Fig. 1 and Fig. 2). Cut
and frame an opening in the wall in
accordance with the dimensions in
Table 1, page 8. Install galvanized
exterior Wall Thimble plate on exterior
of building and the other half of the
Wall Thimble on the interior side of
wall. Install Wall Thimble centered
through a square framed opening in
wall. Install a Wall Thimble Cover on
the wall to cover the inside portion of
the Wall Thimble. Be sure to maintain
all minimum clearances specied
by appliance manufacturer. When
installing DirectVent Pro vertically
through oors (Fig. 3) a Ceiling
Firestop is required at every oor/
ceiling level. Refer to appliance
manufacturer installation instructions
for complete installation procedure.
Figure 2
Figure 1
APPLIANCE
ADAPTOR
SUPPORT/WALL
THIMBLE COVER
PIPE
SECTION
2 PIECE
WALL THIMBLE
DECORATIVE CEILING
SQUARE HORIZONTAL
TERMINATION CAP
ROUND, SCONCE OR
PIPE
SECTION
PIPE
SECTION
90°
ELBOW
APPLIANCE
ADAPTOR
SUPPORT/WALL
THIMBLE COVER
SQUARE HORIZONTAL
TERMINATION CAP
ROUND, SCONCE OR
2 PIECE
WALL THIMBLE
DECORATIVE CEILING
23
Figure 3
STORM
COLLAR
ROOF
FLASHING
CEILING
FIRESTOP
CATHEDRAL
CEILING
SUPPORT BOX
PIPE
SECTION
PIPE
SECTION
ROUND CEILING
SUPPORT/WALL
THIMBLE COVER
APPLIANCE
ADAPTOR
VERTICAL
HIGH WIND OR
TERMINATION CAP
LOW PROFILE
L954 08|2008
Customer Service Support 800-835-4429 707-446-4740 FAX wwww.duravent.com
Simpson Dura-Vent, Inc
PO Box 1510
Vacaville CA 95696-1510
Simpson Dura-Vent:
50 years of Engineered Excellence®
Manufactured in Vacaville CA
and Vicksburg MS
SIMPSON DURA-VENT LIMITED LIFETIME WARRANTY
Simpson Dura-Vent (“Simpson”) warrants the products identied below to the original purchaser to be free from substantial
defects in material or manufacturing for the lifetime of the product, if properly installed, maintained and used. This Warranty
does not cover normal wear and tear, smoke damage or damage caused by chimney res, or any Product that was: (1)
purchased other than from an authorized Simpson dealer, retailer or distributor; (2) modied or altered; (3) improperly
serviced, inspected or cleaned; or (4) subject to negligence or any use not in accordance with the printed materials provided
with the Product as determined by Simpson Dura-Vent. This warranty includes all components and ttings, except caps.
Caps have a 5 year warranty from the date of purchase, with dated proof of purchase. This lifetime warranty applies
only to parts manufactured by Simpson Dura-Vent. This warranty may not be extended or modied by our agents or
representatives.
For 15 years from the date of purchase of a DuraTech Chimney, DuraPlus Chimney, DuraPlus HTC Chimney,
PelletVent Pro, PelletVent, CornVent, DuraLiner, DuraFlex, DirectVent Pro, Type B Gas Vent, DuraConnect, or DVL,
with dated proof of purchase, Purchaser’s sole remedy is replacement of component ttings and chimney pipe lengths
(removal and installation costs paid by Purchaser). From year 16, for the life of such Product, Purchaser’s sole remedy
is replacement of chimney pipe lengths at 50% of the retail list price in effect at the time of replacement (removal and
installation costs and 50% of the retail list price paid by Purchaser).
For 5 years from the date of purchase of a DuraBlack Single-Wall Stovepipe, with dated proof of purchase, Purchaser’s
sole remedy is replacement of component ttings and chimney pipe lengths (removal and installation costs paid by
Purchaser).
Simpson may inspect your Product to determine if, in Simpson’s sole discretion, the Product qualies for replacement under
the terms of this Warranty. To obtain warranty service go to www.duravent.com or contact Simpson promptly at
800-835-4429. The replaced Product is warranted under the terms of this Warranty.
Where lawful, Simpson disclaims all other warranties, including but not limited to implied warranties of
merchantability and tness for a particular purpose. In no event will Simpson be liable for incidental,
consequential, punitive or special damages or direct or indirect loss of any kind, including but not limited to
property damage and personal injury. Simpson’s entire liability is limited to the purchase price of this product.
Some states do not allow limitations on implied warranties, or the exclusion or limitation of incidental or
consequential damages, so the above limitations and exclusions may not apply to you. This limited warranty gives
you specic legal rights, and you may also have other rights that vary from state to state.
DirectVent Pro is a
registered trademark of the Simpson Dura-Vent Co., Inc. All rights reserved, 2008. Made in the USA.
Simpson Dura-Vent is a division of Simpson Manufacturing Company. NYSE:SSD.
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