DuraVent PelletVent Pro User Manual

Installation Instructions

Venting System for Pellet, Corn, Oil,
and Biofuel appliances.

PelletVent Pro

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 DOUBLE WALL PELLETVENT 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. This booklet also contains
instructions for installing a venting system
within an existing masonry chimney, and
for installations passing through a cathedral

ceiling.

Dear Customer, Installer, or End User:

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pertaining to our DuraVent products.
We welcome any ideas, input or complaints
and I’ll make sure that someone responds
directly back to you.
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LISTED

MH8381

MH14420

VENTING SYSTEM FOR PELLET, CORN, OIL, AND BIOFUEL APPLIANCES.

For the most up-to-date installation instructions, see www.duravent.com

CONTENTS

Clearances, Vent Listing, Installation Notes, Lubricants & Gaskets . . . . 4

Sealants, Fuel Selection, Best Practices . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Tools Needed, Permits, General Installation Instructions . . . . . . . . . . . . . . .6

Installation into Masonry Fireplaces . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Installation Through Side of Masonry Chimney . . . . . . . . . . . . . . . . . . . . . .17

Installation in a Cathedral Ceiling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Cleaning and Maintenance .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

PelletVent Pro

3

CLEARANCES AND APPLICATIONS

Dura-Vent’s PelletVent Pro is listed by
Underwriters Laboratories as vent for listed
appliances that burn oil, pellet, corn, and other
biofuels. PelletVent Pro is also listed as a
masonry reliner with the minimum clearance
is 0” from vent to masonry, and 0” clearance
from the masonry to nearby combustibles.
Never ll any required clearance space with
insulation or any other materials. Combustible
materials include (but are not limited to)
lumber, plywood, sheetrock, plaster and
lath, furniture, curtains, electrical wiring, and
building insulation of any kind.

In the United States and Canada the minimum
clearance to combustibles from PelletVent
Pro is 1” for oil, pellet, corn or other biofuel
applications.

VENT LISTING

PelletVent Pro is listed by Underwriters
Laboratories (listing numbers MH8381 &
MH14420) to the American standard UL 641
Type L Low Temperature Venting Systems,
and is also listed to the Canadian standards
ULC S609 Standard for Low Temperature
Vents Type L and ULC/ORD-C441 Standard
for Pellet Vents .

INSTALLATION NOTES

Proper planning for your PelletVent Pro
installation will result in greater safety,
efciency, and convenience, saving both time
and money. Use only authorized Dura-Vent
PelletVent, CornVent, and PelletVent Pro
biofuel listed parts. Do not install damaged
parts.

1. WARNING: When passing through ceilings
and walls, make sure all combustible materials

and building insulation products are a
minimum of 1” from the vent pipe

2. For horizontal terminations, make sure
NFPA 211 rules are followed for minimum
distance from windows and openings.

3. Do not mix and match with other
manufacturer’s products or improvised
solutions.

4. Practice good workmanship. Sloppy
work could jeopardize your PelletVent Pro
installation.

5. Never use a vent with an inside diameter
that is smaller than the appliance ue outlet.

6. Multistory: Where PelletVent Pro passes
through the ceiling, use Dura-Vent Firestop/
Support assembly.

7. PelletVent Pro placement: When deciding
the location of your stove and vent, try to
minimize the alteration and reframing of
structural components of the building.

8. Sections of pipe are connected to each
other by pushing them rmly together and
twisting. Screws are not required. However, if
screws are desired, use 1/4”-long sheet metal
screws. Important! Do not penetrate the inner
liner with screws.

9. Never install single-wall pipe to freestanding
pellet stoves. Single-wall pipe may be
connected to a replace insert, provided it
is inside the replace, and the replace has
completely sealed surroundings.

10. Do not connect Type B Gas Vent pipe with
aluminum liners to pellet appliances.

LUBRICANTS & GASKETS

PelletVent Pro utilizes an internal O-ring
gasket on the outside of the inner liner in the
female end of the Pipe Section. These gaskets
are lubricated and help seal Pipe Sections as
they are connected together. If your O-ring
gasket is missing or it becomes unseated
during connection, you must replace and

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lubricate the new O-ring gasket. Replacement
gaskets and silicone lubricants are available to
order from the PVP catalog or our website at
duravent.com.

SEALANTS

PelletVent Pro does not require additional
sealant to be used at pipe joints, but in certain
circumstances sealant may be used if desired.
Seal the inner liner overlap at the male end of
pipe for best results (Figure 6)
Note: 500ºF RTV silicone sealant is required
on the following component connections:

• Connecting PelletVent Pro biofuel
(with gaskets) to PelletVent
Pro (without gasket) or another
PelletVent or CornVent.

• Connecting Appliance Adapter or any
other part when connecting to the
appliance outlet

• When using the Adjustable Length
section.

FUEL SELECTION, BEST
PRACTICES

PelletVent Pro is a multi-fuel venting
system approved for burning wood
pellets, corn, and other approved biofuels,
plus, oil and kerosene. Be sure to follow
the recommendations of the appliance
manufacturer for the burning of corn or other
types of biofuel. A major reason for accelerated
vent corrosion from burning corn is due to
acidic condensate forming in the system.
The moisture content of corn contributes
signicantly to condensate in the vent. The
lower the moisture content of the corn, the less
condensate you are likely to have in the vent.
While corn with a moisture content of 15%
may be allowed in the appliance, using a fuel
with lower moisture content will help reduce
condensate formation.

Vent Runs: Condensate is more likely to
form in longer vents because the exhaust
temperature cools further away from the
appliance. If the exhaust cools to a certain
point, moisture in the exhaust condenses
in the vent, which can lead to accelerated
vent corrosion. Keep the vent for corn­burning appliances short wherever possible
to maintain hot ue gas temperatures and
keep moisture suspended in the exhaust. If a
longer horizontal vent or taller vertical vent is
needed, it is recommended that the vent run
inside the building envelope or inside a chase
enclosure to minimize the vent’s exposure to
cold temperatures. When terminating a corn
burning system horizontally a stainless steel
outer Pipe Section and the Round Horizontal
Termination Cap are required. Be sure to
follow all other applicable building codes
and maintain all minimum clearances in
enclosures.
Appliance Operation: Regardless of the fuel
you choose always operate your appliance in
accordance with the appliance manufacturer’s
recommendations. If you burn corn, operating
the appliance at its lowest setting has a greater
chance for condensate to form in the vent due
to the low exhaust temperature. In order to
help reduce condensate from forming inside
the vent system, operate the appliance at
higher temperatures when colder weather is
encountered. Higher operation settings provide
for warmer ue temperatures, which help to
keep moisture suspended in the ue gases.
Inspection and Maintenance: When burning
corn, be sure to inspect the appliance and
vent often to determine if there has been any
corrosion or damage to the system. Be sure
to keep the venting system clean, including
the tee cap (if applicable). The ash that results
from burning corn can trap condensate in
the tee cap and inside the vent, hastening

5

corrosion to the system if left unchecked.
Using pelletized fuel does not eliminate the
need for inspection and cleaning. Lesser
quality pellets create more soot accumulation
and can clog venting sooner than the cleaner
burning pellets. While it is not necessary to
clean out liquid fuel burning systems with a
brush, all other systems should be visually
inspected monthly during the heating season,
and cleaned at least once a year

TOOLS AND EQUIPMENT YOU
MAY NEED

Eye Protection
Gloves
Screwdriver
Hammer
High-Temperature Waterproof (RTV) Sealant
Tape Measure
Saber or Keyhole Saw
Level and Plumb bob

PERMITS

Contact your local building department or
re ofcials regarding any needed permits,
restrictions, and installation inspection
requirements in your area.

GENERAL INSTALLATION
INSTRUCTIONS

PelletVent Pro is listed with a minimum 1”
clearance to combustibles

1. Follow the stove/appliance manufacturer’s

instructions.
A. Choose an appliance that is listed by a
recognized testing laboratory.

B. Connect only one ue per appliance.
C. Only burn fuels approved for use by your

appliance manufacturer.

PELLET VENT PRO
PIPE

Figure 1

D. Follow the appliance manufacturer’s

instructions and safety manual for maximum
efciency and safety. Over ring can damage
the appliance and vent.

2. If the vent exit is on top of the stove

(Figure 1):
A. Place the appliance according to the
manufacturer’s instructions.
B. Drop a plumb bob to the center of the
appliance ue outlet and mark center point on

6

the ceiling (Figure 2). At your marked center
point, cut and frame a square hole in the
ceiling for installation of the Ceiling Support or
Firestop Spacer (Figure 3). Refer to Table 1
for the dimensions of the hole.
C. Connect Pipe Adapter or Increaser Adapter
to stove: Due to the variety of different stove
collars, the Pipe Adapter will need high­temperature non-hardening sealant in order to
achieve a leak-free connection. .
D. Connect Pipe Sections. Attach PelletVent
Pro Pipe Sections by pushing male and female
ends of pipe together and twisting until pipe
is in locked position (Figure 4). PelletVent

Figure 2

PELLETVENT PRO

COMPONENT

3" & 4" CEIL ING SUPPO RT /

FIRES TOP SPACER

3" & 4" CATHEDR AL CEILI NG

SUPPO RT BOX

3" & 4" WALL THIMBL E

3" & 4" CAS WALL TH IMBLE

3" & 4" WALL THIMBL E AIR

INTAKE K IT

FRAMING DIMENSIONS

7" X 7"

10 ¾" X 10 ¾"

7 ½" x 7 ½"

9" X 9"

Table 1

Figure 3

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Figure 4

Figure 5

Figure 6 Figure 7

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