Vermont Casting BHDT36 User Manual
Direct V ent
T op V ent
BHDT36
Installation Instructions & Homeowner's Manual
Model
WARNING!
EXPLOSION MAY RESULT CAUSING PROPERTY DAMAGE,PERSONAL INJURY OR LOSS OF LIFE.
FOR YOUR SAFETY
WHAT TO DO IF YOU SMELL GAS:
• Do not try to light any appliance.
• Do not touch any electric switch
• Do not useany phone in your building.
• Immediately call your gas supplier from
your neighbours phone. Follow the gas
suppliers instructions.
• If you cannot reach your gas supplier call the
fire department.
INSTALLER: DO NOT DISCARD THIS MANUAL - LEAVE FOR HOMEOWNER
IF THE INFORMATION IN THIS MANUAL IS NOT FOLLOWED EXACTLY, A FIRE OR
FOR YOUR SAFETY
DO NOT STORE
OR USE GASOLINE OR OTHER
FLAMMABLE VAPOURS AND LIQUIDS
IN THE VICINITY OF THIS OR ANY
OTHER APPLIANCE.
• Installation and service must be performed
by a qualified installer, service agency or
your gas supplier.
The Vermont Castings
Majestic Products Company
410 Admiral Blvd., Mississauga
Ontario, Canada L5T 2N1
www.majesticproducts.com / www.vermontcastings.com
11/01 Rev.1
10001827
- 1 -
TABLE OF CONTENTS
PLEASE READ THE INSTALLATION & OPERATING INSTRUCTIONS BEFORE USING APPLIANCE.
Thank you and congratulations on your purchase.
IMPORTANT: R
instructions may result in a possible fire hazard and will void the warranty.
Installation Instructions ........................................................................................................................................... 3
General Venting Information 8
Operating Instructions 25
Replacement Parts List ........................................................................................................................... 31
Options 33
ead all instructions and warnings carefully before starting installation. Failure to follow these
General Information.................................................................................................................................... 3
Locating your Fireplace .............................................................................................................................. 4
Fireplace Dimensions ................................................................................................................................. 5
Mantels .................................................................................................................................................... 5
Mantel Chart ............................................................................................................................................... 5
Clearance to Combustibles ........................................................................................................................ 5
Framing & Finishing.................................................................................................................................... 5
Final Finishing ............................................................................................................................................ 6
Hearth .................................................................................................................................................... 6
Gas Specifications...................................................................................................................................... 6
Gas Line Installation ................................................................................................................................... 7
Remote Switch Installation ......................................................................................................................... 7
Termination Clearances ............................................................................................................................. 9
Assembling Vent Pipes With Crimped Ends ........................................................................................ 10
Vertical Sidewall Applications ............................................................................................ 10
How To Use the Vertical Sidewall Venting Graph ..................................................................... 11
Vertical Sidewall Installation...................................................................................................... 12
Below Grade Installations.......................................................................................................... 14
Vertical Through the Roof Applications ..................................................................................... 14
Vertical Through the Roof Installation ....................................................................................... 15
Crimped End Venting Components........................................................................................... 16
Assembling Twist Lock Vent Pipes ................................................................................................. 17
Vertical Sidewall Applications.................................................................................................... 17
How To Use the Vertical Sidewall Venting Graph ..................................................................... 19
Vertical Sidewall Installation...................................................................................................... 19
Below Grade Installations.......................................................................................................... 21
Vertical Through the Roof Applications ..................................................................................... 22
Vertical Through the Roof Installation ....................................................................................... 23
Twist Lock Venting Components............................................................................................... 24
General Glass Information........................................................................................................................ 25
Louvre Removal ....................................................................................................................................... 25
Glass Cleaning ......................................................................................................................................... 25
Glass Frame Removal.............................................................................................................................. 25
Installation of Logs.................................................................................................................................... 26
Lava Rock................................................................................................................................................. 26
Flame Adjustment..................................................................................................................................... 26
Flame Characteristics............................................................................................................................... 27
Inspecting the Venting System ................................................................................................................. 27
Maintenance ............................................................................................................................................. 27
Cleaning the Standing Pilot ...................................................................................................................... 27
Lighting and Operating Instructions.......................................................................................................... 28
Troubleshooting Gas Control (Honeywell Millivolt Gas Valve) ................................................................. 29
Troubleshooting Gas Control (SIT 820 Millivolt Gas Valve) ..................................................................... 30
Replacement Parts Pictorial ..................................................................................................................... 32
Fan Kit - FK24 .......................................................................................................................................... 33
Bay Window Installation ........................................................................................................................... 33
Screen Kit ................................................................................................................................................. 34
Ceramic Refractory Installation ................................................................................................................ 34
Remote Control ........................................................................................................................................ 34
- 2 -
INSTALLATION AND OPERATING INSTRUCTIONS
This gas appliance should be installed by a qualified installer in
accordance with local building codes and with current CAN /
CGA-B149 (. 1 or .2) Installation codes for Gas Burning Appliances
and Equipment. or for U.S.A Installations follow local codes and/
or the current National Fuel Gas Code. ANSI Z223.1.
FOR SAFE INSTALLATION AND OPERATION OF YOUR
DIRECT VENT FIREPLACE PLEASE NOTE THE
FOLLOWING:
1 . This fireplace gives off high temperatures and should
be located out of high traffic areas and away from
furniture and draperies.
2. Children and adults should be alerted to the hazards of
the high surface temperatures of this fireplace and
should stay away to avoid burns or ignition of clothing.
3. CAUTION: Due to high glass surface temperature
children should be carefully supervised when they
are in same room as your fireplace.
4. Under no circumstances should this fireplace be modified. Parts having to be removed for servicing should
be replaced prior to operating this fireplace again.
5. Installation and any repairs to this fireplace should be
carried out by a qualified service person. A professional service person should be contacted to inspect
this fireplace annually. Make it a practice to have all
of your gas fireplaces checked annually. More
frequent cleaning may be required due to excess
lint and dust from carpeting, bedding material, etc.
IMPORTANT:
PLEASE REVIEW THE FOLLOWING
CAREFULLY
Remove any plastic from trim parts before turning
the fireplace ON.
It is normal for fireplaces fabricated of steel to give
off some expansion and/or contraction noises
during the start up or cool down cycle. Similar
noises are found with your furnace heat exchanger
or car engine.
It is not unusual for your gas fireplace to give off
some odour the first time it is burned. This is due
to the curing of the paint and any undetected oil
from the manufacturing process.
Please ensure that your room is well
ventilated - open all windows.
It is recommended that you burn your fireplace for
a least six (6) hours the first time you use it. If
optional fan kit has been installed, place fan in the
"OFF" position during this time.
LOCATING YOUR GAS FIREPLACE
6. Control compartments, burners and air passages in
this fireplace should be kept clean and free of dust and
lint. Make sure that the gas valve and pilot light are
turned off before you attempt to clean this fireplace.
7. The venting system (chimney) of this fireplace should
be checked at least once a year and if needed your
venting system should be cleaned.
8. Keep the area around your fireplace clear of combustible materials, gasoline and other flammable vapour
and liquids. This fireplace should not be used as a
drying rack for clothing, nor should Christmas stockings or decorations be hung in the area of it.
9. Under no circumstances should any solid fuels (wood,
coal, paper or cardboard etc.) be used in this fireplace.
10.The flow of combustion and ventilation air must not be
obstructed in any way.
11.Whether the fireplace is installed directly on carpeting,
vinyl tile or any combustible material other than wood,
this fireplace must be installed on a metal or wood
panel extending the full width and depth of the fireplace.
12.This fireplace requires adequate ventilation and
combustion air to operate properly.
LOCATING YOUR
INSTA-FLAME
EA
Y
Y
A) Flat on wall B) Cross corner
C) **Island D) *Room divider
E) *Flat on wall corner F) Chase installation
D
F
X
C
X
Y) 6" minimum
Note (Fig. 1):
** Island (C) and Room Divider (D) installation is possible
as long as the horizontal portion of the vent system (X)
does not exceed 20 feet (610cm). See details in Venting
Section.
* When you install your fireplace in(D) Room divider or (E)
Flat on wall corner positions (Y), a minimum of 6 inches
(153mm) clearance must be maintained from the perpendicular wall and the front of the fireplace.
- 3 -
B
X
Fig. 1
FIREPLACE DIMENSIONS
ROD
ROH
Framing Dimensions
ROW
E
G
C
D
F
A
Appliance Dimensions
H
M
B
I K
F
N
L
J
Fig. 2
BHDT36
A 36" 914mm
B 34
1/4"
870mm
C 21" 533mm
D 33" 838mm
E 24" 610mm
F 16" 406mm
1/8"
3/4"
1/4"
946mm
181mm
171mm
G 37
I7
J6
K 10" 254mm
L 13
M 39
N 55
O 28
ROD 16
ROW 36
1/2"
3/4"
1/4"
1/8"
1/2"
1/2"
343mm
1010mm
1403mm
714mm
419mm
927mm
ROH 35" 889mm
- 4 -
MANTELS
Adjustable 1/2",5/8"
& 3/4" spacing
FRAMING AND FINISHING
Depending on the width of the mantel it may be installed
higher or lower from the top of the louvre opening. See
drawing and chart below for proper installation height of
your combustible mantel piece. Non-combustible mantels
may be installed at any height above the appliance opening.
When using paint or lacquer to finish the
mantel, such paint or lacquer must be
heat resistant to prevent discolouration.
V
W
2x4
STUD
& HEADER
Maintain
minimum 1"
clearance to
combustibles
A
B
GLASS FRONT
OPTIONAL
HEARTH
C
D
LOUVRE
OPENING
X
Y
Z
E
TOP
SIDE VIEW
1. Choose fireplace location.
2. Place fireplace into position and secure to floor with
1-1/2" screws, or nails. The holes to secure the
fireplace to the floor are located just behind the
access door grill on the left and right hand side of the
fireplace.
3. Frame in fireplace with a header across the top. It is
important to allow for finished face when setting the
depth of the frame.
4. Attach fireplace to frame using adjustable frame
drywall strips(located behind access door for
shipping). Preset depth to suit facing material
(adjustable to 1/2" , 5/8" or 3/4" depths). Fig. 4.
5. Screw through slotted holes in drywall strip and
then screw into pre-drilled holes on fireplace side.
Measure from face of fireplace to face of drywall
strip to determine final depth. (Fig. 5 & 6)
ADJUSTABLE DRYWALL STRIP
C
A
(NAILING FLANGE)
B
SCREW
POSITION
DRYWALL
DEPTHS
ELECTRICAL
KNOCK-OUT
ELECTRICAL
KNOCK-OUT
BOX KNOCK-OUT
Fig. 3
MANTEL CHART
Ref. Mantel Ref. Mantel From Mantel Leg from
Depth Top Louvre Fireplace Side
V 10" (254 mm) A 12" (305 mm) 10" (254mm)
W 8" (203 mm) B 10" (254 mm) 8" (203mm)
X 6" (152 mm) C 8" (203 mm) 6" (152mm)
Y 4" (101 mm) D 6" (152 mm) 4" (101mm)
Z 2" ( 51 mm) E 4" (101 mm) 2" (51mm)
CLEARANCE TO COMBUSTIBLES
Back........ 0 mm/0 inches
Side......... 0 mm/0 inches
Floor........ 0 mm/0 inches
Top.......... 0 mm/0 inches
A
B
C
Fig. 5
1/2" / 13mm
5/8" / 16mm
3/4" / 19mm
Fig. 4
Fig. 6
FINAL FINISHING
Non-combustible materials such as brick and tile can be
extended over the face of the unit
or glass door)
. If a Trim Kit is going to be installed, brick
and tile will have to be installed flush with the side of this
appliance.
(Do not cover louvres
- 5 -
HEARTH
GAS INLET & MANIFOLD PRESSURES
Input Minimum
Input Maximum
Manifold Pressure
NATURAL
LP (Propane)
11" wc
13" wc
10" wc
4.5" wc
7" wc
3.5" wc
A hearth is not mandatory but it is recommended for
aesthetic purposes. We recommend a non-combustible
hearth which does not obstruct louvre opening.
Cold climate installation recommendation:
When installing this unit against a noninsulated exterior wall or chase, it is
mandatory that the outer walls be insulated
to conform to applicable insulation codes.
GAS SPECIFICATIONS
MAX. MIN.
MODEL FUEL GAS CONTROL B.T.U.H B.T.U.H.
BHDT36 RN Natural Gas Millivolt Hi/Lo 18,000 12,600
BHDT36 RP Propane Gas Millivolt Hi/Lo 18,000 13,500
INPUT INPUT
The installation of your Majestic Fireplace
must conform with local codes, or in the
absence of local codes, with National Fuel
Gas Code, ANSI Z223.1 latest edition, or CAN
1 B1-149.1 and .2 Installation Code.
(EXCEPTION: Do not derate this appliance
for altitude. Maintain the manifold pressure
at 3.5 inches W.C. for Natural Gas and 10
inches W.C. for LP gas.)
Do not use this fireplace if any part of it has
been under water. Immediately call a qualified
service technician to inspect the fireplace and
replace any part of the control which has been
under water.
CERTIFIED TO
ANSI Z21.88a-1998 / CSA 2.33a-M98
Vented Gas Fireplace Heaters.
- 6 -
GAS LINE INSTALLATION
PILOT
ADJ
REMOTE SWITCH INSTALLATION
When purging gas line the front glass must
be removed.
The gas pipeline can be brought in through the right side,
left side of the appliance as well as the bottom. Knockouts
are provided at convenient locations to allow for the gas
pipe installation and testing of any gas connection. It is
most convenient to bring the gas line in from the right
side, as this allows fan installation or removal without
disconnecting the gas line.
The gas line connection can be made with
properly tinned 3/8" copper tubing, 3/8"
rigid pipe or an approved flex connector.
Since some municipalities have some
additional local codes, it is always best to
consult your local authority and the CAN/
CGA-B149 (1. or .2) Installation code or for
U.S.A Installations consult the current
National Fuel Gas Code, ANSI Z223.1
Always check for gas leaks with a mild
soap and water solution. Do not use an
open flame for leak testing.
The gas control is equipped with a captured screw type
pressure test point, therefore it is not necessary to provide
a 1/8" test point up stream of the control.
1. Thread wire through the electrical knockout located on
either side of fireplace.. Do not cut wire or insulation on
metal edges. Ensure that wire is protected. Run the
other end to a conveniently located wall receptacle
box.
2. Attach wire to switch and install switch into receptacle
box. Attach cover plate to switch.
3. Connect wiring to gas valve. (Fig. 8/9)
HONEYWELL VALVE
TH
TP
TP
TH
Fig. 8
SIT VALVE
TPTH
TP
TH
P
I
L
T
O
Fig. 9
1/2" GAS SUPPLY
1/2" X 3/8" REDUCER
Typical gas supply installation
3/8" NIPPLE
3/8" X 3/8" SHUT OFF VALVE
3/8" NIPPLE
3/8" UNION
3/8" NIPPLE
Fig..7
When using copper or flex connector use only approved
fittings. Always provide a union when using black iron
pipe so that gas line can be easily disconnected for burner
or fan servicing. See Fig. 7. See gas specification for
pressure details and ratings.
The fireplace valve must not be subjected to any test
pressures exceeding 1/2 psi. Isolate or disconnect this or
any other gas appliance control from the gas line when
pressure testing.
ALTERNATE SWITCH LOCATION:
Remote switch can be installed on either side of the access
door. Simply mount the switch to the switch bracket
provided. Screw the bracket on either side of the frame,
lining up the screws with the pre-punched holes. (Fig. 10)
Fig. 10
DO NOT WIRE MILLIVOLT REMOTE WALL
SWITCH FOR GAS FIREPLACE TO A 120V
POWER SUPPLY.
FOR LIGHTING INSTRUCTIONS PLEASE
TURN TO PAGE 28.
- 7 -
GENERAL VENTING
Your fireplace is approved to be vented either through
the side wall, or vertical through the roof.
- Only Majestic venting components specifically
approved and labelled for this fireplace may be
used.
- Minimum clearances between vent pipes and
combustible materials is one (1") inch (25 mm),
except where stated otherwise.
- Venting terminals shall not be recessed into a wall
or siding.
- Horizontal venting must be installed on a level
plane without an inclining or declining slope.
D
E
V
B
L
C
Fixed
Fixed
Closed
Closed
Openable
F
V
B
V
Openable
B
V
A
Fixed
Closed
J
There must not be any obstruction such as bushes, garden
sheds, fences, decks or utility buildings within 24" from the
front of the termination hood.
Do not locate termination hood where excessive snow or
ice build up may occur. Be sure to check vent termination
area after snow falls, and clear to prevent accidental
blockage of venting system. When using snow blowers,
make sure snow is not directed towards vent termination
area.
Location of Vent Termination
It is imperative that the vent termination be located observing the minimum clearances as shown on this page.
*
Check with local codes or in absence of same with CAN/CGA
B149 (.1 or .2) Installation Codes (1991) for Canada or for U.S.A.
Installations follow the current National Fuel Gas Code, ANSI
Z223.1.
H
B
V
B
X
G
N
I
M
N
X
K
V
G
V
G
V
A
TERMINATION CAP AIR SUPPLY INLET GAS METER RESTRICTED AREA
V
X
A = clearance above grade, veranda, porch, deck, or
balcony [* 12 inches (305mm) minimum]
B = clearance to window or door that may be opened
12" (306mm).
C = clearance to permanently closed window [minimum
12 inches (305mm) recommended to prevent condensation on window]
D = vertical clearance to ventilated soffit located above
the termina/ within a horizontal distance of 24 inches
(610mm) from the centre-line of the terminal [18
inches (458mm) minimum]
E = clearance to unventilated soffit [12 inches (305mm)
minimum
F = clearance to outside comer see next page
G = clearance to inside comer see next page
H = * not to be installed above a meter/regulator assem-
bly within 36 inches (914mm) horizontally from the
centre-line of the regulator
† a vent shall not terminate directly above a side-walk or paved driveway which is located between two single family
dwellings and serves both dwellings *
‡ only permitted if veranda, porch, deck, is fully open on a minimum 2 sides beneath the floor *
* as specified in CAN/CGA B149 (.1 or .2) Installation Codes (1991) for Canada or for U.S.A. Installations follow the
current National Fuel Gas Code, ANSI Z223.1.
Note: Local codes or regulations may require different clearances.
G
(TERMINATION PROHIBITED)
I = clearance to service regulator vent outlet [*72 inches
(1828mm) minimum]
J = clearance to non-mechanical air supply inlet to
building or the combustion air inlet to any other
fireplace [ *12 inches (305mm) minimum]
K = clearance to a mechanical air supply inlet [* 72 inches
(1828mm) minimum]
L = † clearance above paved side-walk or a paved
driveway located on public property [*84 inches
(2133mm) minimum]
M = clearance under veranda, porch, deck [*12 inches
(305mm) minimum ‡]
N = Clearance above a roof shall extend a minimum of
24" (610mm) above the highest point when it passes
through the roof surface, and any other obstruciton
within a horizontal distance of 18" (450mm).
- 8 -
Termination Clearances
Termination clearances for buildings with combustible and noncombustible exteriors.
Inside Corner
Outside Corner
Recessed Location
A
V
Balcony with no side wall
G =
Combustible&
Non-Combustible
12"(305mm)
A =
Combustible
6"(152mm)
Noncombustible
2"(50mm)
G
V
B =
Combustible
6"(152mm)
V
Noncombustible
2"(50mm)
B
Balcony with perpendicular side wall
H
V
Combustible &
Non-Combustible
H = 24"(610mm)
J = 20"(508mm)
J
D
C
C
E
V
C = Maximum depth of 48"
(1219mm) for recessed
location.
D = Minimum width for back wall
of a recessed location.
Combustible 38"(965mm)
Noncombustible 24"(610mm)
E = Clearance from corner in
recessed location.
Combustible 6"(152mm)
Noncombustible 2"(50mm)
GENERAL INFORMATION ON ASSEMBLING
THE VENT PIPES WITH CRIMPED ENDS
Before joining elbows and pipes apply a bead of high temperature sealant to crimped end of elbow or pipe. (Fig.12)
Join pipes and secure joints with three (3) sheetmetal screws. (See Fig. 12) Wipe off excess sealant.
BEAD LOCATION
1" FROM CRIMPED END OF PIPE
1''
Screw Holes
Fig. 12
Fig. 11
- 9 -
GENERAL INFORMATION ON ASSEMBLING
20 ft. (6100mm)
90" (2286mm)
PIPE STRAPS
EVERY 3 ft.
(914mm)
PIPE STRAPS
EVERY 3 ft.(914mm)
FIRESTOP/ZERO
CLEARANCE SLEEVE
THE VENT PIPES WITH CRIMPED ENDS
Before joining elbows and pipes apply a bead of high
temperature sealant to crimped end of 4" and 7" elbow or
pipe. (Fig. 12)
Join pipes and secure joints with three (3) sheetmetal
screws. (See Fig. 12) Wipe off excess sealant.
BEAD LOCATION
1" FROM CRIMPED END OF PIPE
1''
Screw Holes
Fig. 12
*IMPORTANT* Minimum clearance between vent pipes
and combustible materials is one (1") inch (25 mm) on
bottom, sides and top.
Only Majestic venting components
specifically approved and labelled for
this fireplace may be used.
VERTICAL SIDEWALL APPLICATIONS
For some installations, it may be desireable
to have some amount of the horizontal vent
run immediately after the fireplace. A vertical rise must be used but can be located
anywhere in the vent system, to meet the
perimeters identified in the venting graph.
Fig. 13
The maximum number of 90 degree elbows per side wall
installation is three (3).
Vent Starter Kit 7DVSK must be used in
Vertical Sidewall installations.
Since it is very important that the venting system
maintain its balance between the combustion air intake
and the flue gas exhaust, certain limitations as to vent
configurations apply and must be strictly adhered to.
The graph showing the relationship between vertical and
horizontal side wall venting will help to determine the
various vent lengths allowable. Fig. 17.
Minimum clearance between vent pipes and
combustible materials is one (1") inch (25
mm) on top, bottom and sides unless
otherwise noted.
When vent termination exits through
foundation less than 20" below siding outcrop,
the vent pipe must flush up with the siding. A
7DVSS must also be used.
It is always best to locate the fireplace in such a way that
minimizes the number of offsets and horizontal vent
length.
The horizontal vent run refers to the total
length of vent pipe from the flue collar of the
fireplace to the face of the outer wall.
Horizontal plane means no vertical rise
exists on this portion of the vent assembly.
The maximum number of 45 degree elbows permitted per
side wall installation is two (2). These elbows can be
installed in either the vertical or horizontal run.
The maximum horizontal vent length is 36" (914mm) when
90º elbow is installed directly onto fireplace.
3 FT
(92cm)
Fig. 14
For each 45 degree elbow installed in the
horizontal run (while maintaining a constant
horizontal plane), the length of the horizontal
run MUST be reduced by 18" (457mm). This
does not apply if the 45 degree elbows are
installed on the vertical part of the vent system.
- 10 -
If a 90 degree elbow is used in the horizon-
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
eg: A
eg: B
tal vent run (level height maintained) the
maximum horizontal vent length is reduced
by 36 inches. Fig. 15. This does not apply if
the 90 degree elbows are used to increase
or redirect a vertical rise.
The maximum number of elbow degrees in a system is
270º.
Sample: 1 - 90º
2 - 45º
3 - 45º
4 - 90º
Total 270º
HOW TO USE THE VENT GRAPH
1. Determine the height of the centre of the horizontal
vent pipe exiting through the outer wall. Using this
dimension on the Sidewall Vent Graph (Fig. 17),
locate the point it intersects with the slanted graph
line.
2. From the point of this intersection, draw a vertical
line to the bottom of the graph.
3. Select the indicated dimension, and position the
fireplace in accordance with same.
EXAMPLE A:
If the vertical dimension from the floor of the unit is 11
feet (3352mm) the horizontal run to the face of the outer
wall must not exceed 14 feet (4267mm).
EXAMPLE B:
If the vertical dimension from the floor of the unit is 7 feet
(2133mm), the horizontal run to the face of the outer wall
must not exceed 8-1/2 feet (2590mm).
VERTICAL SIDEWALL VENTING GRAPH
(Dimensions in Feet)
Fig. 15
Example: According to the vent chart the maximum
horizontal vent length is 20' when the vertical height is 7.5'
from fireplace base height. If one 90 degree elbow is
required in the horizontal vent it must be reduced to 17'.
84"
90"
2134mm
90º elbow=3'
120"
3048mm
2286mm
Fig. 16
SEE PAGE 14 FOR VENTING
REQUIREMENTS FOR SNORKELS.
- 11 -
VERTICAL DIMENSION FROM THE FLOOR OF THE UNIT
TO THE CENTRE OF THE HORIZONTAL VENT PIPE
Fig. 17
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