Kingsman ZVF42U, ZVF36U, ZVFB3330MVN, ZVFB3330MVP, ZVFB3633MAN Owner's Operation And Installation Manual
...
UNVENTED (VENT-FREE) FIREBOX
Circulating Models
Listed Certified for USA
ZVF33 certified to: ANSI Z21.11.2 - 2007
ZVF36U, ZVF42U and ZVF52 certified as a Universal Firebox ANSI Z21.91-2007
ZVFB3330MAN, ZVFB3330MAP, ZVFB3330MVN, ZVFB3330MVP,
ZVFB3633MAN, ZVFB3633MAP, ZVFB3633MVN, ZVFB3633MVP, ZVFB5240MVN, ZVFB5240 MVP
are approved to ANSI Z21.11.2 - 2007.
Owner’s Operation and Installation Manual
INSTALLER: Leave this manual with the appliance.
CONSUMER: Retain this manual for future reference.
Warning
Carefully review the instructions
supplied with the decorative type
unvented room heater for the
minimum size requirement.
DO NOT INSTALL THE APPLIANCE
IN THIS FIREBOX UNLESS THIS
FIREBOX MEETS THE MINIMUM
DIMENSIONS REQUIRED FOR THE
INSTALLATION
This appliance must be
installed by a licensed
plumber or gas fitter in
the Commonwealth of
Massachusetts and meet
the requirements of 527
CMR 30 and 248 CMR.
Warning
If the information in this manual is not followed
exactly, a fire or explosion my result causing property damage,
personal injury, or loss of life.
– Do not store or use gasoline or other flammable vapors and liquids in
the vicinity of this or any other appliance.
– WHAT TO DO IF YOU SMELL GAS
• Do not try to light any appliance.
• Do not touch any electrical switch; do not use any phone in your
building.
• Immediately call your gas supplier from a neighbor’s phone. Follow
the gas supplier’s instructions.
• If you cannot reach your gas supplier, call the fire department.
– Installation and service must be performed by a qualified installer,
service agency, or the gas supplier.
Warning
FOR USE ONLY WITH
A LISTED GAS-FIRED UNVENTED
DECORATIVE ROOM HEATER
NOT TO EXCEED
40,000 BTU/H.
DO NOT BUILD A WOOD FIRE
Warning
Improper installation, adjustment,
alteration, service, or maintenance
can cause injury or property
damage. Refer to this manual for
correct installation and operational
procedures. For assistance or
additional information consult a
qualified installer, service agency, or
the gas supplier.
Warning
Warning
This is an unvented gas-fired heater. It uses air (oxygen) from the
room in which installed. Provisions for adequate combustion and
ventilation must be provided. Refer to Page 13.
Save this manual for future reference • 2340 Logan Ave., Winnipeg, MB, Canada, Phone: (204) 632-1962 • Printed in Canada • PART #36VF-MAN
The ZVF33 Firebox is to be used
only with certain vent-free gas log
heaters (see table 1, Page 5). Do not
burn wood or other materials in these
fireboxes.
July 27, 2009
1
2
PRE-INSTALLATION QUESTIONS and ANSWERS
Why does my fireplace or stove give off odour?
It is normal for your fireplace to give off some odour. This is due to the curing of the paint, adhesives,
silicones and any undetected oil from the manufacturing process as well as the finishing materials used
with the installations (e.g. marble, tile and the adhesives used to adhere this product to the walls can react
with heat and cause odours).
It is recommended that you burn your gas fireplace or stove for a minimum of four hours at a time with
the fan off after the curing of the paint has been completed. These odours can last upward to 40 hours of
burn time, keep burning at a minimum of four hours per use until odours dissipate.
About curing of the paint
Your stove or fireplace has been painted with the highest quality silicone stove paint. This paint dries
quickly in 15-20 minutes when first applied at the factory. However, due to the high temperature silicone
components, the paint will cure when heat is applied to the appliance as it is first used.
The following information applies to the curing process to get the paint fully hard and durable.
Fire the appliance four successive times for 10 minutes each firing and a 5 minute cool down between
each. Be aware during log and firebox paint curing that a white deposit may be developing on the inside
of the glass doors. It is important to remove this white deposit from the glass doors with an appropriate
cleaner to prevent build-up (such as Windex or a commercial fireplace glass cleaner).
• Babies, small children, pregnant women and pets should leave the area during the cure phase.
• Ventilate well, open doors and windows.
• Do not touch during curing.
Noise coming from the fireplace?
• Noise caused by metal expanding and contracting as it heats up and cools down, similar to the sound
produced by a furnace or heating duct. This noise does not affect the operation or longevity of your
fireplace.
• Different types and thicknesses of steel will expand and contract at different rates resulting in
“cracking” and “ticking” sounds throughout the heating and cooling periods.
• You should also be aware that as temperatures change within the unit these sounds will likely reoccur. Again this is normal for steel fireboxes, and is not a defect.
Cleaning the Glass
During the first few fires, a white film may develop on the glass front, as part of the curing process. The
glass should be cleaned after the unit has cooled down or the film can bake on and become very difficult
to remove. Use a non-abrasive cleaner and do not attempt to clean the glass while it is hot.
3
TABLE OF CONTENTS
SECTION PAGE
Burner System Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
Safety Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Local Codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
For Your Safety Read Before Lighting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
Universal firebox . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
Framing Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Air for Combustion and Ventilation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
Providing Adequate Ventilation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
Determining Air Flow for Firebox Location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
Ventilation Air From Inside Building . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15
Ventilation Air From Outdoors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16
Installing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Installation Clearances . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Installing by Framing Fireplace . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Installing Firebox Using Optional Pre-Built Mantel Cabinets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Installing Gas Line . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Installing Burner Systems into Firebox . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Cleaning and Servicing of Burner / ODS Pilot . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Log Placement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22-31
Lighting Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .32
Installing Brick Panels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .33
Installation of curtain hood and optional screen door . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .33
Installation of Grill and Panel Kit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .34
Installation of Optional Fan Kit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .35
Illustrated Parts Lists . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .36-42
Accessory and Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43-45
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46-47
Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
4
BURNER SYSTEM OPTIONS
The appropriate burner system must be ordered for each specific firebox, see chart below for required burner system and firebox.
This appliance is equipped for (Natural or Propane)
Gas. Field conversion is not permitted.
TABLE 1 - The ZVF36U and ZV42U and ZVF52 are also approved as a Universal Vent Free Box. See page 8 for more information.
ZVF33 Vent Free Firebox Required burner system options: (Select from below to complete the fireplace)
Burner Model Valve Type Fuel Type BTU – Input Min/Max Inlet Manifold Pressure Orifice Size Primary Air
ZVFB3330MAN Manual Natural Gas 13,000 - 30,000 5.5”/10” 1.5” - 4.4” 39 0.187”
ZVFB3330MAP Manual Liquid Propane 22,000 - 30,000 11”/13” 8” - 10” 51 Full Open
ZVFB3330MVN Millivolt Natural Gas 13,000 - 30,000 5.5”/10” 1.6” - 3.5” 36 0.187”
ZVFB3330MVP Millivolt Liquid Propane 22,000 - 30,000 11”/13” 6.3” - 10” 52 Full Open
ZVF36U/ZVF42U Vent Free Firebox Required Burner system: (Select from below to complete the fireplace)
Burner Systems – Controls are hidden and accessed through bottom grill
ZVFB3633MAN Manual Natural Gas 22,000 - 32,000 5.5”/10” 1.5” - 4.4” 36 0.218”
ZVFB3633MAP Manual Liquid Propane 22,000 - 33,000 11”/13” 8” - 10” 50 Full Open
ZVFB3633MVN Millivolt Natural Gas 22,000 - 32,000 5.5”/10” 1.6” - 3.5” 35 0.218”
ZVFB3633MVP Millivolt Liquid Propane 22,000 - 33,000 11”/13” 6.3” - 10” 51 Full Open
ZVF52 Vent Free Firebox Required Burner system: (Select from below to complete the fireplace)
Burner Systems – Controls are hidden and accessed through bottom grill
ZVFB5240MVN Millivolt Natural Gas 25,000 - 40,000 5.5”/10” 1.6” - 3.5” 31 0.25”
ZVFB5240MVP Millivolt Liquid Propane 27,000 - 37,000 11”/13” 6.3” - 10” 50 Full Open
The GL series of gas log sets can also be used in the ZVF36U, ZVF42U and ZVF52 Universal Fireboxes
They feature the burner with grate and the controls underneath the log set inside the firebox.
(If using as a Universal box, see page 8)
GLVF24MAN Manual Natural Gas 20,000 - 35,000 5.5”/10” 1.5” - 4.4” 36 0.218”
GLVF24MAP Manual Liquid Propane 24,000 - 30,000 11”/13” 7” - 10” 50 Full Open
GLVF24MVN Millivolt Natural Gas 20,000 - 35,000 5.5”/10” 1.6” - 3.5” 34 0.218”
GLVF24MVP Millivolt Liquid Propane 24,000 - 30,000 11”/13” 6.3” - 10” 51 Full Open
36VF-106
Fibre Log Set - required for all the burners above.
LOGF18 Fibre Log Set 18” (ZVF33/36U/42U/52)
LOGF24 Fibre Log Set 24” (ZVF33/36U/42U/52)
LOGF30 Fibre Log Set 30” (ZVF52 only)
Bottom Firebox Pan – Required when GLVF24 is used with ZVF36, ZVF42 and ZVF52 or as a universal box.
5
SAFETY INFORMATION WARNINGS
WARNINGS
Important: Read this owner’s manual carefully and
completely before trying to assemble, operate, or service this
firebox. Improper use of this firebox can cause serious injury
or death from burns, fire, explosion, electrical shock, and
carbon monoxide poisoning.
Early signs of carbon monoxide poisoning resemble the
flu, with headaches, dizziness, and / or nausea. If you have
these signs, the heater may not be working properly. Get
fresh air at once! Turn off gas appliance. Have appliance
serviced. Some people (such as pregnant women, persons
with heart or lung disease, persons with anemia and those at
high altitudes) are more affected by carbon monoxide than
others. Make certain you read and understand all warnings.
This appliance is equipped for (Natural or
Propane) Gas. Field conversion is not permitted.
Warning: Failure to position parts in accordance with
these diagrams or failure to use only part specifically
approved with this heater may result in property
damages or personal injury.
1. Use correct gas type for your appliance. Do not convert
from one gas type to another.
2. If this appliance is for use with Propane gas, do not
place propane supply tank(s) inside any structure.
Locate propane supply tank(s) outdoors.
3. If you smell gas:
– Shut off gas supply.
– Do not try to light any appliance.
– Do not touch any electrical switch; do not use any
phone in your building.
– Immediately call your gas supplier from a neighbor’s
phone. Follow the gas supplier’s instructions.
– If you cannot reach your gas supplier, call the fire
department.
4. Do not use this appliance for burning trash or cooking.
Never place matches, paper, garbage, or any other
material on top of logs or logs into flame.
5. Warning: Always operate appliance with front fireplace
screens closed.
6. Make sure any safety screen or guard removed for
servicing is in place before running appliance.
7. Never run appliance in a small, closed room. Open the
door into next room to help ventilate.
8. If appliance shuts off, do not relight until you provide
fresh outside air. If appliance keeps shutting off, have it
serviced.
DANGER
CARBON MONOXIDE POISONING
MAY LEAD TO DEATH!
NOTE: It is recommended that a Carbon Monoxide (CO)
Detector be installed in or near bedrooms and on all levels
of your home. Place a detector about 15 feet (4.5 meters)
outside the room that houses your gas appliance.
9. Do not run appliance:
– where flammable liquids or vapors are used or stored.
– under dusty conditions.
10. Surface of appliance becomes very hot when operating.
Keep children and adults away from hot surface.
Appliance will remain hot for some time after shutdown.
Allow surface to cool before touching.
11. Do not use this appliance if any part has been
submerged under water. Immediately call a qualified
technician to inspect the appliance and to replace any
part of the control system and gas control which has
been under water.
12. The installation must conform with local codes or, in the
absence of local codes, with the National Fuel Gas
Code, ANSI Z223.1.
13. Never install the appliance:
– in a bedroom, bathroom, mobile home, or recreational
vehicle.
– where curtains, furniture, clothing, or other flammable
objects are less than forty-two inches (42”) from the
front
of the appliance.
– in high traffic areas.
– in windy or drafty areas.
14. Disconnect the appliance and its individual shut off
valve from the gas supply piping system during any
pressure testing of that system at test pressures in excess
of 1/2 psig, (3.5kPa).
15. Isolate the appliance from the gas supply piping system
by closing its individual manual shut off valve during
any
pressure testing of the the gas supply piping system at
test pressure equal or less than 1/2 psig.
16. Do not use any type of after-market blower that fits
inside the fireplace. Drafts created by these type of
blowers may cause sooting.
6
SAFETY INFORMATION WARNINGS Cont.
17. Turn off appliance and let cool before servicing. Only a
qualified service person should install, service and repair
appliance.
18. Inspect the appliance before use and at least annually by
a professional service person. Frequent cleaning may be
required due to excessive lint from carpeting, bedding
material, etc. It is important that control compartment,
burner and circulating air passage of the appliance be
kept open.
19. When operated for the first time, there will be some
smell from the appliance. This will diminish and
disappear after a few hours of operation.
20. Warning: Do not allow fans to blow directly into the
fireplace. Avoid any drafts that alter flame patterns.
21. Warning: Do not use a blower insert, heat exchanger
insert or other accessory not approved for use with this
heater.
LOCAL CODES
Install and use fireplace with care. Follow all local codes. In
the absence of local codes, use the latest edition of The
National Fuel Gas Code ANSI Z223.1, also known as NFPA
54*. Firebox must be electrically grounded in accordance
with the National Electrical Code, ANSI/NFPA 70 (latest
edition).
22. The firebox canopy must not be replaced with a canopy
which may be provided with the decorative type
UNVENTED room heater.
23. Warning: Do not operate ceiling fans in same room as
the vent free appliance.
24. Must be installed by a licensed gasfitter in the
Commonwealth of Massachusetts. Complies to code
527CMR.
25. Unvented gas fired appliances may be used only for
supplemental heat and/or decorative purposes and under
no circumstances shall they provide a primary heat
source.
WARNING
If you do not follow these instructions exactly, a fire or
explosion may result causing property damage, personal
injury or loss of life.
*Available from:
American National Standards Institute, Inc. National Fire Protection Association, Inc.
1430 Broadway BatterymarchPark
New York, NY 10018 Quincy, MA 02260
FOR YOUR SAFETY READ BEFORE LIGHTING
A. This appliance has a pilot which must be lighted by hand. When lighting the pilot, follow these instructions exactly.
B. Before lighting, smell all around the appliance area for gas. Be sure to smell next to the floor because some gas is
heavier than air and will settle on the floor.
What to do if you smell gas
• Do not try to light any appliance.
• Do not touch any electric switch; do not use any phone in your building.
• Immediately call your gas supplier from a neighbor’s phone. Follow the gas supplier’s instructions.
• If you cannot reach your gas supplier, call the fire department.
C. Use only your hand to push in or turn the gas control knob. Never use tools. If the knob will not push in or turn by hand,
don’t try to repair it, call a qualified service technician or gas supplier. Force or attempted repair may result in a fire or
explosion.
D. Do not use this appliance if any part has been under water. Immediately call a qualified service technician to inspect the
appliance and to replace any part of the control system and any gas control which has been under water.
7
UNIVERSAL FIREBOX
The ZVF36U, ZVF42U and ZVF52 are approved as a Zero Clearance Universal Firebox.
When installing another manufacturer’s log and burner system, follow the manufacturer’s assembly instructions.
For framing, see page 10 for ZVF36U Firebox or page 11 for ZVF42U Firebox and page 12 for ZVF52 Firebox. Follow all
clearances to combustibles in this manual
When using the optional blower kit (Z33FK) in conjunction with the bottom tray (36VF-106) the two leads from the blower
that attach to the thermodisc must be attached together and the thermodisc can be discarded. See page 35 for wiring.
The fireplace hood is packaged on top of the firebox from the factory. It must be installed on the firebox before operation of the
appliance.
The firebox hood must not be replaced with a hood which may be provided with the decorative type unvented room heater.
USE ONLY KINGSMAN DECORATIVE COMPONENT AND REPLACEMENT PARTS.
Firebox # Firebox Width Front Firebox Width Back Firebox Depth Firebox Max BTU
ZVF36U 29” 22 1/2” 15” 40,000
ZVF42U 33 3/8” 26 3/8” 15” 40,000
ZVF52 41 1/2” 30 3/8” 17 1/2” 40,000
8
FRAMING SPECIFICATIONS
ZVF33 FIREPLACE AND FRAMING DIMENSIONS
Framing Clearances to Fireplace:
Bottom – 0 / Sides – 0 to standoffs / Top – 0 to standoffs / Adjacent side wall – 6” / Front of fireplace to ceiling – 41”.
FIGURE 1 – ZVF33
9
FRAMING SPECIFICATIONS Cont.
ZVF36U FIREPLACE AND FRAMING DIMENSIONS
36”
36”
17”
33 7/8”
33 7/8”
GAS LOCATION
ON LEFT SIDE OF
UNIT
0.5”
for gyprock
facing
34”
7 1/2” MANUAL VALVE
5 11/16” MILLIVOLT VALVE
3 5/8” MANUAL
17”
17”
4 3/16” MILLIVOLT
34”
36 3/8”
Framing Clearances to Fireplace:
Bottom – 0 / Sides – 0 to standoffs / Top – 0 to standoffs / Adjacent side wall – 6” / Front of fireplace to ceiling – 41”.
FIGURE 2 – ZVF36U
17”
28 7/16”
NAILING TABS
10
10 1/4”
36”
36 3/8”
40 3/16”
10 1/4”
FRAMING SPECIFICATIONS Cont.
ZVF42U FIREPLACE AND FRAMING DIMENSIONS
42”
42”
17”
36”
GAS LOCATION
ON LEFT SIDE
OF UNIT
1/2”
for gyprock
facing
36”
36 1/4”
17”
7 1/2” MANUAL VALVE
5 11/16” MILLIVOLT VALVE
3 5/8” MANUAL
4 3/16” MILLIVOLT
17”
36 1/4”
42 3/8”
Framing Clearances to Fireplace:
Bottom – 0 / Sides – 0 to standoffs / Top – 0 to standoffs / Adjacent side wall – 6” / Front of fireplace to ceiling – 41”.
FIGURE 3 – ZVF42U
17”
30 11/16”
NAILING TABS
11
9 1/2”
43 3/8”
42”
9 1/2”
42 3/8”
61 5/16”
FRAMING SPECIFICATIONS
ZVF52 FIREPLACE AND FRAMING DIMENSIONS
INSTALL GAS LINE
FROM THIS SIDE
52.000”
FLAME PATTERN
20.898”
GAS LINE LOCATED ON
OPPOSITE SIDE AS SHOWN
44.0”
48.061”
44.375”
44.500”
5.062
6.250”
20.898”
Minimum
enclosure
height
20.898”
.500”
Gyprock facing
21.398”
62.276”
Nailing
tabs
17.558”
44.500”
52.250”
Gyprock
INSULATION
20.898”
44.389”
17.558”
52.0”
52.250”
87.365”
Framing Clearances to Fireplace:
Bottom – 0” / Sides – 0” to standoffs / Top – 0” to standoffs / Adjacent side wall – 6” / Front of fireplace to ceiling – 41”.
FIGURE 4 – ZVF52
12
AIR FOR COMBUSTION AND VENTILATION
Today’s homes are built more energy efficient than ever. New materials, increased insulation, and new construction methods
help reduce heat loss in homes. Home owners weather strip and caulk around windows and doors to keep the cold air out
and the warm air in. During heating months, home owners want their homes as airtight as possible.
While it is good to make your home energy
WARNING
This firebox shall not be installed in a confined space
unless provisions are provided for adequate combustion
and ventilation air. Read the following instructions to
insure proper fresh air for this and other fuel-burning
appliances in your home.
PROVIDING ADEQUATE VENTILATION
The following are excerpts from National Fuel Gas Code. NFPA 54/ANSI Z223.1, Section 5.3, Air for Combustion and
Ventilation:
All spaces in homes fall into one of the three following ventilation classifications:
1. Unusually Tight Construction, 2. Unconfined Space, 3. Confined Space.
efficient, your home needs to breathe. Fresh air must enter
your home. All fuel-burning appliances need fresh air for
proper combustion and ventilation.
Exhaust fans, fireboxes, clothes dryers, and fuel burning
appliances draw air from the house to operate. You must
provide adequate fresh air for these appliances. This will
insure proper venting of vented fuel-burning appliances.
The information on pages 14 through 16 will help you classify your space and provide adequate ventilation.
Unusually Tight Construction
The air that leaks around doors and windows may provide enough fresh air for combustion and ventilation. However, in
building of usually tight construction, you must provide additional fresh air.
Unusually tight construction is defined as construction where:
a. walls and ceilings exposed to the outside atmosphere have a continuous water vapor retarder with a rating of one
perm (6 x 10-11 per pasec-m2) or less with openings gasketed or sealed and
b. weather stripping has been added on openable windows and doors and
c. caulking or sealants are applied to areas such as joints around window and door frames, between sole plates and
floors, between wall-ceiling joints, between wall panels, at penetrations for plumbing, electrical, and gas lines, and
at other openings.
If your home meets all of the three criteria above, you must provide additional fresh air.
See Ventilation Air From Outdoors, page 16.
Confined and Unconfined Space
The National Fuel Gas Code (ANSI Z223.1, 1992 Section 5.3) defines a confined space as a space whose volume is less than
50 cubic feet per 1,000 btu per hour (4.8 m3 per kw) of the aggregate input rating of all appliances installed in that space.
Rooms communicating directly with the space in which the appliances are installed*, through openings not furnished with
doors, are considered a part of the unconfined space.
*Adjoining rooms are communicating only if there are doorless passageways or ventilation grills between them.
DETERMINING AIR FLOW FOR FIREBOX LOCATION
Determining if You Have a Confined or Unconfined Space
Use the work sheet on the next page to determine if you have a confined or unconfined space.
Space: Includes the room in which you will install firebox plus any adjoining rooms with doorless
passageways or ventilation grills between the rooms.
13
AIR FOR COMBUSTION AND VENTILATION Cont.
1. Determine the volume of the space (length x width x height).
Length x Width x Height = ______________ cu. ft. (volume of space)
Example: Space size 22ft. (length) x 18 ft. (width) x 8 ft. (ceiling height) = 3168 cu. ft. (volume of space)
If additional ventilation to adjoining room is supplied with grills or openings, add the volume of these rooms to the total
volume of the space.
2. Divide the space volume by 50 cubic feet to determine the maximum Btu/Hr the space can support.
______________ (volume of space) ÷ 50 cu. ft. = 63.3 or 63,300 (maximum Btu/Hr the space can support)
3. Add the Btu/Hr of all fuel burning appliances in the space.
Vent-free firebox __________________ Btu/Hr
Gas water heater* __________________ Btu/Hr
Gas furnace __________________ Btu/Hr
Vented gas heater __________________ Btu/Hr
Gas firebox logs __________________ Btu/Hr
Other gas appliances* + __________________ Btu/Hr
Total = __________________ Btu/Hr
Example: Gas water heater 40,000 Btu/Hr
Vent-free firebox with log heater + 39,000 Btu/Hr
Total = 79,000Btu/Hr
* Do not include direct-vent gas appliances. Direct-vent draws combustion air from the outdoors and vents to the
outdoors.
4. Compare the maximum Btu/Hr the space can support with the actual amount of Btu/Hr used.
__________________ Btu/Hr (maximum the space can support)
__________________ Btu/Hr (actual amount of Btu/Hr used)
Example: 63,300 Btu/Hr (maximum the space can support)
79,000 Btu/Hr (actual amount of Btu/Hr used)
The space in the above example is a confined space because the actual Btu/Hr used is more than the maximum Btu/Hr the
space can support. You must provide additional fresh air. Your options are a follows:
A. Rework work sheet, adding the space of an adjoining room. If the extra space provides and unconfined space, remove
door to adjoining room or add ventilation grills between rooms, See Ventilation Air from Inside Building, page 15.
B. Vent room directly to the outdoors. See ventilation Air
from Outdoors, page 16.
WARNING
C. Install a lower Btu/Hr firebox, if lower Btu/Hr size
makes room unconfined.
If the actual Btu/Hr used is less than the maximum Btu/Hr
the space can support, the space is an unconfined fined
space. You will need no additional fresh air ventilation.
If the area in which the firebox and gas log heater may be
operated is smaller than that defined as an unconfined
space, provide adequate combustion and ventilation air by
one of the methods described in the National Fuel Gas
Code, ANSI Z223.1, 1992, Section 5.3.
14
AIR FOR COMBUSTION AND VENTILATION Cont.
VENTILATION AIR FROM INSIDE BUILDING
This fresh air would come from an adjoining unconfined space. When ventilating to an adjoining unconfined space, you
must provide two permanent openings: one within 12” of the ceiling and one within 12” of the floor on the wall connecting
the two spaces. You can also remove door into adjoining
room. Follow the National Fuel Gas Code NFPA 54/ANSI
Z223.1, Section 5.3, Air for Combustion and Ventilation for
required size of ventilation grills or ducts.
Rework worksheet, adding the space of the adjoining
unconfined space. The combined spaces must have
enough fresh air to supply all appliances in both spaces.
WARNING
FIGURE 5 - Ventilation Air from Inside Building
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