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When installed, this gas appliance must be provided with fresh air for combustion, ventilation, and dilution of hot flue gases.
The minimum required volume of the area where the appliance is installed should be 50 cubic feet per 1,000 btu/hr.
If installed in an area of the home that is considered an unconfined space, the natural infiltration of air around windows and doors
will be adequate. If the area is considered a confined space (less than 50 cubic feet per 1,000 btu), fresh air can be supplied by
providing two permanent openings into adjoining rooms. Each opening shall have a minimum free area of one square inch per
1,000 btu per hour of the total input rating of all gas appliances in the confined space, but not less than 100 square inches. One of
the openings shall be within 12 inches of the ceiling and one within 12 inches of the floor. See Figure 1-A (on page 7).
If the home is of unusually tight construction (new and remodeled homes), free air must be supplied through opening(s) to the
outdoors. This can be accomplished by providing 2 permanent openings, one commencing within 12 inches of the ceiling and
one within 12 inches of the floor. These openings shall communicate directly with the outdoors, or spaces that communicate
freely with the outdoors, such as a ventilated attic and crawl space through galvanized or equivalent corrosion-resistant
ducts. Exception: unobstructed stud and joist spaces are acceptable ducts provided that not more than one fire block is
removed. Special provisions must be taken to insure that these stud and joist spaces cannot be blocked with insulation or
other objects. Each of these openings using vertical ducts shall have a minimum free area of one square inch per 4,000 btu/
hr of total input rating of all gas appliances. See Figure 1-B and 1-C (page 7). If horizontal ducts are used, the minimum free
area shall be one square inch per 2,000 btu/hr of total input rating of all gas appliances.
Fresh make-up air can also be provided through a duct to one permanent opening commencing within 12 inches of the
ceiling. The minimum free area of this opening shall be one square inch per 3,000 btu/hr of the total input rating of all gas
appliances but not less than the sum of the areas of all vent connectors in the space. See Figure 1-D (page 7).
When calculating the amount of fresh air needed you must include make-up air requirements for the operation of exhaust
fans, kitchen ventilation systems, clothes dryers, and fireplaces.
Additional information can be found in the latest edition of ANSI Z223.1 (National Fuel Gas Code).
All installations in the State of Massachusetts must use
the following requirements when installing, maintaining or
operating direct-vent propane or natural gas-fired space
heaters.
For direct-vent appliances, mechanical-vent heating
appliances or domestic hot water equipment, where the
bottom of the vent terminal and the air intake is installed
below four feet above grade the following requirements must
be satisfied:
1. If there is not one already present, on each floor level
where there are bedroom(s), a carbon monoxide
detector and alarm shall be placed in the living area
outside the bedroom(s). The carbon monoxide detector
shall comply with NFPA 720 (2005 Edition).
2. A carbon monoxide detector shall be located in the
room that houses the appliance or equipment
and shall:
a. Be powered by the same electrical circuit as the
appliance or equipment such that only one service
switch services both the appliance and the carbon
monoxide detector.
1017754-A
COMBUSTION AND VENTILATION AIR
INSTALLATIONS IN THE STATE OF MASSACHUSETTS
b. Have battery back-up power;
c. Meet ANSI/UL 2034 Standards and comply with NFPA
720 (2005 Edition); and
d. Have been approved and listed by a Nationally
Recognized Testing Laboratory as recognized under
527 CMR.
A CARBON MONOXIDE DETECTOR SHALL:
a. Be located in the room that houses the appliance
or equipment;
b. Be either hard-wired or battery powered or both; and
c. Shall comply with NFPA 720 (2005 Edition).
3. A product-approved vent terminal must be used, and if
applicable, a product-approved air intake must be
used. Installation shall be in strict compliance with the
manufacturer's instructions. A copy of the installation
instructions shall remain with the appliance or
equipment at the completion of the installation.
4. A metal or plastic identification plate shall be mounted
at the exterior of the building, four feet directly above
the location of vent terminal. The plate shall be of
sufficient size to be easily read from a distance of eight
feet away, and read "Gas Vent Directly Below".
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