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1. 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:

a.) A carbon monoxide (CO) detector and alarm shall be

placed on each floor level where there are bedrooms.
The detector shall comply with NFPA 720 (2005
Edition) and be mounted in the living area outside
the bedroom(s).

b.) A (CO) detector shall be located in the room that

houses the appliance or equipment and shall:

• Be powered by the same electrical circuit as the

appliance or equipment. Only one service switch
shall power the appliance and the (CO) detector;

• Have battery back-up power;
• Meet ANSI/UL 2034 Standards and comply with

NFPA 720 (2005 Edition); and Approved and listed
by a Nationally Recognized Testing Laboratory as
recognized under 527 CMR.

c.) 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.

d.) A metal or plastic identification plate shall be mounted

at the exterior of the building, 4 feet directly above
the location of vent terminal. The plate shall be of
sufficient size, easily read from a distance of eight
feet away, and read “Gas Vent Directly Below”.

2. 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
above four feet above grade the following requirements
must be satisfied:

a.) A (CO) detector and alarm shall be placed on each

floor level where there are bedrooms. The detector
shall comply with NFPA 720 (2005 Edition) and be
mounted in the living area outside the bedroom(s).

b.) The (CO) detector shall:

• Be located in the room that houses the appliance

or equipment;

• Be hard-wired, battery powered or both.
• Shall comply with NFPA 720 (2005 Edition).

c.) A product-approved vent terminal must be used,

The information listed below is for reference purposes only
and does not necessarily have jurisdiction over local or state
codes. Always consult with local authorities before installing
any gas appliance.

Combustion & Ventilation Air

• US: National Fuel Gas Code (NFGC/ NFPA-54), Air for

Combustion and Ventilation

• CANADA: Natural Gas and Propane Installation Codes

(NSCNGPIC), Venting Systems and Air Supply for

Appliances

Duct Systems

• US and CANADA: Air Conditioning Contractors Association

(ACCA) Manual D, Sheet Metal and Air Conditioning -

National Association (SMACNA), or American Society of

Heating, Refrigeration, and Air Conditioning Engineers

(ASHRAE) Fundamentals Handbook