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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 satisfi ed:
a.) A carbon monoxide (CO) detector and alarm

shall be placed on each fl oor 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 identifi cation plate shall be

mounted at the exterior of the building, 4 feet directly
above the location of vent terminal. The plate shall
be of suffi cient 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 satisfi ed:
a.)

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

fl oor 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,

Additional 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), 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 Contractors

National Association (SMACNA), or American Society of Heating,

Refrigeration, and Air Conditioning Engineers (ASHRAE)

Fundamentals Handbook

Electrical Connections