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23
E: Special Requirements For Side-Wall Vented Appliances
In The Commonwealth of Massachusetts
IMPORTANT
The Commonwealth of Massachusetts requires compliance with regulation 248 CMR 4.00 and 5.00 for
installation of side-wall vented gas appliances as follows:
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 satised:
a. If there is not already one present, on each oor 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).
b. A carbon monoxide detector shall be located in the room that houses the appliance or equipment
and shall:
i. 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;
ii. Have battery back-up power;
iii. Meet ANSI/UL 2034 Standards and comply with NFPA 720 (2005 Edition); and
iv. Have been 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 identication plate shall be mounted at the exterior of the building, four feet
directly above the location of the vent terminal. The plate shall be of sufcient size to be 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 satised:
a. If there is not already one present, on each oor 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).
b. A carbon monoxide detector shall :
i. Be located in the room that houses the appliance or equipment
ii. Be either hard-wired or battery powered or both; and
iii. Comply with NFPA 720 (2005 Edition)
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.