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For all side wall terminated, horizontally vented power vent, direct vent, and power direct vent gas fueled water heaters installed
in every dwelling, building or structure used in whole or in part for residential purposes, including those owned or operated by
the Commonwealth and where the side wall exhaust vent termination is less than seven (7) feet above nished grade in the
area of the venting, including but not limited to decks and porches, the following requirements should be satised:
INSTALLATION OF CARBON MONOXIDE DETECTORS At the time of installation of the side wall horizontal vented gas fueled
equipment, the installing plumber or gastter should observe that a hard wired carbon monoxide detector with an alarm and battery
back-up is installed on the oor level where the gas equipment is to be installed. In addition, the installing plumber or gastter should
observe that a battery operated or hard wired carbon monoxide detector with an alarm is installed on each additional level of the dwelling,
building or structure served by the sidewall horizontal vented gas fueled equipment. It should be the responsibility of the property owner
to secure the services of qualied licensed professionals for the installation of hard wired carbon monoxide detectors.
In the event that the side wall horizontally vented gas fueled equipment is installed in a crawl space or an attic, the hard wired
carbon monoxide detector with alarm and battery back-up may be installed on the next adjacent oor level.
In the event that the requirements of this subdivision can not be met at the time of completion of installation, the owner should
have a period of thirty (30) days to comply with the above requirements provided that during said thirty (30) day period, a battery
operated carbon monoxide detector with an alarm should be installed.
APPROVED CARBON MONOXIDE DETECTORS Each carbon monoxide detector as required in accordance with the above
provisions should comply with NFPA 720 and be ANSI/UL 2034 listed and CSA certied.
SIGNAGE A metal or plastic identication plate should be permanently mounted to the exterior of the building at a minimum
height of eight (8) feet above grade directly in line with the exhaust vent terminal for the horizontally vented gas fueled heating
appliance or equipment. The sign should read, in print size no less than one-half (1/2) inch in size, “GAS VENT DIRECTLY
BELOW. KEEP CLEAR OF ALL OBSTRUCTIONS.”
INSPECTION The state or local gas inspector of the side wall horizontally vented gas fueled equipment should not approve
the installation unless, upon inspection, the inspector observes carbon monoxide detectors and signage installed in accordance
with the provisions of 248 CMR 5.08(2)(a) 1 through 4.
EXEMPTIONS: The following equipment is exempt from 248 CMR 5.08(2)(a)1 through 4:
1. The equipment listed in Chapter 10 entitled “Equipment Not Required To Be Vented” in the most current edition of NFPA 54
as adopted by the Board; and
2. Product Approved side wall horizontally vented gas fueled equipment installed in a room or structure separate from the
dwelling, building, or structure used in whole or in part for residential purposes.
MANUFACTURER REQUIREMENTS - GAS EQUIPMENT VENTING SYSTEM PROVIDED When the manufacturer of Product
Approved side wall horizontally vented gas equipment provides a venting system design or venting system components with the equipment,
the instructions provided by the manufacturer for installation of the equipment and the venting system should include:
1. Detailed instructions for the installation of the venting system design or the venting system components; and
2. A complete parts list for the venting system design or venting system.
MANUFACTURER REQUIREMENTS - GAS EQUIPMENT VENTING SYSTEM NOT PROVIDED When the manufacturer
of a Product Approved side wall horizontally vented gas fueled equipment does not provide the parts for venting the ue
gases, but identies “special venting systems,” the following requirements should be satised by the manufacturer:
1. The referenced “special venting system” instructions should be included with the appliance or equipment installation instructions; and
2. The “special venting systems” should be Product Approved by the Board, and the instructions for that system should include
a parts list and detailed installation instructions.
A copy of all installation instructions for all Product Approved side wall horizontally vented gas fueled equipment, all venting
instructions, all parts lists for venting instructions, and/or all venting design instructions should remain with the appliance or
equipment at the completion of the installation.
INSTALLATION REQUIREMENTS FOR THE COMMONWEALTH OF MASSACHUSETTS