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Commonwealth of Massachusetts
State of Massachusetts Carbon Monoxide
Detector/Vent Terminal Signage
Requirements
For all side wall horizontally vented gas fueled equipment
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 fi nished grade in the area of the venting,
including but not limited to decks and porches, the
following requirements shall be satisfi ed:
1. INSTALLATION OF CARBON MONOXIDE DETECTORS. At
the time of installation of the side wall horizontal vented
gas fueled equipment, the installing plumber or gas fi tter
shall observe that a hard wired carbon monoxide detector
with an alarm and battery back-up is installed on the
fl oor level where the gas equipment is to be installed. In
addition, the installing plumber or gas fi tter shall 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
side wall horizontal vented gas fueled equipment. It shall
be the responsibility of the property owner to secure
the services of qualifi ed licensed professionals for the
installation of hard wired carbon monoxide detectors.
a. 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
fl oor level.
b. In the event that the requirements of this subdivision
can not be met at the time of completion of installation,
the owner shall have a period of thirty (30) days to comply
with the above requirements; provided, however, that
during said thirty (30) day period, a battery operated
carbon monoxide detector with an alarm shall be
installed.
2. APPROVED CARBON MONOXIDE DETECTORS. Each
carbon monoxide detector as required in accordance with
the above provisions shall comply with NFPA 720 and be
ANSI/UL 2034 listed and IAS certifi ed.
3. SIGNAGE. A metal or plastic identifi cation plate shall 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 shall read, in print size no less than one-half (1/2) inch
in size, "GAS VENT DIRECTLY BELOW. KEEP CLEAR OF ALL
OBSTRUCTIONS".
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4. INSPECTION. The state or local gas inspector of the
side wall horizontally vented gas fueled equipment shall
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.
(b) 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.
(c) 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 shall 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.
(d) 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 fl ue gases, but identifi es "special venting
systems", the following requirements shall be satisfi ed by
the manufacturer:
1. The referenced "special venting system" instructions
shall be included with the appliance or equipment
installation instructions; and
2. The "special venting systems" shall be Product
Approved by the Board, and the instructions for that
system shall include a parts list and detailed installation
instructions.
(e) 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
shall remain with the appliance or equipment at the
completion of the installation.
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