8
COMMONWEALTH OF MASSACHUSETTS NOTE
IMPORTANT! THE COMMONWEALTH OF MASSACHU-
SETTS REQUIRES COMPLIANCE WITH REGULATION
248 CMR 4.00 AND 5.00 FOR INSTALLATION OF
THROUGH-THE-WALL VENTED GAS APPLIANCES AS
FOLLOWS:
(a) For all side wall horizontally vented gas fueled equip-
ment 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 finished grade in the area of the
venting, including but not limited to decks and porches,
the following requirements shall be satisfied:
1. INSTALLATION OF CARBON MONOXIDE DETEC-
TORS.
At the time of installation of the side wall horizontal
vented gas fueled equipment, the installing plumber or
gasfitter shall observe that a hard wired carbon monoxide
detector with an alarm and battery back-up is installed on
the floor level where the gas equipment is to be installed.
In addition, the installing plumber or gasfitter shall ob-
serve that a battery operated or hard wired carbon
monoxide detector with an alarm is installed on each ad-
ditional 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 qualified licensed professionals for the in-
stallation 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 floor
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 dur-
ing 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 accor-
dance with the above provisions shall comply with NFPA
720 and be ANSI/UL 2034 listed and IAS certified.
3. SIGNAGE.
A metal or plastic identification 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”.
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 sig-
nage 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 fu-
eled 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 EQUIP-
MENT VENTING SYSTEM PROVIDED. When the manu-
facturer of Product Approved side wall horizontally vented
gas equipment provides a venting system design or vent-
ing system components with the equipment, the instruc-
tions 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 EQUIP-
MENT 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 flue gases, but identifies “special venting
systems”, the following requirements shall be satisfied by
the manufacturer:
1. The referenced “special venting system” instructions
shall be included with the appliance or equipment installa-
tion instructions; and
2. The “special venting systems” shall be Product Ap-
proved by the Board, and the instructions for that system
shall include a parts list and detailed installation instruc-
tions.
(e) A copy of all installation instructions for all Product Ap-
proved side wall horizontally vented gas fueled equip-
ment, all venting instructions, all parts lists for venting
instructions, and/or all venting design instructions shall re-
main with the appliance or equipment at the completion of
the installation.
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