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© 2021 United States Stove Company
REQUIREMENTS FOR THE
COMMONWEALTH OF
MASSACHUSETTS
The following requirements reference various
Massachusetts and national codes not contained
in this manual. For all sidewall 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 (7)
feet above nished grade in the area of the venting,
including but not limited to decks and porches, the
following requirements shall be satised:
INSTALLATION OF CARBON MONOXIDE
DETECTORS
At time of installation of side wall horizontally vented
gas fueled equipment, the installing plumber or
gas-tter shall 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 gas-tter shall observe that
a battery operated or hard wired carbon monoxide
detector 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 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 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 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.
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
certied.
SIGNAGE
A metal or plastic identication plate shall be
permanently mounted to the exterior of the
building at a minimum of eight (8) feet above
grade directly in line with the exhaust vent terminal
for the horizontally vented gas fueled heating the
appliance or equipment. The sign shall read, in
print no less the one-half inch (1/2”) 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 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.
EXEMPTIONS
The following equipment is exempt from 248 CMR
5.08 (2) (a) 1 through 4: 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 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 shall include:
Detailed instructions for the installation of the
venting system design or the venting system
components; and a complete parts list for the
venting system design or venting system.
GAS EQUIPMENT VENTING SYSTEM NOT
PROVIDED
When the manufacturer of Product Approved side
wall horizontally vented gas equipment does not
provide the parts for venting the ue gases, but
identies “special venting systems”, the following
requirements shall be satised by the manufacturer:
MASSACHUSETTS RESIDENTS
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