GENERAL INFORMATION
4
Important: Carbon Monoxide Detectors
Many jurisdictions require the installation of carbon monoxide detectors in building where a side wall vented fuel burning
appliance is installed. Installers must abide by local code requirements regarding the installation of CO detectors. The use of
a certified carbon monoxide detector is recommended but not required by FLOWMAX.
“In the State of Massachusetts only”
(a)For all horizontally vented gas fuelled equipment installed in every dwelling, building or structure used in whole or in part
for residential purposes, including those owned and 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 DETECTORS. At the time of installation of the side wall horizontal
vented gas fuelled equipment, the installing plumber or gas fitter 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 and on each additional level of the dwelling, building or structure served by the equipment. It
shall be the responsibility of the property owner to secure the services of qualified licensed professionals for the
installation of hard wired carbon monoxide detectors.
a. In the event that the side wall horizontally vented gas fuelled 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 cannot be met at the time of completion of
installation, the owner shall have a period of 30 days to comply with the above requirements; provided,
however, that during said 30 day period a battery operated carbon monoxide detector with 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 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 fuelled 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 fuelled 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.
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