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Special Installation Requirements for Massachusetts
A. For all sidewall horizontally vented gas fueled equipment installed in every dwelling, building or structure used in
whole or in part for residential purposes and where the sidewall exhaust vent termination is less than seven (7)
feet above grade, the following requirements shall be satisfied:
1. If there is no carbon monoxide detector with an alarm already installed in compliance with the most current
edition of NFPA 720, NFPA 70 and the Massachusetts State Building Code in the residential unit served
by the sidewall horizontally vented gas fueled equipment, a battery operated carbon monoxide detector
with an alarm shall be installed in compliance with the most current edition of NFPA 720, NFPA 70 and the
Massachusetts State Building Code.
2. In addition to the above requirements, if there is not one already present, a carbon monoxide detector with an
alarm and a battery back-up shall be installed and located in accordance with the installation requirements
supplied with the detector on the floor level where the gas equipment is installed. The carbon monoxide
detector with an alarm shall comply with 527 CMR, ANSI/UL 2034 Standards or CSA 6.19 and the most
current edition of NFPA 720. In the event that the requirements of this subdivision can not be met at the time
of the completion of the installation of the equipment, the installer shall have a period of thirty (30) days to
comply with this requirement; provided, however, that during said thirty (30) day period, a battery operated
carbon monoxide detector with an alarm shall be installed in compliance with the most current edition of
NFPA 720, NFPA 70 and the Massachusetts State Building Code. In the event that the sidewall horizontally
vented gas fueled equipment is installed in a crawl space or an attic, the carbon monoxide detector may
be installed on the next adjacent habitable floor level. Such detector may be a battery operated carbon
monoxide detector with an alarm and shall be installed in compliance with the most current edition of NFPA
720, NFPA 70 and the Massachusetts State Building Code.
3. 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. A final inspection by the state or local gas inspector of the sidewall horizontally vented equipment shall not be
performed until proof is provided that the state or local electrical inspector having jurisdiction has granted a
permit for installation of carbon monoxide detectors and alarms as required above.
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 sidewall 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. When the manufacturer of Product Approved sidewall horizontally vented gas equipment provides a venting
system design or venting system components with the equipment, the instructions for installation of the
equipment and the venting system shall include:
1. A complete parts list for the venting system design or venting system; and
2. Detailed instructions for the installation of the venting system design or the venting system components.
D. When the manufacturer of a Product Approved sidewall horizontally vented gas fueled equipment does not
provide the parts for venting flue gases, but identifies "special venting systems", the following shall be satisfied:
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 sidewall 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.
106308-05 - 3/23
APEX
Installation, Operating, & Service Instructions
3
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