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enter the building through doors, windows, gravity
inlets or other openings. Whenever possible,
locations under windows or near doors should be
avoided.
4. Locate the vent terminal so that it cannot be
blocked by snow. The installer may determine that
a vent terminal must be higher than the minimum
shown in codes, depending upon local conditions.
5. Locate the terminal so the vent exhaust does not
settle on building surfaces or other nearby objects.
Vent products may damage such surfaces or
objects.
6. If the boiler or water heater uses ducted
combustion air from an intake terminal located on
the same wall, locate the vent terminal at least 3
feet (0.9m) horizontally from the combustion air
terminal, and locate the vent terminal at least 1
foot (0.3m) above the combustion air terminal
WARNING
The outdoor vent terminal gets hot. Unit must
be installed in such a way as to reduce the risk
of burns from contact with the vent terminal.
AVERTISSEMENT
La sortie d'évent à l'extérieur devient très
chaude. Elle doit être installée de façon à
réduire le risque de brûlures au contact de
l'extrémité de l'évent.
Important Note: Massachusetts Code
Requirement.
From Massachusetts Rules and Regulations 248
CMR 5.08:
(a) 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 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 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
LAARS Heating Systems
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 qualified 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 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 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 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 (½) 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 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 horizontal 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.
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