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Installation instructions
15
The masonry chimney may have to be tile or metal lined
before the insertion of the gas vent pipe; check local
codes for clarification. You may not vent any other fuel
burning appliances into any free space remaining in the
chimney. The vent terminator must extend at least 3 feet
(0.9 m) above where the chimney meets the roofline and
at least 2 feet (0.6 m) higher than any vertical wall or
similar obstruction within 10 feet (3.1 m). The top of the
chimney must be sealed to prevent rain water or other
elements from entering the chimney.
Exterior masonry chimneys
Refer to the National Fuel Gas Code and consult a local
venting HVAC contractor. Not recommended in cold
climates.
3.6.6 Horizontal terminations
• For horizontal vent runs less than 5 linear feet, the
entire vent run must pitch down to termination 1/4"
per foot to eliminate the danger of rain from entering
the venting system.
• The exhaust vent must terminate immediately once it
penetrates the outside wall.
• An approved vent terminator must be used. See
Table 4 for known approved horizontal vent
terminations.
• Install an additional condensate drain (not supplied)
if the total straight vent length is greater than 5 feet
or if the exhaust vent pipe passes through an
unconditioned space.
• Terminating the intake air piping above the exhaust
termination is not recommended.
• Fig. 17 and table 6 show the required clearances for
the vent termination. Follow local codes if more
stringent.
3.6.6.1 Attention residents of the Commonwealth
of Massachusetts:
In the Commonwealth of Massachusetts the following
regulation went into effect on 12/30/2005:
(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, includ-
ing 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 hor-
izontal 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 observe that a battery oper-
ated or hard wired carbon monoxide detector with an
alarm is installed on each additional level of the dwell-
ing, building or structure served by the side wall hor-
izontal 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 at tic, 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 subdivi-
sion 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.
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 build-
ing 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 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 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) MANUFACTURERS REQUIREMENTS - GAS
EQUIPMENT VENTING SYSTEM REQUIRED.
When the manufacturer of Product Approved side
wall horizontally mounted gas equipment provides a
venting system design or venting system compo-
nents with the equipment, the instructions provided
by the manufacturer for the installation of the equip-
ment and the venting shall include: