Instruction manual
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NOTICE! 
Commonwealth of Massachusetts
 Installation Requirements  MACODE-3
   In the Commonwealth of Massachusetts, the installa-
tion must be performed by a licensed plumber or gas 
 tter.
1.  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  nished grade, 
in the area of the venting, including but not limited to decks and 
porches, the following requirements shall be satis ed:
  d.   INSTALLATION OF CARBON MONOXIDE DETECTORS. At the 
time of installation of the side wall horizontal 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 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 quali ed 
licensed professionals for the installation of hard wired 
carbon monoxide detectors.
  i.   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 
 oor level.
  ii.  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.
  e.  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 certi ed. 
  f.   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 (1/2) inch in size, “GAS VENT 
DIRECTLY BELOW. KEEP CLEAR OF ALL OBSTRUCTIONS”.
  g.  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. 
  Improper venting can result in excessive levels 
of carbon monoxide which can cause severe 
personal injury or death!
2.   Exemptions — The following equipment is exempt from 
248 CMR 5.08(2)(a) 1 through 4:
a.  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
b. 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.
3.  MANUFACTURER REQUIREMENTS - GAS EQUIPMENT VENTING 
SYSTEM PROVIDED.
a.  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:
  i.  Detailed instructions for the installation of the venting 
system design or the venting system components; and
  ii.   A complete parts list for the venting system design or 
venting system. 
4.   MANUFACTURER REQUIREMENTS – GAS EQUIPMENT VENTING 
SYSTEM NOT PROVIDED.
a.  When the manufacturer of a Product Approved side wall 
horizontally vented gas fueled equipment does not provide 
the parts for venting the  ue gases, but identi es “special 
venting systems”, the following requirements shall be 
satis ed by the manufacturer:
  i.  The referenced “special venting system” instructions 
shall be included with the appliance or equipment 
installation instructions; and 
 ii.  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.
5.  A copy of all installation instructions for all Product Approved 
side wall 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.
  Improper venting can result in excessive levels of
carbon monoxide which can cause severe personal 
injury or death!










