TOA Electronics SSDVT-4035CNM User Manual
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NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE.
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Note: The following requirements reference various Massachusetts 
and national codes not contained in this document.
Requirements for the Commonwealth of Massachusetts
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 fi nished grade in the area of the venting, including but not limited 
to decks and porches, the following requirements shall be satisfi ed: 
Installation Of Carbon Monoxide Detectors
At the time of installation of the side wall horizontal vented gas fueled 
equipment, the installing plumber or gasfi tter shall observe that a hard 
wired carbon monoxide detector with an alarm and battery back-up is 
installed on the fl oor level where the gas equipment is to be installed. 
In addition, the installing plumber or gasfi tter shall observe that a bat-
tery 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 
qualifi ed licensed professionals for the installation of hard wired carbon 
monoxide detectors.
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 fl oor level.
 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, how-
ever, that during said thirty (30) day period, a battery operated carbon 
monoxide detector with an alarm shall be installed.
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 certifi ed.
Signage
A metal or plastic identifi cation 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.”
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.
Exemptions
The following equipment is exempt from 248 CMR 5.08(2)(a)1 through 4:
• 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
• 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.
MANUFACTURER REQUIREMENTS
Gas Equipment Venting System Provided
When the manufacturer of Product Approved side wall horizontally 
vented gas equipment provides a venting system design or venting sys-
tem components with the equipment, the instructions provided by the 
manufacturer for installation of the equipment and the venting system 
shall include:
• Detailed instructions for the installation of the venting system design
or the venting system components; and
• A complete parts list for the venting system design or venting sys-
tem.
Gas Equipment Venting System NOT Provided
When the manufacturer of a Product Approved side wall horizontally 
vented gas fueled equipment does not provide the parts for venting the 
fl ue gases, but identifi es “special venting systems”, the following require-
ments shall be satisfi ed by the manufacturer:
• The referenced “special venting system” instructions shall be included
with the appliance or equipment installation instructions; and
• 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.
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.
• Installation and repair must be done by a plumber or gas fi tter licensed
in the Commonwealth of Massachusetts.
• The fl exible gas line connector used shall not exceed 36 inches (92
centimeters) in length.
• The individual manual shut-off must be a T-handle type valve.