Installation
900683-01F, 10/2018
Innovative Hearth Products
DRT3500 Series Direct-Vent Gas Fireplaces
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COMMONWEALTH OF MASSACHUSETTS REQUIREMENTS
These appliances are approved for installation in the US state of Massachusetts if the following additional
requirements are met:
• Install this appliance in accordance with Massachusetts Rules and Regulations 248 C.M.R. Sections 4.00
through 8.00.
• Installation and repair must be done by a plumber or gas fitter licensed in the Commonwealth of Massachusetts.
• The flexible 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.
Massachusetts Horizontal Vent Requirements
In the Commonwealth of Massachusetts, horizontal terminations installed less than seven (7) feet above the finished
grade must comply with the following additional requirements:
• A hard wired carbon monoxide detector with an alarm and battery back-up must be installed on the floor level
where the gas fireplace is installed. The carbon monoxide detector must comply with NFPA 720, be ANSI/UL
2034 listed and be ISA certified.
•
A metal or plastic identification plate must be permanently mounted to the exterior of the building at a minimum height of eight (8) feet
above grade and be directly in line with the horizontal termination. The sign must read, in print size no less than one-half (1/2) inch in size, GAS
VENT DIRECTLY BELOW. KEEP CLEAR OF ALL OBSTRUCTIONS.
COLD CLIMATE INSULATION
For cold climate installations, seal all cracks around your fireplace with noncombustible material and wherever cold
air could enter the room. It is especially important to insulate outside chase cavity between studs and under floor on
which fireplace rests, if floor is above ground level. Gas line holes and other openings should be caulked or stuffed
with unfaced fiberglass insulation.
NOTE: Do not use loose, or blown-in insulation in the cavity surrounding the fireplace.
If the fireplace is being installed on a cement slab in cold climates, a sheet of plywood or other raised platform can
be placed underneath to prevent conduction of cold transferring to the fireplace and into the room. It also helps to
seal inside surfaces and tape for maximum air tightness and caulk firestops.
