Navien NFB-175 Mode D'emploi page 2

Requirements for the State of Massachusetts
NOTICE BEFORE INSTALLATION
This appliance must be installed by a licensed plumber or gas fitter in accordance with the Massachusetts Plumbing and Fuel Gas Code 248
CMR Sections 4.00 and 5.00.
IMPORTANT: In the State of Massachusetts (248 CMR 4.00 & 5.00)
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. No installation or replacement of a vented gas appliance shall be permitted unless a
battery powered or electrically hard wired carbon monoxide detector is present on the same floor as the appliance or on the next adjacent
floor when the appliance is located in a crawl space unless the appliance is located in a detached, uninhabitable garage. For all residential
dwellings, a carbon monoxide detector must also be present on each habitable level of the dwelling. These requirements shall not be
deemed to waive any additional requirements imposed by M.G.L. c. 148 §26F1/2.
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. Whenever any through-the-wall vent is installed less than seven feet above the finished grade, a metal or plastic identification
plate shall be permanently mounted to the exterior of the building at a minimum height of eight feet above grade directly in line with the
exhaust vent terminal. The sign shall read, in print size no less than 0.5 inches 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 5.09 and 5.12.
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