User Guide

97
Appendix B: Special Requirements For Side-Wall Vented Appliances
In The Commonwealth of Massachusetts
IMPORTANT
The Commonwealth of Massachusetts requires compliance with regulation 248 CMR 4.00 and 5.00 for
installation of side-wall vented gas appliances as follows:
(a) 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,includ-
ingbutnotlimitedtodecksandporches,thefollowingrequirementsshallbesatised:
1. INSTALLATION OF CARBON MONOXIDE DETECTORS. At the time of installation of the side wall horizon-
tal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 ser-
vicesofqualied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
attic, the hard wired carbon monoxide detector with alarm and battery back-up may be installed on the next
 adjacentoorlevel.
b. 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.
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certied.
3.SIGNAGE.Ametalorplasticidenti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”.
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) 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 system components with the equipment, the instructions provided by the manufacturer for installation of the
equipment and the venting system shall include: