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Modulex Light Commericial Series
CHAPTER 4: Installation Instructions
The minimum distance from adjacent public walkways, adjacent buildings, openable windows
and building openings shall not be less than those values specified in the National Fuel Gas
Code, ANI Z223.1 / NFPA 54 and/or the Natural Gas and Propabne Installation Code CAN/CSA
B149.1.
Do not extend exposed vent pipe outside the building beyond recommended distance.
Condensate could freeze and block vent pipe.
Vent should terminate at least 3 ft (915 mm) away from adjacent walls, inside corners and 5 ft.
(1525 mm) below roof overhang (see Figure 4-27).
It is not recommended to terminate vent above any door or window, as condensate can freeze
causing ice formations.
Do not use a chimney as a raceway if another boiler or fireplace is vented into or through the
chimney.
Figure 4-27: Minimum Distances of Exhaust Opening and Building Features
Important Factors for Terminal Orientation and Location
Terminals should be positioned so as to avoid products of combustion from entering openings
into the buildings or other vents.
The terminal should be located where dispersal of combustion products is not impeded and with
due regard for the damage or discoloration that might occur to building surfaces in the vicinity.
In certain weather conditions condensation may also accumulate on the outside of the air inlet
pipe. Such conditions must be considered and where necessary insulation of the inlet pipe may
be required. In cold and/or humid weather water vapor may condense when leaving the vent
terminal. The effect of such condensation must be considered. The terminal must be located in
a place not likely to cause a nuisance.
Maintain 12" of clearance above the highest anticipated snow level or grade or whichever is
greater. Please refer to your local codes for the snow level in your area.
The whole route of the vent system must be installed upwards and never completely nor partly
downwards.
OMM-0087_J • GF-143 • 11/17/2020
Technical Support • (800) 526-0288 • Mon-Fri, 8 am - 5 pm EST
Page 54 of 150
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