Modulex EXT Commercial Series Boilers User Manual
CHAPTER 4: Installation Instructions
OMM-0095_0H AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 Page 45 of 144
GF-139 Phone: 800-526-0288 09/15/2017
4.22 INSTALLATION OF THE EXHAUST AND AIR INTAKE SYSTEM
NOTES:
Consult local and state codes pertaining to special building code and fire department
requirements. Adhere to national code requirements.
Observe the listed maximum lengths of vent system which are boiler model dependent. The
maximum permissible lengths are listed in Section 4.23.
Minimum clearance of 4 ft. (1.22m) horizontally from, and in no case above or below, unless a 4
ft (1.22 m) horizontal distance is maintained, from electric meters, gas meters, regulators and
relief equipment.
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 4-16).
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 4-16: Minimum Distances of Exhaust Opening and Building Features
4.22.1 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
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