Installing The Exhaust And Air Intake System; Important Factors For Terminal Orientation And Location - Watts AERCO EXT Installation, Operation & Maintenance Manual

Modulex EXT Commercial Series
CHAPTER 4: Installation Instructions

4.22 Installing the Exhaust and Air Intake System

NOTE: 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 Propane 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.
Do not 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 4-15: 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.
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