Installation Guide

Polypropylene (PP) Common Venting Installation Instructions 22
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Combuson Air Requirements
Combuson air provided to the system should not
be taken from any area of the structure that may
produce a negave pressure (i.e. exhaust fans, pow-
ered venlaon fans).
NOTICE
Using Indoor Air For Combuson
When using air from other room(s) in the building, the
total volume of the room(s) must be of adequate
volume (Greater than 50 cubic feet per 1000 Btu/hr).
Each Combuson air opening must have at least one
square inch of free area for each 1000 Btuh, but not
less than 100 square inches each.
When communicang directly with the outdoors
through horizontal ducts, each opening shall have a
minimum free area of 1 in
2
/2000 Btu/hr (1100 mm
2
/
kW) of total input rang of all appliances in the
conned space.
Note: If ducts are used, the cross seconal area of the
duct must be greater than or equal to the required
free area of the openings to which they are
connected.
When communicang indirectly with the outdoors
through vercal ducts, each opening shall have a
minimum free area of 1 in
2
/4000 Btu/hr (550 mm
2
/
kW) of total input rang of all appliances in the
conned space. Combuson air to the appliance can
be provided from a well venlated ac or crawl
space.
WARNING
TO PREVENT POSSIBLE PERSONAL INJURY OR DEATH
DUE TO ASPHYXIATION,
COMMON VENTING WITH OTHER MANUFACTURER’S
INDUCED DRAFT APPLIANCES IS NOT ALLOWED.
□ Verify proper clearances around the vents.
□ Ensure that the Combuson Air Requirements
are followed that will provide sucient
combuson air for the appliance.
□ Ensure approved venng components have been
used.
□ All horizontal vent runs must be sloped up away
from the water heater a minimum of 1/4”(6 mm)
per foot.
□ Verify that there is adequate combuson air.
□ Installaon complies with Naonal Fuel Gas
Code, ANSI Z223.1/NFPA 54 as well as local and
state regulaons therein.
Checklist for Combuson Air and
Venng Requirements
(Be sure to also maintain 12” above grade or
ancipated snow level)
Vent terminaon per ANSI Z223.1/NFPA 54. For
clearances not specied in ANSI Z223.1/NFPA 54,
clearances are in accordance with local
installaon codes and the requirements of the gas
supplier.
Exhaust