Installation Sheet
Polypropylene (PP) Common Venting Installation Instructions 26
Copyright © 2018 Rinnai America Corporation. All Rights Reserved.
Installaon Instrucons
The same procedure may be used
when substung the room air
adapter with the only excepon being
no ex connector or combuson air
header to connect when installing.
• Aer ensuring the water heaters are mounted securely
and spaced 20.5” apart, install the appliance adapter on
top of the water heaters.
• Exhaust Venng is designed for a 3° rise. When the
water heaters are mounted at 20.5” spacing, the height
increase is 1” per water heater. A 3” diameter
extension pipe is included with the kit that must be cut
to length to account for the rise from unit to unit. Aer
cung, always deburr and bevel the end of the vent
piece so the sealing gaskets are not damaged and
operaon of the vent system is not compromised.
• Install the elbows to the 3” diameter extension pipe.
Do not cut or modify the elbow.
• Aer direct vent or room air components are
appropriately posioned, securely fasten the
“Appliance Adapter ” to the top of the water heater
with a self tapping screw.
• For direct vent applicaons, connect the combuson air
opening of the appliance adapter to one end of the ex
connector and the other end of the ex connector to
the Combuson Air Header.
• Connect the open end of the elbow to header.
Elbow
3” Diameter
Extension
Combustion Air Header
Flex Connector
Exhaust Header
Self Tapping
Screw
Appliance
Adapter
Inline
# of Appl
L =
Back-to-Back
# of Appl
L =
1 5.5” 1+1a 5.5”
2 6.5” 2+2a 6.5”
3 7.5” 3+3a 7.5”
4 8.5” 4+4a 8.5”
5 9.5”
6 10.5”
7 11.5”
8 12.5”
Self Tapping
Screw