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Rigid
Adjustable
Elbow
Inlet Duct
Adapter
Outlet Duct Adapter Kit
6" Clearance
for lter
8" to 5" Duct Reducers
(Flex Duct Insulation extended
over reducers and secured with
Duct tie)
Rigid Duct
secured with
screws to unit
adapter
Flex Duct secured and sealed with Duct tie
(2 places on Inlet)
(1 place on Outlet to secure Flex Duct to unit ange)
8" Insulated Flex Duct
Air Inlet
Wall
Cold Air
Exhaust
HVAC tape
used to seal
Reducer and
Termination
Joints
UL Certied
terminations
8" Insulated
Flex Duct
Exhaust/Inlet or both? Both, Inlet and Outlet
Ducting to outside of building or another room? Outside building.
Length of duct from water heater to termination? 20 ft.
Flexible or Rigid ducting? Flexible.
Diameter of ducting used? 8 in. Diameter
Diameter of wall penetrations? 5 in. Diameter
Number of elbows/bends? 3 Total – One on inlet and Two on Outlet
I. Does calculated ducting length exceed maximum allowable table?
a. 20 ft. (Outlet duct length)
b. 10 ft. (1 rigid elbow and 1 bend on outlet)
c. 20 ft. (reduced diameter termination outlet)
d. 20 ft. (Inlet duct length)
e. 5 ft. (1 Bend on inlet)
f. 20 ft. (reduced diameter termination inlet)
g. Total = 20+10+20+20+5+20 = 95 ft.
Using flexible 8 in. diameter duct, the maximum duct length allowed is 125
ft.; therefore, because 95 ft. is less than 125 ft., this is an acceptable ducting
configuration.
Accessory Kits SP20887 (2 Kits), SP20889 (2 Kits) and SP20890 (1 Kit) are
available for this installation.
Ducting Example:
NOTICE: These
seven questions
should be answered
to ensure correct duct
configuration.
See Ducting Example.
Once the duct
terminal location has
been determined,
make a hole through
the exterior wall
to accommodate
the UL Certified
Termination.
Termination must
exit exterior wall
horizontally only.
Complete rest of the
duct pipe installation
to the water heater’s
duct connector
fitting.
If necessary,
support horizontal
run as previously
mentioned.
Horizontal Duct
Installation
Installing the water heater
14
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