Use And Care Manual

13
Elbows/Bends
Rigid duct elbows and flex bends
greater than 45° is considered an elbow.
Flexible ducting bends’ inner radius
cannot be less than its diameter. If
bends with tighter radiuses are needed,
a rigid elbow must be used.
Maximum number of elbows/bends
allowed are shown in [brackets] in
Table 2.
Terminations/Registers
Table 2 equivalent feet for terminations
includes the rodent screen.
For terminations and registers with
smaller diameters than the duct
diameter, Table 2 accounts for the duct
reducer and termination/register. Smaller
diameter terminations and registers
with more than a 2 ft. connection is not
supported.
Damper
If ducting to the outside using an
exhaust duct only (no intake duct), an
approved Rheem damper should be
installed no further than 10 ft. of rigid
ducting total (two elbows equivalent)
from the unit. This prevents outside
air from coming into the living space.
If ducting air from the outside to
the inlet of the heater, no provision
is made to prevent outside air from
flowing into the living space.
Equivalent feet for Duct Accessories
Table 2.- Equivalent feet for Duct Accessories.
Description 8" 7" 6" 5"
Elbows/Flexible Bends (Each)
[Maximum Allowed]
5'
[8]
5’
[6]
5’
[4]
5’
[2]
8 inch UL Certied Termination for ducting outside (Each) 5' 5' 5' 5'
Reduced diameter UL Certied Termination for ducting outside (Each) N/A 10' 15' 20'
8 inch Register for ducting inside (Each) 5' 5' 5' 5'
Reduced diameter Register for ducting inside (Each) N/A 10' 15' 20'
Rodent Screen (must be greater than 83% open area) (Each) 1' 1' 1' 1'
Rheem approved 8" diameter Duct Damper 25' 20' 10' 5'
Table 2 lists equivalent feet for duct accessories and reduced diameter terminations.
Accessory Kits
Part Number Description User For
SP20882 Earthquake Isolation Kit for Hybrid Water Heater. Installations in Seismic Regions.
SP20883 Vibration Isolation Kit for Hybrid Water Heater.
Installation on Non-Concrete
oors.
SP20884 8” Dia. UL Certied Termination kit.
Termination to the outside or to
attic with 8" diameter.
SP20885 7” Dia. UL Certied Termination kit.
Termination to the outside or to
attic with 7" diameter.
SP20886 6” Dia. UL Certied Termination kit.
Termination to the outside or to
attic with 6" diameter.
SP20887 5” Dia. UL Certied Termination kit.
Termination to the outside or to
attic with 5" diameter.
SP20888 8" Rheem Approved Damper Kit.
Exhaust only to the outside Ducting
Conguration (No inlet Duct).
SP20889 25’ Flexible 8” dia. duct kit.
For up to 25' of Ducting.
SP20890 Rigid Elbow duct kit.
Installation in tight places where
space needs to be minimized.