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Duct Preparation
Refer to the table below for recommended maximum straight lengths of duct to
provide adequate performance.
Refer to the table below for recommended sheet metal elbows, transitions, and
wall cap equivalent straight lengths.
IMPORIMPOR
IMPORIMPOR
IMPOR
TT
TT
T
ANTANT
ANTANT
ANT
• Tape all duct joints securely to prevent combustion by-products, smoke or odors
from entering the home. This will also improve the efficiency of the system.
• Do not exhaust more than one vent into a single duct run.
• Only use ductwork constructed of materials deemed acceptable by state,
municipal and local codes.
Recommended sheet metal elbows, transition, and wall cap equivalent straight lengths
E30WV60EPS
E36WV60EPS
E48WV12EPS
E308WV60ES
E368WV60ES
E488WV120S
Maximum Equivalent Straight LengthsModel Duct
Size
3 1/4” x 10” 50’
50’10”
E30WV60EPS
E36WV60EPS
E308WV60ES
E368WV60ES
60’8”
3 1/4" x 10" 90° Elbow 3 1/4" x 10" 45° Elbow 3 1/4" x 10" Wall Cap 3 1/4" x 10"
90° Flat Elbow
Transistion
3 1/4" x 10" to Round
45° Elbow - Round Duct 90° Transistion
3 1/4" x 10" to 8" Round
90° Elbow - Round Duct
15 Feet 7 Feet 2 Feet 20 Feet
8" Diameter - 4 Feet
10" Diameter - 4 Feet
8" Diameter - 3 Feet
10" Diameter - 2 Feet
25 Feet
8" Diameter - 7 Feet
10" Diameter - 5 Feet