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EQUIVALENT
RIGID NUMBER EQUIVALENT
DUCT PIECES LENGTH X USED = LENGTH
Rigid Metal 1 Ft. X ( ) = Ft.
Ducting
(Preferred)
UL-Listed 3 Ft. X ( ) = Ft.
Semi-Rigid
Metal Ducting
(inside diameter
does not change)
Elbows (90°/45°) 10 Ft. X ( ) = Ft.
Turns less 2 Ft. X ( ) = Ft.
Than 4 Ft.
Rigid Metal 1 Ft. X ( ) = Ft.
Ducting
4” Wall Cap 5 Ft. X ( ) = Ft.
Louvered Wall 10 Ft. X ( ) = Ft.
Cap
2.5” Wall Cap 23 Ft. X ( ) = Ft.
Total Ductwork Length = Ft.
TOTAL MUST BE LESS THAN OR EQUAL TO 150 FT.
Installation Instructions
31
DUCTING COMPONENT EQUIVALENCY CHART
2.5”
(6.35
cm)
4”
(10.2 cm)
TRANSITION DUCTING
(DRYER TO WALL)
INSIDE
WALLS/CEILING
(WALL TO WALL CAP)
WALL CAPS
Less Than 4 Ft.
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