EQUIVALENT
RIGID
NUMBER
EQUIVALENT
DUCT PIECES
LENGTH
X
USED
=
LENGTH
Rigid Metal
1 Ft.
X
( )
=
Ft.
Ducting
(Preferred)
UL-Listed
Semi-Rigid
3 Ft.
X
( )
=
Ft.
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 90 FT.
Installation Instructions
27
DUCTING COMPONENT EQUIVALENCY CHART
2.5
″
(6.35
cm)
4
″
(10.2 cm)
TRANSITION DUCTING
(DRYER T
O
W
ALL)
INSIDE W
ALLS/CEILING
(W
ALL T
O
W
ALL CAP)
W
ALL CAPS
Less Than 4 Ft.
