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English 5
Equivalent Duct Lengths for Commonly Used Transitions
Smooth
Straight
6 1.2
7 0.95
8 0.7
10 0.6
3¼" x 10"
Straight
N/A 1
3¼" x 14"
Straight
N/A 0.7
90° Elbow
Round
612
78
86
45° Elbow
Round
65
74
83
3¼" x 10"
90° Elbow
Round
N/A 5
3¼” x 10"
45° Elbow
Round
N/A 15
3¼" x 10"
Flat Elbow
N/A 20
Round to
3¼" x 10"
61
71
3¼" x 10"
to Round
65
73
Round to
3¼" x 10"
90° Elbow
610
78
3¼" x 10"
to Round
90° Elbow
610
75
3¼" x 10"
Center Reverse
Elbow Left
N/A 15
3¼" x 10"
Center Reverse
Elbow Right
N/A 25
3¼" x 10" Left
Reverse Elbow
N/A 15
3¼" x 10"
Right Reverse
Elbow
N/A 25
Round
Wall Cap
62
72
82
10 2
Round
Roof Cap
62
72
82
2' Long
3¼" x 10"
Flex
N/A 20
3¼" x 10"
to Round
10 1
7" Inline
Backdraft
Damper
7
3¼" x 10"
Roof Jack
and Shutter
N/A
NOTE: These commonly used installation parts can be purchased
at a local hardware store. THERMADOR® does not manufacture all
these parts.
Duct Piece
Size of Duct
Piece (in)
Duct Piece
Size of Duct
Piece (in)
Equivalent
Length (ft)
Equivalent
Length (ft)
Table 1: Duct Lengths