Installation Guide

Page. 11
Equivalent Duct Lengths for Commonly
Used Transitions
Size (in)
Equivalent
Length (ft)
Size (in)
Equivalent
Length (ft)
6 1.2
6 10
8 0.7
10 0.6
3¼" x 10", straight N/A 1
3¼" x 10", Center
reverse elbow , right
N/A 25
3¼" x 14", straight N/A 0.7
3¼" x 10", Left
reverse elbow
N/A 15
3¼" x 10", Right
reverse elbow
N/A 25
6 12
6 2
8 6
8 2
10
10 2
6 5
6 2
2
5
8 3
8 2
2
2
10
10
3¼" x 10",
90° elbow , round
N/A 5
2’ long, 3¼" x 10
" flex N/A 20
3¼" x 10",
45° elbow , round
N/A 15
3¼" x 10", Flat elbow N/A 20
6 1
8 10
8 2
3¼" x 10", Roof jack
and shutter
N/A
6 5
6 10
NOTE: These commonly used installation parts can be purchased at a
local hardware store. Thermador does not manufacture all these parts.
Round wall cap
Round roof cap
3¼" x 10" to round
90° elbow ,
Duct Piece
3¼" x 10" Center
reverse elbow , left
15N/A
Round to 3¼" x 10"
3¼" x 10" to round
Round to 3¼" x 10"
90° elbow ,
Duct Piece
Smooth, straight
90° elbow , round
45° elbow , round