Page 8
Ventilator Performance Calculation
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. Bosch 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
15
N/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
