11
DUCT PIECES
ROUND
STRAIGHT
90°
ROUND
ELBOW
45°
ROUND
ELBOW
3¼”x10”
90°ELBOW
ROUND TO
3¼”x10”
3¼”x10”
TO ROUND
ROUND TO
3¼”x10”
90° ELBOW
3¼”x10”
TO ROUND
90° ELBOW
3¼”x10”
45°ELBOW
3¼”x10”
FLAT
ELBOW
3¼”x10”
STRAIGHT
3¼”x14”
STRAIGHT
1’
1’
6”
7”
8”
6”
7”
8”
6”
7”
6”
7”
6”
7”
6”
7”
6”
7”
8”
10”
1.2’
12’
8’
1’
1’
5’
3’
10’
8’
10’
5’
6’
5’
N/A
5’
N/A
15’
N/A
15’
N/A
6”
7”
8”
6”
7”
8”
2’
LONG
3¼”x10” FLEX
MODEL #RD 1
3¼”x10”
TO ROUND
3¼”x10”
WALL CAP
7” In-Line
Backdraft
Damper
3¼”x10”
CENTER
REVERSE
ELBOW
LEFT
3¼”x10”
RIGHT
REVERSE
ELBOW
3¼”x10”
LEFT
REVERSE
ELBOW
ROUND
WALL CAP
Model #WC8
Model #WC10
ROUND
ROOF
CAP
3¼”x10”
CENTER
REVERSE
ELBOW
RIGHT
3¼”x10”
Roof Jack
& Shutter,
Model #RJ310
3¼”
10”
6”
10”
15’
2’
2’
20’
1’
2’
5’
5’
N/A
25’
N/A
25’
N/A
20’
4’
3’
1’
0.95’
0.7’
0.7’
0.6’
DUCT PIECES
EQUIVALENT
LENGTH
SIZE
TOTAL
EQUIVALENT
LENGTH
QUANTITY
USED
EQUIVALENT
LENGTH
SIZE
TOTAL
EQUIVALENT
LENGTH
QUANTITY
USED
TOTAL
Ventilator Performance Calculation
Round pipes
An inner diameter of Ø 8" (200 mm) is recommended.
Flat ducts
The inner cross-section must correspond to the diameter
of the round pipes.
Ø 8" (200 mm) approx. 50.3 inches
2
(324 cm
2
)
Flat ducts should have no sharp deflections.
Use sealing strip for deviating pipe diameters.
Checking the wall
The wall must be level, vertical and adequately load-
bearing.
The depth of the bore holes must be the same length
as the screws. The wall plugs must have a secure grip.
The enclosed screws and wall plugs are suitable for
solid brickwork. Suitable fasteners must be used for
other structures.
