
Technical Information
69
T 80xx
Wall vent with flap
63 inches
Wall vent with louvers
157 inches
Calculating the maximum allowable length for 6" (150mm) ducting
When using 6" ducting, adequate air extraction is possible for an
effective
duct length of up to 108 ft. (1296 in.)
To calculate the
effective
duct length, proceed as follows:
A) Measure the total length of the proposed ducting, including any bends.
B) Determine the amount, angle, and type of bends that will be required.
C) Determine what type of fitting will be used to terminate the duct at the
outer wall (flap vent, louvered vent, grill, etc.).
D) Using the chart below, add the
additional length factor
of the bends and
fittings that will be used to the total length measured in Step A above. If
the sum is less than 108 ft. (1296 inches), the hood will be able to
exhaust the air without any problem. If the sum is greater than 108 ft., an
external fan may be required.
Type of bend or fitting
Angle of bend
Radius of bend
Additional length factor
Smooth bend
45°
4 inches
16 inches
45°
8 inches
10 inches
90°
4 inches
28 inches
90°
8 inches
19 inches
Elbow bend
45°
32 inches
90°
152
inches
Corrugated bend
90°
54 inches
Flexible metal duct
45°
8 inches
40 inches
45°
16 inches
32 inches
90°
8 inches
46 inches
90°
16 inches
37 inches
Wall vent with flap
63 inches
Wall vent with louvers
157 inches
R
Smooth Bend
90° Elbow
R
Corrugated Bend
R
Smooth Bend
90° Elbow
R
Corrugated Bend
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