7
IMPORTANT
:
•
Please use
Duct Run Calculation
below to compute total available duct run when using elbows,
transitions and caps.
•
ALWAYS, when possible, reduce the number or transitions and turns. If long duct run is required,
increase duct size from 6” to 7”, 8” or 9”. If a reducer is used, install a long reducer instead of a pancake
reducer. Reducing duct size will restrict airflow and decrease airflow, thus reduce duct size as far away
from opening as possible.
•
If turns or transitions are required: Install as far away from opening and as far apart, between 2, as
possible.
•
Minimum mount height between stove top to hood bottom should be no less than 24-inch.
•
Maximum mount height between stove top to hood bottom should be no higher than 32-inch.
•
It is important to install the hood at the proper mounting height. Hoods mounted too low could result in
heat damage and fire hazard; while hoods mounted too high will be hard to reach and will reduce its
performance and efficiency.
•
If available, also refer to stove top manufacturer’s height clearance requirements and recommended
hood mounting height above range.
Minimum Duct Size:
•
Round - 6” minimum
•
Rectangular - 3-1/4 x 10” minimum (requires a 6” to 3-1/4x10” adaptor, not supplied)
Calculating Vent System Length
To calculate the length of the system you need, deduct the equivalent feet for each vent piece used in the
system from the recommended maximum duct run.
Duct Run Calculation example:
One roof cap, two 90º elbow, and one 45º elbow used:
0ft + 9ft + 9ft + 5ft = 23ft used.
Deduct 23ft from 50ft, 27ft maximum available
for the duct run.
Duct Run Calculation
Recommended maximum straight duct run
6” or 3-1/4 x 10” duct
50 ft
Vent piece deduction
Each 90º elbow used
9 ft
Each 45º elbow used
5 ft
Each 6” to 3/14 x 10” transition used
7 ft
Side wall cap with damper
0 ft
Roof cap
0 ft