IMPORTANT:
•
A minimum of 6” round or 3-1/4 x 10” rectangular duct (purchased separately) must be used to
maintain maximum airflow efficiency.
•
Always use rigid type metal/aluminum ducts if available to maximize airflow when connecting to
provided duct.
•
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” or 8”. 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 two
(2), as possible.
•
Minimum mount height between stove top to hood bottom should be no less than 24-inch for
electric cook tops and minimum of 30-inch for gas stove tops and no higher than 30-inch for electric
cook tops.
•
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 may be hard to reach and will lose its
performance and efficiency.
•
If available, also refer to stove top manufacturer’s height clearance requirements and recommended
hood mounting height above range.
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 elbows, and one 45º
elbow use
0ft + 9ft + 9ft + 5ft = 23ft used.
Deduct 23ft from 30ft, 7ft maximum
available for straight duct run.
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