Duct Deductions:
Each 90° bend
9 ft
Each 45° bend
5 ft
Each 6” to 3
¼
” x 10” transition
7 ft
Side wall cap with damper
1 ft
Roof Cap (with factory Damper)
1 ft
Duct Deduction Calculation Example:
A minimum of 6” round (standard for this range hood) or 3
¼
” x 10” rectangular duct
(purchased separately) must be used to maintain maximum airflow efficiency.
A flexible 6" round duct is provided for convenience and for use in difficult installations,
however always attempt to use a smooth metal/aluminum rigid type of ducting to maximize
airflow efficiency.
ALWAYS, when possible, reduce the number or transitions and turns. If long duct run is
required, increase duct size to 7” or 8”. If a reducer is used, install a long reducer instead of a
pancake reducer. Any reductions of duct size will restrict and decrease airflow; to maximize
airflow flow efficiency place any reducers furthest away from any bends or transitions.
If turns or transitions are required, install them as evenly distanced as possible, and as far
away from the range hood as possible.
Please use Duct Run Calculation below to compute the total available duct run when using
elbows, transitions and caps.
It is important to install the hood at the proper mounting height. Hoods mounted too low is
considered unsafe and could result in heat damage and fire hazard; while hoods mounted too
high are harder to reach and will loose general effectiveness.
Minimum mount height between stove top to hood bottom should be no less than 28“.
Any less is considered unsafe and not recommended.
Maximum mount height between stove top to hood bottom can be higher than 31 inch*, but
is recommended to be the best efficiency. (Extension available*)
If available, also refer to stove top manufacturer’s height clearance requirements and
recommended hood mounting height above range.
* Due to different ceiling height configurations, recommended height may not be applicable.
Minimum Duct Size:
Round - 6” minimum
Rectangular - 3
¼
” x 10” minimum (requires a 6” to 3
¼
” x 10” adaptor, not supplied)
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Pg 6
Height & Clearance
Duct Size Upgrade Calculator
Minimum duct size recommended is 6” round (or 3
¼
” x 10” rectangular). Maximum duct
length recommend is 50 ft. Any duct length over 50 ft is recommended to use a larger
diameter duct size.
Survey the installation application and record the estimated length of ducting required or
used for that application. Record the number of bends, angle of bends, and/or any
transitional pieces used. Each bend or transition will reduce air flow and reduce the
recommended duct length.
(1) 90° bend, (1) 3
¼
” x 10” transition, (2) 45°
bends, (1) sidewall cap with damper (with
factory damper not installed)
-9ft + -7ft + -5ft + -5ft + -1ft = -27ft
Deduct 27 ft from 50 ft, giving you 23 ft of
available straight ducting before it is
recommended to upgrade your ducting size.
