www.KitchenHoods.ca
Duct Run Calculation:
Recommended maximum 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
IMPORTANT:
• A minimum of 6” round (standard for this range hood) or 3-1/4 x 10” rectangular duct (purchased
separately) must be used to maintain maximum airflow efficiency.
• Always use rigid type metal/aluminium 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 2, as possible.
• Minimum mount height between stove top to hood bottom should be no less than 28-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 loose its performance
and efficiency.
• 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 - 3-1/4 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
straight duct run.
