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Duct Run Calculation:
Recommended maximum run
7” 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 7” to 3-1/4 x 10” transition used 7 ft
Side wall cap with damper 0 ft
Roof cap 0 ft
IMPORTANT:
Ŗ A minimum of 7” round (standard for this range hood) or 3-1/4 x 10” rectangular duct (purchased separately)
must be used to maintain maximum air ƀ ow ef ſ cien cy.
Ŗ Always use rigid type metal/aluminum ducts if available to maximize air ƀ ow when connecting to provided
duct.
Ŗ Please use
Duct Run Calculation
below to compute total available duct run when using elbows, transitions
and caps.
Ŗ ALWAYS, when possible, reduce the number or transitions and turns. If long duct run is required, increase
duct size from 7” to 8” or 9”. If a reducer is used, install a long reducer instead of a pancake reducer.
Reducing duct size will restrict air
ƀ ow and decrease air ƀ ow, thus reduce duct size as far away from opening
as possible.
Ŗ If turns or transitions are required: Install as far away from opening and as far apart, between 2, as possible.
Ŗ Minimum mount height between stove top to hood bottom should be no less than 24-inch for electric cook
tops and minimum of 30” for gaz stove tops and no higher than 30 inch for electric cook tops.
Ŗ It is important to install the hood at the proper mounting height. Hoods mounted too low could result in heat
damage and ſ re hazard; while hoods mounted too high will be hard to reach and will loose its performance
and ef ſ ciency.
Ŗ If available, also refer to stove top manufacturer’s height clearance requirements and recommended hood
mounting height above range.
Minimum Duct Size:
Ŗ Round - 7” minimum
Ŗ Rectangular - 3-1/4 x 10” minimum (requires a 7” to 3-1/4x10” adaptor, not supplied)
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 Calcuation 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.
Calculating Vent System Length :
efficiency.