INSTALLATION
MOUNT HEIGHTS
DUCTING
18"
36"
96"
Min 24"-Max 32"
12"
Minimum mount height between range top to
hood bottom should be no less than 24".
Maximum mount height should be no higher
than 32".
It is important to install the hood at the
proper mounting height. Hoods mounted too
low could result in heat damage and fire haz-
ard; while hoods mounted too high will be
hard to reach and will loose its performance
and efficiency.
If available, also refer range manufacturer's
height clearance requirements and recom-
mended hood mounting height above range.
A minimum of 8" round duct must be used to
maintain maximum air flow efficiency.
Always use rigid type metal ducts only.
Flexible ducts could restrict air flow by up to 50%.
Also use calculation (on right) 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 8" to 9” or 10". If a reduc-
er is used, install a long reducer instead of a pan-
cake reducer. 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 Duct Size:
Round:
8" minimum
Duct Run Calculation:
Maximum run
8"
Deduct:
each 90 Elbow used
each 45 elbow used
each 8"
transition used
each 3/14 x 10" to 8"
each 3/14 x 10" to 8"
transition used
Side Wall Cap w/ damper
Roof Cap
100 FT
15 FT
9 FT
1 FT
5 FT
30 FT
30 FT
e.g.- 1 roof cap, 2x90 elbows, 1 x 45 elbow used:
=30' + 30' + 9' =69' used, 31' available for straight duct runs.
Models: AK7500, AK7536, AK7548
Page 1
INSTALLATION
DUCTING
NEVER exhaust air or terminate duct work into spaces between walls, crawl spaces, ceiling,attics or
garages. All exhaust must be ducted to the outside.
Use metal ductwork only.
Fasten all connections with sheet metal screws and tape all joints w/ certified Silver Tape or Duct Tape.
Some Ducting Options:
WARNING FIRE HAZARD
Models: AK7500, AK7536, AK7548
Page 2
Side wall cap
w/ gravity damper
Side wall cap
w/ gravity damper
Soffit or crawl space
Roof Pitch w/
Flashing & Cap
