Important
• A 6” round (standard for this range hood) or 3-1/4 x 10” rectangular duct (purchased sepa-
rately) must be used to maintain maximum airflow efficiency.
•
A
lways use rigid type metal/aluminum ducts
,
if available
,
to maximize airflow
.
•
Refer to the
Duct Run Calculation method
described
below to compute the total available duct run
when using elbows, transitions
,
and caps.
•
R
educe the number or transitions and turns
as much as possible
. If
a
long duct run is required,
increase
the
duct size from 6” to 7” or 8”. If a reducer is used, install a long reducer instead of a
pancake reducer.
• Reducing
the
duct size will restrict and
, eventually,
decrease airflow
.
T
hus
, if absolutely necessary,
reduce
the
duct size as far away from
the unit
as possible.
• If turns or transitions are required
,
i
nstall
them
as far away from
the unit
and as far apart
from each other
,
as pos
sible.
•
The m
inimum height between
the
stove top to
the
hood bottom should be no less than
27.5".
•
The m
aximum height between
the
stove top to
the
hood bottom should be no higher than 3
0"
.
• It is important to install the hood at the proper mounting height. Hoods mounted too low could result in
heat damage and
constitute a
fire hazard; while hoods mounted too high will be hard to reach and
will loose performance and efficiency.
• If available, also refer to
the
stove manufacturer’s height clearance requirements and recommended
hood mounting height above range.
WARNING
:
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” adapt
e
r, 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 Calculation example:
One roof cap, one 90º elbow, and one 45º elbow
used: 9ft + 5ft = 14 ft used.
Deduct 14 ft from 30ft, 16ft maximum available for
straight duct run. If no elbows are used, maximum
run is 30 ft (recommended).
Recommended maximum run
R6” or 3-1/4 x 10” duct
Vent piece deduction
Each 90º elbow used
Each 45º elbow used
Each 6” to 3/14 x 10” transition used
Side wall cap with damper
Roof cap
9 ft
5 ft
7 ft
0 ft
0 ft
30 ft
Duct Run Calculation:
6