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Duct Run Calculation:
Recommended maximum run
r
4
uct
50 ft
Vent piece deduction
Each 90º elbow used
9 ft
Each 45º elbow used
5 ft
c t
4
tr s t
use
7 ft
Side wall cap with damper
0 ft
Roof cap
0 ft
IMPORTANT:
Ŗ
u r u st
r r t s r
e
r
4
rect
u r uct urc se se r te
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
uct s e r
t r
re ucer s use st
re ucer ste
c e re ucer e uc
uct s e w restr ct r
w
ecre se r w t us re uce uct s e s r w r
e
s ss e
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
Ŗ
ſ
and ef
ſ
ciency.
Ŗ
If available, also refer to stove top manufacturer’s height clearance requirements and recommended hood
mounting height above range.
M
:
Ŗ
u
u
Ŗ
ect
u r
4
u re u res t
4
t r t su
e
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.
Calculating Vent System Length:
efficiency.
