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27
Proper installation of ducting is extremely
important to ensure maximum performance from
any ventilation product.
• All CFMs are based on tests at 0.1 static pressure:
without applying static pressure, CFM would be
greatly overstated.
• Straight runs and gradual turns are best; for
example, each 90º elbow is equivalent to 5-10 feet
(1.52-3.05 cm) of straight run.
• Never use flexible duct; it creates back pressure/air
turbulence and greatly reduces performance.
• Proper performance is dependent on proper ducting;
make sure that a qualified and trained installer is
used.
• Check with a qualified and trained installer or local
codes for makeup air requirement, if any.
• Max. amp rating for hoods includes recommended
ventilator kit rating; all products must be hard wired
direct with 2-wire with ground.
Plan where the duct work will be located. Install proper-
sized duct work, and roof or wall cap for the type of
blower you are using. Recommended hood locations
for the most common installations are shown. Adjust
your measurements for various heights of ceilings,
soffits, cabinets, or ranges/rangetops.
Check Framing
NOTE: Because of the weight of the hood make sure that
the mounting screws are driven into the framing and not
just the drywall. It may be necessary to drill additional
holes in the canopy for proper alignment.
Roof Cap
7” round duct
Duct cover or soffit
300 or 600 CFM
single blower
interior-power
typical ductwork
Hood
Roof cap
10” round duct
Duct cover or soffit
1200 CFM
single blower
interior power
typical ductwork
Hood
Exterior blower
10” round duct
Duct cover or soffit
900, 1200, or
1500 CFM
exterior power
typical ductwork
Hood
Duct
Duct cover or soffit
Wall Installation exterior
power typical
ductwork
NOTE: Wall exhaust must be a minimum of 24” (61.0 cm)
from ground. This may vary depending on local codes
and geogra
p
hic location.
Hotte
Wall Cap
Planning Information
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