Modern-Aire Ventilation Hood Installation Instructions - page 4
For maximum cfm a straight duct run will perform the best, the
fewer elbows and angles the better the blower will perform. Tape
all joints to keep duct run airtight. When you are installing island
hoods cut hole in the ceiling or soffit, first run ducting then attach
duct cover to the hood. Make sure this area you have chosen is
designed to support at least 200-300 lbs depending the size and
weight of your hood this may require extra support. Additional
support can be added using threaded rod from the ceiling to each of
the four corners of the hood (holes must be pre-specified or drilled
after hood is received, only by a trained professional. The last step
will be to install your chosen blower either inside the hood, or to
exterior location.
Most wall duct covers attach to hood after it goes in place (use
duct cover to space hood from ceiling or soffit, first).
Ducting for Blowers:
It is important when installing a hood to only use rigid metal
ducting. In many states it is against code to use plastic ducting.
Every city and state code is different, but for maximum efficiency
and to help prevent fire in your home use metal ducting. When
grease collects in plastic ducts there is a tendency for animal
infestations, they see this as a warm place to sleep and a good
source of food. This is also easily avoided by using proper roof
flanges and covers for wall mounted blowers. Also never vent into
your attic or crawl spaces for just this reason.
Roof Mounted blower installation:
Start by placing the blower on the rear slope of the roof, try
to minimize duct run for best performance. Make blower access is
free of obstruction, and keep top of blower level to avoid being
seen from the street.
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Modern Aire at
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rangehoods
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kitchen
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accessories
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rangehoods
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Call 1-800-667-8721 anywhere in the US and Canada
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www.rangehoods.com