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Indoor Gardening Exhaust Fan Options
What are the differences in exhaust fans
and which ones can be used in grow tents?
Inline Duct Booster Fans
The inline duct booster fans are too
weak to move any real heat issue out of a tent. These are made to
help a bigger fan with a long length of ducting. There may be some
applications where they can be used in other ways for minimal air
The axial fans are a little better,
but only if you don't really have a heat issue, or if the area
you're trying to exhaust air from is really small. One axial fan
will work OK as an exhaust, but if you add another axial fan for an
intake somewhere else, together they'll work pretty good, but again-
I wouldn't count on them for a real heat problem, or to move air
through a reflector or ducting unless it's a small application.
Squirrel Cage Fans
The squirrel cage fans are the 'old
fashioned' way to move air before the centrifugal fans came out. If
you mount them "free-flowing" so they don't have any restriction
(like carbon filters, reflectors, or any length of ducting) they
work OK. They are inexpensive, and they do have some good
The centrifugal type fans are the best
approach to most exhaust needs. They always have enough torque to
move air with only one fan unless you've got multiple ducted lights.
These are also powerful enough to draw air through a respectable
length of ducting, or though a reflector, or exhaust hot air
completely into another room in your house. We've got a bunch of
different brands of centrifugal fans to choose from, but they're all
good fans. The Windtunnel's are the quietest of our fans, the
EcoPlus fans are powerful and cheap, the CAN's and Vortex fans are
the best quality of our fans and have the longest warranties.
CAN Max Fans
The CAN Max fans are a new exclusive
breed of exhaust fan. They use less electricity, they are the
quietest fans on the market, and they are very powerful. These are
top of the line in exhaust.
AIR FLOW is important!
Remember, that in every exhaust
application, you have to have an unrestricted intake somewhere in
the enclosure. If you run an exhaust fan without another fan for
intake (not always necessary), or without a passive intake (a hole)
somewhere in the room, you may run into heat issues. Any exhaust fan
is going to need an intake in order to work to it's best ability. A
rule of thumb is that if you have one 6" exhaust fan, you should
have the equivalent of 2- 6" holes for passive intake somewhere else
in the enclosure or room.