Average Reviews:
(More customer reviews)The cheaper duct boosters use rectangular shaded pole motor which need a filter to protect from dirt/dust.This one uses a large enclosed cylindrical motor.Very sturdy looking.Probably still a good idea to put in a filter, but you can do without.
Note: Cheaper fans with shaded pole can be speed controlled with a simple fan speed control/switch.To control this motor's speed, you'll need to get the Tjernlund control which fits in the junction box on the side of the duct booster housing.I think about $40.
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Product Description:
Designed for powered air intake and exhaust systems, or to boost air flow in hard-to-heat or -cool areas. Easy to install in metal and flex duct. Galvanized steel housing with built-in duct stop on the inlet and crimped edge on the outlet.
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