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- Boosts the flow of air from the central heating system to areas in a house that are hard to heat or cool.
- Overcomes the added resistance in long duct runs.
- The prop fan type fits inside the duct.
- The squirrel cage type fan has the motor mounted outside of the duct.
- Most models vent about 200 cubic feet per minute in 6” to 8” diameter ducts.
- Wired in series with the central furnace blower or operated by an auxiliary thermostat.