I don t think i saw an attic fan under speed control.
Control dc attic fan speed by wifi thermostat.
Rotary fan controls have manual low speed trim adjustment to ensure proper restart after power interruption.
If he started an older.
It s even great for use in a garage and it s simple to operate just download the gaf wi fi vent app and use your smart phone or tablet to control the vent.
This efficient attic vent can move air at the rate of 1 450 cu.
Attic fan control via wifi and alexa by pochrist mar 19 2018 6 29pm pdt i have a attic fan circa 1970s it came with a double switch one high speed one low speed and a 60 min timer.
It features a 30 watt solar panel with 60 degree tilt for optimal sun exposure a preset thermostat and an ultra energy efficient dc motor.
This efficient attic vent can move air at the rate of 1250 cu.
Most are on thermostat switch which turns fan on or off depending on the temp.
This attic fan motor is the most expensive repair for attic exhaust fans.
As far as controlling the speed of the fan motor i think dc motors are better suited for such control.
Per minute and is designed for attics up to 2200 sq.
It s even great for use in a garage and it s simple to operate just download the gaf wi fi vent app and use your smart phone or tablet to control the vent.
Iliving 12 wall mounted shutter exhaust thermostat control 3 speeds vent fan for home attic shed or garage ventilation 600 cfm 900 sqf coverage area variable silver.
Install a fan speed control from grainger in a standard wall box for efficient control of ceiling attic kitchen or bathroom fans.
After you realize that it s not an electrical or thermostat problem the chances of it being a problem with the motor are quite high.
Per minute and is perfect for attics up to 2 300 sq.
It also includes an ac dc converter which allows the fan to run 24 7 even.
Sometimes it works out more economical to replace the attic fan thermostat instead of repairing it.
Subject putting speed control on attic fan.