AE Exhaust & Duct Services provides full installation, maintenance, repair on a variety of Restaurant exhaust fans, call us we are available 24/7.
Our Restaurant exhaust fan services include:
Restaurant exhaust fan repair – Exhaust fan installation – Retrofit exhaust fan – Restaurant exhaust fan maint. – Belt replacements – Motor change-outs – Bearing greasing – Complete unit change-outs – Custom installs – Emergency service.
Frequently Asked Fan Questions
Can I order a fan without a motor?
Yes, most fan models can be ordered this way. This is called a fan shell, It is a complete fanless drive package, The drive package is the motor, pulley, and belts.
This is called a fan shell, It is a complete fanless drive package, The drive package is the motor, pulley, and belts.
How do you replace a pulley?
Single groove pulleys are usually easy to remove by loosening the setscrew, larger pulleys that have a tapered compression bushing are removed by taking out the two hex bolts and placing them in the other two holes.
When tightened the bushing will pop out and the pulley can be removed. When replacing make sure the taper of the pulley and bushing match.
The fan is vibrating. What is wrong?
Several things can cause vibration, before assuming the wheel is unbalanced, check other possible causes first.
Look for any obvious signs of a rag or foreign object stuck in the wheel, mechanical problems can be the motor, belt, bearings, or wheel.
Remove the belt and run only the motor if it vibrates replace the motor, check the belt if it is in poor condition replace.
Make sure the blower pulley and the motor pulley are in alignment, check bearings for wear or damage, they may also need lubrication.
Finally, make sure that the fan is secured to the curb, just adding an extra screw can sometimes quite a noisy fan if a fan is operating outside its performance range it will also vibrate.
The fan leaks when it rains?
First, you need to verify if the water is leaking inside or outside the duct, if the water is inside the exhaust plenum, the area behind the filters, the grease drain on the fan may be clogged and the water is overflowing on the lower baffle assembly.
The silicon seal between the baffle assembly and the fan base could also be the cause of the leak if the water is leaking outside the duct is dripping on the outside of the hood or collecting in the light fixtures the problem is probably the curb was not flashed to the roof properly.
The fan motor shut off and starts again after several minutes?
The motor is probably shutting off on thermal overload, the motor is overheating restarts after it cools down and the thermal overload resets.
This only happens with single phase motors that are thermally protected, the nameplate will tell you if it has internal protection, measure the amp draw while the motor is running and compare it with the nameplate.
If it is not much higher you may need to slow the fan down until it is at or below the running amps indicated on the nameplate.
If slowing the fan down is not an option you need to replace the motor with a larger HP motor. Lastly, it could be a defective motor.
The fan overload trips?
The overload provides protection for motors without internal thermal protection, this is on all three phase and large single phase motors.
If a motor over amps or the current draw on the incoming power leads is unbalanced the overload will trip, over amping can be the result of using a motor not large enough or running the fan at higher RPM’s than needed.
If you can slow the fan down this should be your first choice, if this is not an option replace the motor with a larger HP one.
Unbalanced loads can be the result of a defective motor or unbalanced power supply if one of the lines of a 3-phase power supply has lost its voltage the motor will run on only two lines and overamped.
Another common cause of overload tripping is a lightning storm or power outage, when the power comes on again voltage is usually low because of the great demand on the power grid, as voltage goes down the amperage goes up and the overload trips.
The exhaust fan is not performing as well as it did in the past?
This could be the result of a loose or worn belt, other possible causes are dirty – clogged filters, fan wheel is loaded with grease.
The motor on a direct drive fan is running at higher amps than the nameplate lists?
On direct drive motors, the FLA listed on the nameplate is the amperage at its highest speed, the speeds control reduces the speed of the motor by lowering the voltage supplied.
Basic electrical laws dictate that when you decrease the voltage the amperage increases, this is normal for these types of motors, speed controls used on direct drive fans are rated higher than the motor to accommodate this increase.
If a prewire is included on the job you will need to replace the contactors and/or overloads because of the change in FLA (refer to the motor label).
NOTE: A single phase motor cannot be converted to three phase and a three phase cannot be converted to single phase. The motor must be replaced.