High Speed Direct Drive Centrifugal Upblast Exhaust Fan with speed control (speed control included for single phase only), disconnect switch and 11-3/4" wheel. Exhaust Fan handles 900 CFM @ -0.500" wc ESP, Fan runs at 1485 RPM. Exhaust Motor: 0.333 HP, 1 Phase 115 V, 60Hz, 5.6 FLA, ODP (Open Drip Proof)
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Related Articles and Resources
1. Is there a warranty for this fan?
Yes. This equipment has a 1 Year Manufacturer Warranty to be free from defects in materials and workmanship, under normal use and service, for a period of 12 months from date of shipment. Download the warranty flyer here.
2. How do I know what size fan to order?
If you don’t know what size exhaust fan you need, we will need 4 pieces of information:
1. What size is your hood?
2. What equipment is under the hood?
3. How long is the duct from hood to fan?
4. How big is the curb?
It is also very helpful if you have pictures and/or information of the hood or existing fan (if you’re replacing one). Often times you will find a label that tells you CFM, RMP, HP, etc. Once you have gathered this information, email it to us and we will be able to identify the correct fan. You can also call us with the information if that is easier.
When sizing a new exhaust fan for replacement, it is important to know the base size you need. For a proper fit, make sure that the new fan base is larger than the existing curb.
3. Are the pulleys adjustable?
Yes. There is an adjustable sheave on the motor and two hex-set screws on the pulley. One screw secures the pulley to the shaft while the other allows the two halves to be adjusted closer together or further apart. When adjusting, you must retighten the hex-set screws on a flat side of the pulley base. You increase the fan speed by adjusting the halves closer together. Adjusting them further apart will slow the fan speed down. Double grove pulleys must be turned the same number of turns or the belts will not seat properly in the groves. After adjusting pulleys, it is very important to check motor amperage.
4. How do you replace a pulley?
Loosening the set screw will allow you to easily remove the single groove pulleys. For the larger pulleys with tapered compression bushing, take out the two hex bolts and place them in the other two holes. Once tightened, the bushing will pop out and the pulley can then be removed. When replacing a pulley, you must be sure that the taper of the pulley and the bushing match.
5. What should I do if the fan is vibrating?
Fan vibration can be caused by several problems. Inspect the fan for any rags or foreign objects stuck in the wheel. If the fan was recently cleaned, the wheel could be out of balance if not all of the grease was removed from the wheel. Mechanical problems include the motor, belt, bearings, or wheel. Check to see if the motor vibrates when you remove the belt and run only the motor. If it vibrates replace, the motor probably needs to be replaced. Check the condition of the belt to see if it needs to be replaced. Check the alignment of the blower pulley and the motor pulley. You can also check bearings for wear and tear, damage, or they may need lubrication. Finally, make sure that the fan is secured to the curb. Sometimes adding an extra screw can quiet a noisy fan. Another thing to keep in mind is that if a fan is operating outside of its specified performance range it will vibrate.
6. Why is the fan leaking when it rains?
Before you do anything else, first verify if the water is leaking inside or outside the duct. If the water is inside the area behind the filters (the exhaust plenum), then the grease drain on the fan may be clogged. This can cause water to overflow the venturi on the lower baffle assembly. Another possible cause of leaking is the silicon seal between the baffle assembly and the fan. If water is collecting in the light fixtures or is leaking outside the duct and dripping on the outside of the plenum, the problem is probably the curb was not flashed to the roof properly.
7. Why is the fan motor shutting off and starting again after several minutes?
This can be caused by thermal overload. The motor overheatS and restarts after it cools down and the thermal overload resets. This only happens with single phase motors that are thermally protected. You can access this information on the nameplate, which will tell you if the fan has internal protection. Measure the amp draw while the motor is running and compare it with the information on the nameplate. You may need to slow the fan down until it is at our 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. It is also possible that the motor is defective.
8. Why is the fan overload tripping?
The overload trip provides protection for motors without internal thermal protection – all three phase and large single phase motors. The overload will trip if a motor over amps or the current draw on the incoming power leads is unbalanced. Over amping can be cause by using a motor that is not large enough or by running the fan at higher RPM's than necessary. Slow the fan down if possible. If that is not an option, you will need to replace the motor with a larger HP one. Unbalanced loads can be caused by defective motors or unbalanced power supplies. The motor will run on only two lines and over amp if one of the lines of a 3-phase power supply has lost its voltage. Overload tripping is also commonly caused by lightening storms and power outages. When the power is restored, voltage is usually low because of the greater demand on the power grid. As the voltage decreases the amperage increases and causes the overload trips.
9. The exhaust fan / supply fan is not performing as well as it did in the past.
Exhaust fan and supply fan performance can be affected by loose or worn belts, dirty or clogged filters, or if the fan wheel is loaded with grease.
10. Is ETL the same as UL?
ETL and UL are both nationally recognized testing laboratories that test, certify and inspect products for safety and performance for manufacturers. Exhaust fans are tested to UL Standards UL762 and UL705.
11. Can I change the voltage of a fan in the field?
Yes, all motors are suitable for high and low voltage applications. To change the supply voltage, refer to the wiring instructions on the diagram on the motor label. If a prewire is included on the job the contactors and/or overloads will need to be replaced because of the change in FLA (refer to the motor label). You will need to rewire the KVA transformer for the new voltage if the supply fan is a heater. However, please note that a single-phase motor can’t be converted to three-phase, and a three-phase can’t be converted to single-phase. The motor must be replaced.