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Frequently Asked Questions - Exhaust Fans
Exhaust Fan FAQ

Why are you recommending medium base CFL lights instead of standard incandescent lights?

Where is the model number located on my exhaust fan?

How do I clean my exhaust fan?

How do I get a copy of the instruction sheets?

Why do I need a bathroom exhaust fan?

How do I determine what size exhaust fan I need / How much ventilation do I need?

What is CFM?

What is a Sone?

Can I install my exhaust fan directly over the tub or in the shower?

Does it matter that there is insulation touching my exhaust fan?

Does my exhaust fan always need to be installed in the ceiling?

Where is the best location to install my bathroom exhaust fan?

Can I use a speed control with my exhaust fan?

What is the best way to duct my exhaust fan?

There is water dripping from my bathroom exhaust fan?

Do I have to exhaust my exhaust fan to the outdoors?

My exhaust fan is operating but the air is moving slower than normal?

My exhaust fan is louder than normal?

What is make up air?

My exhaust fan will not operate?

How do I order replacement parts?

 

 

Why are you recommending medium base CFL lights instead of standard incandescent lights?
As part of the Energy Indepedence and Security Act (EISA) 100 watt, 75 watt, 60 watt and 40 watt standard incandescent light bulbs are no longer being manufactured. They are still legal to be sold, but the bulb manufacturers have stop production. The 100 watt bulb was phased out in 2012 with the 75 watt bulb phased out in 2013. The 60 watt and 40 watt are being phased out in 2014. Air King is now recommending medium base compact fluorescent lamps (CFL) as a very viable alternative. Common sizes are 26 watt, 23 watt and 18 watt. A 23 watt CFL gives off the about the same amount of light as a standard 100 watt incandescent. So in reality, you are getting the same light at lower energy consumption.

Where is the model number located on my exhaust fan?
On most exhaust fans the model number is located on a sticker on the inside of the housing. You may need to remove the grill in order to see the model number.

How do I clean my exhaust fan?
MAKE SURE POWER IS SWITCHED OFF AT SERVICE PANEL BEFORE SERVICING THE UNIT. Clean your exhaust fan's grill with a mild detergent, such as dish washing liquid, and dry with a soft cloth. NEVER USE ANY ABRASIVE PADS OR SCOURING POWDERS. Completely dry before restoring power. NEVER IMMERSE ELECTRICAL PARTS IN WATER. The fan assembly can be vacuumed when build up (dirt, lint, etc.) accumulates over time.

How do I get a copy of the instruction sheets?
Instruction sheets can be downloaded from this web site. Please go to the "Product" section and navigate to your particular model or use the search feature at the top of the page to type in your model number.

Why do I need a bathroom exhaust fan?
Exhaust fans provide ventilation, helping to clear the room of steam and odors. Properly ventilating a bathroom helps deter the growth of mold and mildew by ventilating excess humidity from the room.
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How do I determine what size exhaust fan I need / How much ventilation do I need?
Although there are many factors that will determine what size exhaust fan you need, as a general rule, take the length times the width of your bathroom to come up with the square footage. Assuming the ceiling height is 8 feet, take the square footage and multiply it by 110% (or 1.1). This will give you the amount of ventilation needed for your bathroom. For instance a 10 foot by 10 foot bathroom with 8 foot ceilings would have a square footage of 100 sq. ft., take 100 times 110% to get 110. You would need an exhaust fan with 110 CFM to properly ventilate the bathroom. Higher ceiling heights will require additional CFM.

What is CFM?
Cubic Feet per Minute. Unit of measure for how much air is exchanged in one minute of time. The higher the CFM the more "powerful" the exhaust fan is.

What is a Sone?
A sone is an internationally recognized unit of loudness. The sones translate laboratory decibel readings into numbers that correspond to the way people sense loudness. Double the sone is double the loudness. In everyday terms, one sone is equivalent to the sound of a quiet running refrigerator in a quiet kitchen. The lower the sone, the quieter the exhaust fan is.

Can I install my exhaust fan directly over the tub or in the shower?
Exhaust fans with a UL listing for installation over a tub or shower on a GFCI circuit can be installed over a tub or in a shower. This applies to most Air King exhaust fans and exhaust fans with light. Units that include any type of heating function to them are not able to be installed over a tub or shower. Check you specific product for more information.
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Does it matter that there is insulation touching my exhaust fan?
YES. Confirm your unit's IC (insulation contact) rating. Most Air King exhaust fans, exhaust fans with light, and heater combination units are IC rated to R40. Check your your specific units rating along with the insulation rating covering the unit. This information can be found on the specification sheet available through this web site. Navigate to your specific model or use the search at the top of the page to find your product.

Does my exhaust fan always need to be installed in the ceiling?
NO. Air King exhaust fans can be installed in a wall. The limiting factor will be the thickness of the wall cavity. Typical construction uses 2" x 4" studs which will limit the number of fans that will fit within this space. Always mount the exhaust fan as high up on the wall as possible. Exhaust fans with lights and units with heating functions should not be mounted within a wall.

Where is the best location to install my bathroom exhaust fan?
Typically a bathroom exhaust fan should be mounted as close to or inside (if rated for tub shower use) to the shower or tub as possible. This will maximize the effectiveness of the unit. Units located in a powder room, should be directly over the toilet.

Can I use a speed control with my exhaust fan?
Only units designed for use with a speed control can utilize one. In general Air King fans should not be put on a speed control. Refer to your specific models specifications to determine if it can.
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What is the best way to duct my exhaust fan?
To maximize your exhaust fan's performance, match your duct size to the original size of the fan’s ducting (do not use a reducer), use the shortest amount of ducting possible, keep the ducting as straight as possible, and if flexible ducting is used, keep it as stretched out as possible to limit the resistance of air flow.

There is water dripping from my bathroom exhaust fan?
This is typically attributed to one of two causes:
1. When hot air is being exhausted from the bathroom into cold ducting, some condensation might form that will travel back through the ducting, into your unit. This can usually be avoided by wrapping the ductwork with insulation, limited the amount of condensation.

2. In cold climates, ice can form on the roof or wall cap. When the hot air from the bathroom travels across this ice, it melts and travels back down the ducting into your unit. This is a more difficult situation to correct and some dripping might occur. To help minimize the dripping, use a roof or wall cap with a backdraft damper and if possible face it away from the normal direction of the wind during the colder months to avoid ice and snow from building up around the opening.

Do I have to exhaust my exhaust fan to the outdoors?
YES. To properly exhaust air, be sure to duct air outside. DO NOT vent exhaust air into spaces within walls or ceilings or into attics, crawl spaces, or garages. A build up of humidity could cause damage to your home.
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My exhaust fan is operating but the air is moving slower than normal?
Check the grill for build up and clean if needed or check for obstructions in the ductwork. A common obstruction is build up in the roof or wall cap such as birds nests or other debris.

My exhaust fan is louder than normal?
This is probably attributed to one of the following:
1. The motor is loose - turn off power to the unit, remove the grill and check that all screws are fully tightened around the motor.

2. The fan blade is hitting the housing of the unit - turn off power to the unit, remove the grill and check that the blade is fully inserted on the motor shaft.

What is make up air?
When the exhaust fan ventilates air out of the room, the amount of air ventilated needs to be replaced, this is called make-up air. If there is not enough make up air, the exhaust fan's performance will be diminished. Typically make up air for bathroom exhaust fan's is accomplished by a gap cut at the bottom of the door entering into the bathroom.

My exhaust fan will not operate?
1. Check that there is power to the exhaust fan. The most common trouble is the circuit breaker is off or there is a blown fuse.

2.Turn off power to the exhaust fan and check that all wires are properly connected. Refer to your specific model's installation instructions for proper wiring instructions.

How do I order replacement parts?
Replacement parts can be ordered from the parts department by calling 1-800-465-7300 Monday thru Thursday 8am to 4pm, Friday 8am to 3pm Eastern Standard Time.
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