Ventilation Fans

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How do I determine which vent fan I need?

Bathroom size determines CFM needed. To determine the approximate minimum CFM needed for your bathroom, determine the square footage (length x width). Multiply that number by 1.1 for an 8 foot ceiling; multiply by 1.25 for a 9-12 foot ceiling; or multiply by 1.5 for a cathedral ceiling, and round up.

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Why does my lamp flicker and turn off?

A Metal Halide, florescent, or specialty bulb may flicker and turn off during the first 100 hours burn in period. A normal house hold bulb may acturally burn filiment off the outside of the glass as well.  Let everything cool down and restart. 

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Where should the exhaust fan be located?

  Exhaust fans should be located in or near the shower or tub, and in an enclosed water closet. Keep exhaust points opposite the supply air source to ensure that the fresh air is drawn through the room. Bathroom doors should not be sealed too tightly at the bottom in order to allow “makeup air” to enter the room when the door is closed.

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Can my ceiling fan be surrounded by insulation?

  Yes. NuTone bath fans are designed to provide adequate cooling for motors and lighting, as well as products with integral heaters.

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Can I install a heater over the bathtub or in a shower?

  No. Heaters are not UL Listed (Underwriter’s Laboratory) for installation over a bathtub or in a shower.

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Does a duct-free bath fan expel air?

No. A duct-free fan is not a ventilating device. It does not remove air from the room.

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What does CFM mean?

CFM is the acronym for Cubic Feet per Minute — the measure of air volume moved by the fan blower. Choose a fan with a CFM rating appropriate for your room size to ensure adequate ventilation.

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What is a Sone, and how is it measured?

A Sone is a measurement of sound in terms of comfortable hearing level for an average listener.The lower the sone value, the more comfortable the listening environment. Sones are not decibels or volume, but rather how sound is “sensed.” One sone is the equivalent of a quiet refrigerator.

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Can a Ventilation Fan be Used Over a Bathtub or Shower?

Yes, provided it is protected by a Ground Fault Circuit Interrupter (GFCI). Keep in mind, however, that any ventilation device located in a damp environment may have a reduced life due to high humidity and a potential for corrosion. Fans used in high-humidity areas should be operated for longer periods of time, to ensure the removal of moisture and to reduce the potential for condensation in the fan body or ducting.

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Why does the color of my lamp differ from other lamps of the same Kelvin?

 All manufacturers vary slightly in color from Kelvin to Kelvin. Different bulbs also act differntly.  Have you ever seen some florescent lights start right away, while others flicker before they turn on?  Metal halide lamps require up to 100 hours to burn in set to the right color temperature.  Bulb specialists generaly recomend purchasing a meager amount of surplus replacment bulbs, when re-lamping an application.  This simply means that if you need 4 lights for you...

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What type of duct is recommended, rigid or flexible?

It is recommended, where possible, to use rigid duct. It has less resistance to air flow and allows the fan to operate much more efficiently. If flexible duct is used, be sure the duct is as straight as possible.

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Can a Bathroom Ventilation Fan be Used Above a Kitchen Range?

No. Fans installed above kitchen ranges must be listed for that application by UL, and must be designed to handle grease and high temperatures. An alternate approach is to use a ducted range hood or downdraft exhaust, and a bathroom ventilation fan to exhaust the general odors and moisture in the kitchen.

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Why is water dripping from the grille of the fan?

Dripping water is either condensation (usually due to cold ductwork or improper duct installation), or a problem with the seal on a wall or roof vent. Insulated ductwork can help solve condensation problems, and running the fan longer will ensure moisture is completely removed from the duct. Ductwork should slope down toward a wall vent to direct condensation out of the exterior vent opening rather than back into the fan housing.

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Can I exhaust my fan into my attic instead of out the roof or wall?

Never exhaust air into spaces within walls, ceilings, attics, crawl spaces or garages.The humidity may damage the structure and insulation.

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How long should a bath fan run after a shower is used?

    The Home Ventilation Institute recommends that a fan should be left on for 20 minutes more to clear humidity adequately and to ensure moisture and condensation in the fan body or ducting is minimized.

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Why do the windows and mirrors fog even when the fan is running?

If windows and mirrors are very cold, condensation can still form on these surfaces. And if your bathroom is sealed tightly, replacement air may not be entering the room fast enough to displace the moist air. Be sure to undercut your door sufficiently to draw fresh air into the room. Fan placement can also be a factor.Your fan should be located far from the replacement air source to ensure the moist air is drawn out first. Finally, too many twists and turns in the ducting will significant...

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Can larger diameter ducting be used with my bath fan?

Yes, larger diameters will result in improved performance.

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Can I use a smaller diameter duct than what the fan is designed for?

This is not recommended. It will cause the fan to run harder, greatly reducing the CFM performance of the fan and create excess noise.

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What is continuous ventilation?

Continuous ventilation provides today’s airtight homes with a relatively constant and controlled lower level of ventilation. NuTone’s extremely quiet and efficient QT Series is ideally suited for these applications.

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Why is water dripping from the grille of the fan?

Dripping water is either condensation (usually due to cold ductwork or improper duct installation), or a problem with the seal on a wall or roof vent. Insulated ductwork can help solve condensation problems, and running the fan longer will ensure moisture is completely removed from the duct. Ductwork should slope down toward a wall vent to direct condensation out of the exterior vent opening rat...

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What should I do if I can’t wait for moisture to clear, but I don’t want a fan to run all day long.

  NuTone has sensing fans that detect the humidity rise caused by a shower and turn on automatically – when moisture has cleared it turns off. Some wall controls also give you theoption of humidity sensing, or timer control. Just set it and forget it.

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What type of exhaust fan is best for a sauna or hot tub area?

  High CFM-rated devices are normally recommended for this type of application.

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What type of duct is recommended, rigid or flexible?

It is recommended, where possible, to use rigid duct. It has less resistance to air flow and allows the fan to operate much more efficiently. If flexible duct is used, be sure the duct is as straight as possible.

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What is Static Pressure?

Static pressure is a measure of the resistance against airflow as the fan pushes air through a duct. It is measured in inches of water column or water gauge, such as 0.25" w.g. to show that resistance is equal to a column of water gauge. It is expressed as 0.1" w.g. or 0.25" w.g. to show that the resistance is equal to a column of water one-tenth or one-quarter of an inch tall.

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Where is the exhaust outlet on the ventilation fan?

The exhaust outlet is the point where air is discharged through the body of the fan housing into the ductwork. During installation, orient your fan with the exhaust outlet pointing toward the exit vent on your roof or wall to minimize turns in ductwork that impede airflow.

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Will NuTone Fans work in wall-mount applications?

  Some NuTone bath and utility fans may be wall mounted. See the spec matrix for specific models. Improper installation may affect fan life, safety and your warranty.

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I don't understand Ventilation. Can you help me?

Principles of Heating and Cooling Understanding how heat is transferred from the outdoors into your home and from your home to your body is important for understanding the challenge of keeping your house cool. Understanding the processes that help keep your body cool is important in understanding cooling strategies for your home. Principles of Heat Transfer Heat is transferred to and from objects—such as you and your home — via three processes: conduction, radiation, and conv...

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Can I use an inline or multi-port fan in one large bathroom?

  Yes, this works the best for large rooms because you can install the ports over the areas where the ventilation is needed the most (source control).The size of the multi-port would be determined by the size of the room.

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Nutone

Since their beginning in 1936, NuTone has pioneered many of the product innovations now established as standards of the industry. In 1998, Nortek acquired NuTone, adding it to the Broan Group. Today, Broan-NuTone carries on the commitment.

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Can I vent more than one bath fan out of a roof or wall cap?

  No. Always follow the manufacturer’s recommended ventilation requirements.

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Will a ceiling fan or wall-mount utility fan serve as a range hood?

  No. Range hoods are specifically designed to handle grease and high temperature environments. Ventilation provided by NuTone fans is only a supplement for odor and moisture removal in the kitchen.

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Can I use a smaller diameter duct than what the fan is designed for?

This is not recommended. It will cause the fan to run harder, greatly reducing the CFM performance of the fan and create excess noise.

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Why do the windows and mirrors fog even when the fan is running?

If windows and mirrors are very cold, condensation can still form on these surfaces. And if your bathroom is sealed tightly, replacement air may not be entering the room fast enough to displace the moist air. Be sure to undercut your door sufficiently to draw fresh air into the room. Fan placement can also be a factor.Your fan should be located far from the replacement air source to ensure the m...

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Will NuTone Fans work in wall-mount applications?

  Some  bath and utility fans may be wall mounted. See the spec matrix for specific models. Improper installation may affect fan life, safety and your warranty.

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Can I mount NuTone fans above my tub and shower?

  Most NuTone fans are rated for use over a shower or bathtub with a GFCI (Ground Fault Circuit Interrupter).

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Does a duct-free bath fan expel air?

No. A duct-free fan is not a ventilating device. It does not remove air from the room.

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Where should the exhaust fan be located?

Exhaust fans should be located in or near the shower or tub, and in an enclosed water closet. Keep exhaust points opposite the supply air source to ensure that the fresh air is drawn through the room. Bathroom doors should not be sealed too tightly at the bottom in order to allow “makeup air” to enter the room when the door is closed.

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Which Ventilation Fan Should I Choose?

1st You Will Need To Size UpYour Fan: Properly sized ventilation in airtight homes and apartments helps to assure healthy indoor air quality. Both intermittent (spot) ventilation and continuous (whole house) ventilation should be considered.Intermittent ventilation is used to exhaust sources of moisture and odors, while continuous ventilation is used to remove accumulated indoor air pollutants. Ventilating fans should be located near the source of moisture and indoor air pollutants in ...

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Can I exhaust my fan into my attic instead of out the roof or wall?

Never exhaust air into spaces within walls, ceilings, attics, crawl spaces or garages.The humidity may damage the structure and insulation.

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What does “static pressure” mean?

Static pressure is the measurement of airflow resistance as it is pushed through ductwork which reduces the effectiveness of the fan. Learn more on the Home Ventilation Institute web site www.hvi.org.

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Can I use a fan in a steam shower?

No. Since these are normally sealed chambers, a vacuum will be created.

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What is the difference between a mogul base and a medium base?

Mogul bases are the standard for single ended (SE) metal halide lighting. Medium base is very similar to a household incandescent socket and is usually only available for lower wattages. 

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