What does CFM mean?
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.
What is a Sone, and how is it measured?
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
What is continuous ventilation?
ventilation provides today?s airtight homes with a relatively constant
and controlled lower level of ventilation. Broan's extremely quiet and
efficient QT Series is ideally suited for these applications.
Can I mount Broan fans above my tub and shower?
Most Broan fans are rated for use over a shower or bathtub with a GFCI (Ground Fault Circuit Interrupter).
Can my ceiling fan be surrounded by insulation?
Broan bath fans are designed to provide adequate cooling for motors and
lighting, as well as products with integral heaters.
Will Broan Fans work in wall-mount applications?
Broan 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.
Will a ceiling fan or wall-mount utility fan serve as a range hood?
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.
What does "static pressure" mean?
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.
How long should a bath fan run after a shower is used?
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.
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.
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 the option of humidity sensing, or timer
control. Just set it and forget it.
What are the timer features?
timers automatically shut your fan off after a specified time interval.
It?s a nice feature in high traffic bathrooms where you may wish to let
the fan run to clear moisture adequately. A timer counts down the
minutes of fan operation selected by the user.
Where should the exhaust fan be located?
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.
Where is the exhaust outlet on the ventilation fan?
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.
Why do the windows and mirrors fog even when the fan is running?
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 significantly
reduce the ability of the blower to remove moist air. Make sure your
ductwork is as short and straight as it can be, with gradual turns
rather than tight corners where necessary.
Why is water dripping from the grille of the fan?
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
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.
Can I use an inline or multi-port fan in one large bathroom?
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
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.
What type of exhaust fan is recommended for hot tub areas?
A high CFM rated device is normally recommended for this type of application.
Can I use a smaller diameter duct than what the fan is designed for?
is not recommended. It will cause the fan to run harder, greatly
reducing the CFM performance of the fan and create excess noise.
Can larger diameter ducting be used with my bath fan?
Yes, larger diameters will result in improved performance.
What type of duct is recommended, rigid or flexible?
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
Can I exhaust my fan into my attic instead of out the roof or wall?
exhaust air into spaces within walls, ceilings, attics, crawl spaces or
garages. The humidity may damage the structure and insulation.
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.
Can I use a fan in a steam shower?
No. Since these are normally sealed chambers, a vacuum will be created.
Can I vent more than one bath fan out of a roof or wall cap?
No. Always follow the manufacturer's recommended ventilation requirements.