Bathroom exhaust fan is a must to vent out the hot moist air after a shower to save your bathroom from moisture and mold. A bathroom fan should have a timer instead of a switch to control it. The air should exhaust continuously for about 20 minutes after you have used the bathroom and a timer will save you from the cumbersome exercise of keeping an eye on the watch and remember to switch off the fan in the bathroom afterwards. These days bathroom fans are quieter and do not make so much noise and it is easy to forget to turn them off after the required run time. Choosing good bathroom fan means to determine that it is capable of achieving 8 air changes per hour and is size appropriate for your bathroom.
Determine the right size of fan for your bathroom by calculating the
CFM (cubic feet per minute) of the bathroom, which means minimum airflow
needed to achieve 8 air exchanges per hour. The formula to calculate CFM
CFM = Volume/7.5, where Volume = Length x Width x Height (of the
Thus a bathroom that is 10 feet long, 10 feet wide and 10 feet high
Volume = 10 x 10 x 10 = 1000
And, CFM = 1000/7.5 = 133.33.
Thus, any fan with CFM listed as 134 or higher is good enough for this
The noise level of the bathroom fan also plays a major role in its
price and our budget. Though, everybody would love to have the quietest
fan for their baths, the budget limit their choices to whatever is
available within their budgets. The noise level of bathroom fans is
measured in SONES. 4.0 Sones is the normal voice of a television, 3.0
Sines is office noise, 1.0 Sone is noise of a refrigerator and 0.5 Sone
is the sound of rustling leaves. 3.0 and 4.0 Sones is quite loud for a
fan but any fan at 1.0 Sone should do well enough in your bathroom.
Install the bathroom fan correctly to keep its noise level down and use
screws in its installation and not nails. Bigger venting with gentle
turns means gradual venting and quieter fans. Sharp bends may cause more
air noise while it is venting.
Looks of a bathroom fan should match with your bathroom decor. Fan may
range from white and brown to several colors and they can have additions
such as a light or a heating element. Premium bath fans look great while
they protect your bath from moisture, steam and odors and provide proper
ventilation in the bathroom and make it airy. Bathroom exhaust fans
today are quite flexible in their designs and on fan can either be used
to ventilate two bats or one remote fan motor can operate several
exhaust grilles for effective spot ventilation in a single bath. For
spot ventilation, ceiling grilles are mounted in the shower, over the
toilet or over the whirlpool tub so that the moist air in the area can
be dissipated quickly and efficiently.
Some of the high-end quality fans come with protective shell made up of
UV-protected thermoplastic resin that can be mounted easily in wet
locations. Smaller baths and powder rooms can use small-scale ceiling
mount grilles with fan motor installed in a remote location, perhaps
away from the bathroom. Fans with 'friendly flex duct' are easy and
quick to install. One must always use insulated flexible duct to reduce
the noise level of the fan and ideally, there should be at least 8 feet
of flex duct between ceiling grilles and fan. Multiple ceiling grilles
or ceiling grilles with lights make your bathroom airier and brighter.
For luxury bathrooms and oversized baths, bathroom vanity fan with spot
ventilation is best that keeps the bath free of mold and moisture.