How to size bathroom fan

Tam asks, What size exhaust fan should we use in our small bathroom ? Use our handy online calculator to see what size bathroom vent fan you need for your home. First you need to measure the size of your bathroom. To use our fan selection tool (located in the search area to the right of every page) this measurement needs to be in metres.

Bathroom exhaust fans , or vent fans , do two important things: they remove hot, moist air and they remove odors.

Hot, moist air leads to mold growth, and odors lead to general unpleasantness.

Determine the size of your bathroom with this formula: .

To convert centimetres (cm) into metres (m), you need to divide by 1e. The effectiveness of the fan will be rated in CFM, or cubic feet per minute of air moved. Watch this video for tips on how to determine the correct size ventilation fan you need for your bathroom , based on the bathroom size and airflow of the fan.

The proper bathroom exhaust fan should be selected on the basis of performance, style and features. Having the right size for your bathroom is very important!

Bathrooms with higher ceilings and larger dimensions require more powerful fans to keep moisture and humidity at appropriate levels. Wiring regulations, Bathroom Zones and Extractor Fans 2. As the trend to larger spa-like bathrooms continues to gain in popularity, the need for proper ventilation becomes more important. Ideally, the fan should recycle the air in the bathroom eight times an hour.

This is measured by the number of Cubic Feet per Minute (CFM) that the fan moves.

Make sure the fan you choose is powerful enough to ventilate your bathroom. Use the room size to determine the necessary cubic feet per minute (CFM) rating of the fan. The CFM rating measures the volume of air the fan moves.

The first step in determining what size exhaust fan is neede is to calculate the volume of the room. Lubricate the fan with silicone . Medium- size bathrooto CFM. Also note the size of your old fan.

Add another $2to $5for professional installation by an HVAC contractor.

More complicated bathrooms require more fans : one for the water closet, one for the jet tub, one for the shower, etc. The size fan that you need may increase for complicated duct runs. The quietest bathroom exhaust fans are rated for 0. Buy Bathroom Extractor Fans at Screwfix.