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How do I determine which vent fan I need?

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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Related Questions

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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Can larger diameter ducting be used with my bath fan?

Yes, larger diameters will result in improved performance.

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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 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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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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