Sizing an exhaust fan

Use these tips to get the sizing right. 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.

Use our helpful Fan CFM (cubic feet per minute) Calculator to help you choose the right exhaust fan or air intake fan for air exchange in your facility. The key variables that do change depending on applications are the fan model and the air volume flow rate ( CFM ).

Other considerations include the resistance to airflow (static pressure or SP) and sound produced by the fan (Sones).

Choose an exhaust fan with CFM (capacity) equal to or greater than the CFM of that space.

This guide will help you understand how to choose the right size and type of bathroom fan. Exhaust Fan Calculator , Calculate Air Exchange For Any Room. Decide whether you are sizing for intermittent or continuous ventilation.

If intermittent, determine which application i. 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. Determine Room Size ( Ft³) (A) = 8. Determine the necessary frequency of ventilation (B).

Bathroom exhaust fans , or extractor fans, come in variety . Identify suitable model for application. Area Method – Derives the ventilation rate from the area of the space (in square feet) to ventilated multiplied by ventilation rate per square foot. Example: For residential bathrooms up to 1sq.

A ventilation fan should meet at least the minimum standard CFM to provide proper exhaust. Before you install bathroom, kitchen or garage exhaust fans, start here to determine what you . Air movement is typically measured in cubic feet per minute ( CFM ). Ventilation rates based upon eight air changes per hour are generally suggested. For most bathrooms this works out to one CFM per square foot of bathroom area. This problem is noted on Checklists with .