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How to calculate recommended CFM

Steps to Calculate Ventilation for a Bathroom: 8 ft by 10 ft with an 8 ft ceiling:

Calculate the cubic feet of your bathroom by multiplying length x width x ceiling height 8 x 10 x 8 = 640
Divide that number by 60 (the number of hours in a minute) 640/60 = 10.7
Multiply the result by 8 HVI (Home Ventilation Institute) recommendation for bathroom air changes per hour ACH). 10.7 x 8 = 86 CFM or greater HVI recommend a minimum 86 CFM for this bathroom.
The next step is to calculate the duct run to ensure the selected fan can move 86 CFM of air through the entire duct length to exit the home. Please refer to the Equivalent Duct Length EDL chart located in the sizing section of this website for more details on duct sizing and applications other than bathrooms.

For this example:
12 ft of aluminum flex duct
1 elbow (90 degree bend)
1 termination device (exterior hood)

Length = 12 aluminum flex x 1.25 = 15 ft
Elbow = 15 ft
Termination hood = 30 ft
15 + 15 + 30 = 60 ft EDL

86+ CFM and 60 EDL:

Double click link to Panasonic chart to select a fan with appropriate CFM, EDL and added features

Benefits of Panasonic Bath Fans

Quiet Operation
Panasonic uses totally enclosed DC and AC condenser motors designed for clean, quiet and continuous operation. Additionally, Panasonic blower wheels utilize specially designed fins that reduce noise caused by tip speed or air movement.

Energy Efficiency
Panasonic CFM/Watt are among the lowest in the industry and far exceed ENERGY STAR minimum requirements. Panasonic fans are often selected to meet ENERGY STAR home requirements.

Long Life
Panasonic totally enclosed DC and AC condenser motors remain clean during the life of the fan. A clean motor doesn't vibrate and remains quiet.

Healthy Breathing
Modern homes are built air tight to meet energy specifications. Panasonic fans are often used to provide both intermittent ventilation in the bathroom and continuous run ventilation for whole-house indoor air quality.