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Fantech Inline Fans Guide

FAN SIZING FOR BATHS UNDER 100 SQ. FT.
According to the guidelines of HVI (Home Ventilating Institute) baths 100 square feet or smaller require one CFM per square foot of bathroom*. To find the square footage simply multiply the length of the bath by the width.

EXAMPLE
7' x 9' bath = 63 sq. ft.
YOU WILL NEED
A 63 CFM FAN.
* Minimum 50 CFM

NOTE: For proper airflow in typical installations (when duct losses aren’t calculated), use the 0.4”Ps (static pressure) rating point for correct fan selection.

Contractor Friendly Installation
Fantech Premium Bath Fans are “flex duct friendly” making installation fast and easy.
We recommend:
1. Use insulated flexible duct.(Insulated flex duct allows sound from the fan to dissipate gradually so that it can not be heard in the bathroom.)
2. Ideally you should have at least 8 feet of flex duct between ceiling grilles and fan.
3. If applicable, use multiple ceiling grilles or ceiling grilles with lights.

Did You Know??
The Home Ventilating Institute (HVI recommends that “the bath fan be left on 20 minutes after the use of the bathroom” to successfully fight the damaging effects of moisture.
A timer such as Fantech’s Electronic Pushbutton Timer (Model FD60EM) is the ideal answer.
Simply push 10, 20, 30 or 60 minutes then exit the bathroom.
Timer will keep the fan running for the amount of time you specify then turn off automatically.

FAN SIZING FOR BATHS OVER 100 SQ. FT.
Ventilation for baths over 100 square feet is calculated based on the fixtures in the bath.
Allow 50 CFM for each standard toilet, shower or tub. Whirlpool and jetted tubs are calculated
at 100 CFM. Add up the CFMs for all fixtures and you'll have the total CFMs required.

EXAMPLE
11' x 14' Bath = 154 square feet
1 Toilet + 1 Shower + 1 Tub = 150 CFM
1 Toilet 50 CFM
1 Shower 50 CFM
1 Tub 50 CFM
Total 150 CFM
YOU WILL NEED A 150 CFM FAN.

NOTE: Fantech recommends that steam showers use a separate fan on a timer so that the fan
may be shut off during shower use and then run afterward to dry the shower stall.
For proper airflow in typical installations (when duct losses aren’t calculated),
use the 0.4”Ps (static pressure) rating point for correct fan selection.

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