Tools
![Allowable Duct Length Calculator](https://www.broan-nutone.com/getmedia/558abb35-7f62-410d-b71e-3ce4d03ed6bd/Duct-Length-Calculator_310x310.JPG?width=310&height=310&ext=.jpg)
Allowable Duct Length Calculator
This easy-to-use, flexible tool calculates maximum allowable duct length to hit a given delivered cfm airflow level based on basic inputs: CFM required, fan model, duct diameter, duct type (flex or rigid) and number of elbows.
Get Started![Attic Ventilation Estimating Tool](https://www.broan-nutone.com/getmedia/ce305bae-2a9c-451b-9deb-f22f9e146194/gable-detailed.png?width=400&height=400&ext=.png)
Attic Ventilation Estimating Tool
Use this tool to estimate the ventilation needs for your attic and get a list of Broan attic ventilation product that will meet your needs.
Get Started![Range Hood Make-Up Air Damper Specifier](https://www.broan-nutone.com/getmedia/ecc22d41-1a85-4d1d-b5d0-ab75fce66fa1/Make-up-air-damper-2.jpg?width=310&height=310&ext=.jpg)
Range Hood Make-Up Air Damper Specifier
With our Make-Up Air Specifier tool you can specify equipment designed to provide for the home’s Make-Up air needs and designed to be compliant with the latest codes and regulations. Use this tool to make your specification job easier. As a rule of thumb most codes require make-up air at 400 CFM of range hood exhaust (HVI rating at 0.1” static pressure).
Get Started![Find the Upgrade That Fits Your Fan](https://www.broan-nutone.com/getmedia/28287c75-2f1b-4ad7-98e3-833314a59781/Bath-Fan-WIzard.JPG?width=492&height=304&ext=.jpg)
Find the Upgrade That Fits Your Fan
Use our Bath Fan Wizard to fit the right upgrade grille/cover to turn your current fan into a quiet odor eliminator, a light, a Bluetooth speaker, or even a piece of décor.
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