Submittal Builder

Submittal Builder
COVID-19 UPDATE: Click here to read a message regarding our COVID-19 response plan.

Net Free Area Calculator

Our Net Free Area Calculator will help you calculate the NFA for your project and the necessary vent width for your Metal-Era ridge vents or vented fascia products. For nailbase ventilated roofs, please try our Ventilated Roof System Calculator.


You may run this calculation if you know either the square feet of attic space or the NFA that your project requires.

Roof Details

Run calculation for:
Attic Square Feet:   square feet
Vented Eave Length:   feet
Vented Ridge Length:   feet