Omni Calculator

Cathedral Roof Airway Height & Venting Calculator

Creator

999469v7r7

Inputs

Roof pitch (rise per 12 inches run)

Roof length (eave to ridge)

Rafter spacing

Rafter width

Airway height

Insulation R-value

Conditioned space temperature

Outputs

Venting needed for infinite airway/attic (per running foot)

Venting needed for configured airway (per running foot). This is blank if the configured airway is insufficient (friction losses exceed head available at minimum airflow)

Details

Slope (tangent of roof angle)

Sine of roof angle

Minimum airflow (ft³ / min)

Minimum airflow velocity (ft / min)

Hydraulic Diameter

Reynolds Number

Head lost to airway friction

Head available due to roof slope

Some fields may look different because this is in beta mode. Thank you for your understanding 🙇‍♀️

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