High Level Vent Calculator

Calculate the required ridge vents for your roof

Type of roof:

Length of longest side of roof in meters (LS):

BAL rating:

Low Level Vent Calculator

Calculate the required low-level vents for your roof

Type of roof:

Roof cavity:

Angle of roof:

Facia length in meters:

Barge/Parapet/Abutment lengths in meters:

BAL rating: