Apron Vent AB20 - Ventilated Apron Vent

The VENT Apron Vent is a Polypropylene Vent which enables warm air to escape from the lower roof void or through the barge detail of a mono-pitch skillion roof. The AB20 has an adhesive and flexible aluminium flashing which is designed to form to roofing profiles and prevent water ingress on any pitch roof.

The AB20 form part of a passive ventilation system that works year round with no moving parts or energy consumption.

  • The AB20 is designed to be compatible with roof cladding profiles with a trough depth of <38mm.

  • The Apron or Barge flashing sits over the top of the AB20 and fixed.

  • BRANZ Appraised


  • It comes in 1.2 metre long
  • 12 pieces (14.4 LM) per Carton

Physical Properties

Property Value
Dimensions 20mm thick x 1200mm long
Total LM per Carton 12 pieces (14.4 LM) per Carton
Calculated Passive Air Flow 8,000mm² per LM
For Trough Depths Less than 38mm
Recommended Ridge Flashing size Minimum 200mm to conceal soft edge of Apron Vent
Vent size 4mm
Material Polypropylene with Butyl Flashing tape
Warranty 30 years
  • Between 17mm and 25mm contact with the trough is required, depending on the cladding profile.
  • Minimum working temperatures to dress down the soft edge flashing is 5°C. Primer or heat gun is recommended below 5°C.
  • Additional fixing screw lengths is required to accommodate 20mm thickness of the AB20.