Specification
Features & Benefits- Telescopic and adjustable for a step of 3, 4 or 5 brick courses
- Horizontal and vertical extension accessories available
- Free area of 8000mm2 per unit when installed without 1201AB airbrick
- Free area of 6500mm2 per unit when installed with 1201AB airbrick
- Equivalent area of 6170mm2 per unit when installed with 1201AB airbrick
- Special grille included to prevent entry of vermin
- Durable, robust and totally resistant to decay