Timloc Telescopic Underfloor Vent

"Adjustable ventilator to provide ventilation beneath suspended ground floors up to 5 brick courses. Telescopic and adjustable for a step of 3, 4 or 5 brick courses 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 Satisfies all NHBC requirements Manufactured to BS EN ISO 9001 and BS EN ISO 14001 Complies with all relevant Building Regulations Meets all relevant British Standards"