Ventilators designed to reduce draught and muffle outside noises to the maximum. Daylight does not show through them. Simple three part assembly (cowls - liner - and internal louvre). Designed to be fitted with screws or mastic. All Draughtbusters meet BS 5440-2, BS 493 and BS 5871-3 requirements.
Fits through a circular (127 mm) hole. Equivalent free area of 75 cm².
Through wall length: 300 mm to 380 mm (12" to 15") telescopic.
For appliances up to 22 kW Net - (24 kW Gross).