Knightsbridge: EX1TBK, 100mm Extractor Fan, Low Noise, Adjustable Timer, IP45, 230V, 24 l/s, Black FinishIntroducing the IP45 100mm 4 inch Extractor Fan designed for optimal ventilation in your space. Low noise level: Just 28. 5 dBA at 3m IP45 rated: Suitable for Zone 1 installations Adjustable overrun timer: 2 30 minutes (preset for 2 minutes) High extraction rate: 24 l s (87m3 hr) Easy to clean and install on walls ceilings Built in back draft kit for enhanced functionality Double insulated: No earthing required Compliant with the latest Building