2 x Manrose QF100T "Quiet" Extractor Fans with Timer for 4"/100mm duct
96mm spigot, 83mm long. For connection to 4"/100mm ducting. Incredibly quiet sound output of 27dB(A) @ 3m (60% better than "normal" fans). 21 litres per second, 75m3 per hour extraction rate. Power consumption 4.8W.