National Ventilation Monsoon IP45 ZONE 1 Silent Fan Timer | MONS100T The Monsoon Zone 1 Silence range is the latest innovative domestic ventilation solution. Providing high extraction rates with low energy use and exceptionally quiet running levels, the Monsoon Zone 1 Silence range is now even better. The bathroom fan comes with a long-life ball-bearing motor and a silent back draft shutter preventing air from travelling back up the duct and into the room.
