I am about to fit an extractor fan in the kitchen. It's a conventional Eli= ca unit (with filters) and has an external fan. The duct goes up from the = extractor, runs for 3 metres horizontally (between the joists, above the ce= iling) and then out through an external wall into the fan unit (mounted out= side). The duct will be the flexible sort (150mm) with fibre glass noise i= nsulation round it.
I am worried that the duct will collect water and/or grease etc. Should I = worry about this? What do people do about it? Is access to the duct impor= tant?
thanks for any advice ... Robert