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Hello, we are building at the moment and want to have the cooker and extractror on an inside wall.. It is 16 feet to the ouside wall ..... does anybody know if this is too far a draw for an extractor fan.... or is there a make of extractor fan to do this length.. I hear the charcoal extractor fans are not much good... moving the cooker is not an option..
This is done all the time in apartments and should not prove a problem with most fans; the real problem for fans "pumping" this distance is the friction offered by the actual ductwork/ pipe and any bends. You can minimise this by using a proper rigid pipe for the ductwork as opposed to fexi pipe (restrict the use of this to the start or end of the run where possible) as the smooth internal bore offers the least resistance to airflow. 3 and 4 metre duct runs are not uncommon in apartments (for kitchen and bathroom extracts) so I wouldn't worry too much about it. Make sure to seal any joins in the ductwork with silicone and/ or duct tape as appropriate. It's a good idea to lay the duct with a small fall (1: 100) towards the outside as this ensures any condensate will not lodge in the pipe.
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