my basement apartment kitchen is located in the middle of an elongated row house so i cannot discharge kitchen fumes very easily. what i plan on doing is a bipartite system - recirculating hood fan and a wall fan which does blow out.
1. the duct will need to travel about 12 ft outside. what is the highest number of recommended bends the duct should have, for fire safety ? i was planning to have 3, is that too many ?