edmontondown 发表于 2013-1-2 23:56 % E2 _/ V9 q3 M1 Ayes, may have something fell down on the other end of the hood vent
: `" K& Y: E- N. P4 M. t4 z8 |At the other end(outside) of the vent duct, there is usually a metal cover for the opening, it can swing up and down and if it is a windy day, it will be blown swinging, thus making a kind of banging noise.