edmontondown 发表于 2013-1-2 23:56 9 r; X* j3 B4 b# v1 q8 ayes, may have something fell down on the other end of the hood vent
1 R% A; q( h( X6 xAt 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.