edmontondown 发表于 2013-1-2 23:56 4 `8 r% N: p0 {; b) X( lyes, may have something fell down on the other end of the hood vent
! r6 ]6 [; ?, k, uAt 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.