edmontondown 发表于 2013-1-2 23:56 5 ?2 q( k4 W( Z6 a! Z: c5 c7 Kyes, may have something fell down on the other end of the hood vent
- k- N. J- s2 r( K; E) 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.