edmontondown 发表于 2013-1-2 23:56 6 i7 z* c( x; D+ R7 B0 Y4 B# yyes, may have something fell down on the other end of the hood vent
, q/ D4 \) k3 w* w$ @1 u3 |9 zAt 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.