edmontondown 发表于 2013-1-2 23:56 8 [& Z f* S+ i& [5 @
yes, may have something fell down on the other end of the hood vent
# B- A6 N+ b" k) Z3 S6 HAt 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.