edmontondown 发表于 2013-1-2 23:56 # p, P* c1 k0 L1 lyes, may have something fell down on the other end of the hood vent
! J, w5 k6 [, FAt 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.