edmontondown 发表于 2013-1-2 23:56 v4 U) b3 t- R% T
yes, may have something fell down on the other end of the hood vent
! w$ ~( [; ~9 C! Q/ M2 }At 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.