edmontondown 发表于 2013-1-2 23:56 4 m8 i8 B9 v( R% `
yes, may have something fell down on the other end of the hood vent
0 H2 t' [! n2 O6 H$ Z1 c
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.