I did a DIY carbon filter for the smell in my flower room, Im using a 6 Inch inline fan rated at 280cfm...problem I have is that the fan doesnt blow thru the carbon,the air doesnt really blow constantly thru the carbon kinda almost bounces off...is this normal? I tried lowering the amount of carbon but still cant cover the entire duct with carbon cause it will bounce off....and even though its bouncing off will it still help with the smell? (I can hardly smell it since im in there so much but other people always complain of house smelling like weed...)