356qlb major dust problem

[Baron]

Hi all I have a problem with dust coming into the trailer when on gravel. It seems to be coming from the hot water tank area , fills my sink and drawers and the whole main seating area. Any help on where to check ?
I already spray foamed te hoses comin through the floor in the hwt area.

[fonzie]

Could it be coming from your stove exhaust fan if outside flap is not locked closed?