raid concentrated fogger 1.5 oz - 4 pack hao raid concentrated deep reach fogger uses a bug killing fog to kill roaches and fleas in the hard-to-reach areas of your home. the fog treats an entire room with residual killing action against roaches for up to 2 months. the fog covers an area of up to 5,000 cubic feet and can even dissipate into closets and small areas within a room.