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 Raid fogger treats an entire room with residual killing action against roaches for up to 2 months.The roach fogger covers an area of up to 5,000 cubic feet and can even dissipate into closets and small areas within a room. Read directions carefully before using this insecticide fogger and do not use more than one can treatment per room.