Health Guards® STRATUS® Deodorant fan dispensing systems feature maintenance free dispensers made of ABS plastic, with a side hinge that allows for easy access to replace the refill. Each dispenser deodorizes up to 5000 cubic feet of air. Dispenser motor runs all day. Each dispenser requires a D size battery, sold separately. Stratus refills fit virtually any fan dispenser. Each gel refill provides up to thirty days of clean fresh air. Change the battery with each refill replacement. For best performance, locate the dispenser as far away from any air return as possible, and above eye level.