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The ACT mattress support system dynamically channels air to respond to a person's form providing the lowest possible interface pressure all without the use of electrical motors and pumps. ACT2 shown on Invacare 54101/C Bed. Features Specifications No power unit required Portable, lightweight mattress replacement system Waterproof, anti-microbial Ventex Recovery 5" therapy cover reduces friction and shear Durable ballistic nylon bottom protects the mattress from any abrasive surface Dime