QUESTION: Do you have the filter for this item p/n 20228 ANSWER: Yes, we do carry the part for sale. You can order it online as shown on this page. For more discussions, options and details about the product, or to order the product, please click here This low air loss mattress provides effective therapy for all stages of pressure ulcers. It consists of super lightweight control unit and therapeutic support surface providing low air loss. Shipping is free. The Control Unit Simple dial adjustment for patient comfort. Max. setting inflates in seconds. Programmed never to exceed 32mmHg inflation pressure for optimal therapy. CPR quick release for rapid deflation. Compact, lightweight and provides low air loss. 2 year limited warranty. The Therapeutic Support Surface For reduced maceration, low air loss is provided throughout all sixteen air cells of support. All air cushions are constructed of high quality and very pliable coated nylon for low shear and even lower interface pressures. Convoluted foam base provides additional safety to your patient. Modular design facilitates interchangeability, cleaning and setup. The PLEXUS® Quilted Top Sheet is highly vapor permeable and oversized providing a low friction, low shear barrier against complications due to moisture. Machine washable. The therapeutic support surface is lightweight and made of high quality materials. It conveniently rolls up for easy carrying with attached straps. Optional carrying case also available. 1 year limited warranty. The Control Unit Power: 120V~, 60Hz, 5A; / 220V~, 50Hz, 2.5A Weight: 8.5 lbs. Size: 5" x 10" x 12"   The Mattress Length: 80" Height of Cell: 8" Width: 34" Weight: 15 lbs. Weight Capacity: 350 lbs.