• Warranty: 3-year warranty
• Return Policy: 30-day money-back guarantee (no restocking fees)
• Replacement Policy: 90-day replacement policy due to factory defect

Surround Air 3000D, 3000C, 2100, 2000 (the 1000 and 800 have a 1 year warranty)

If you return your purchase within the 30 day money-back guarantee period( there are no restocking fees), and if there was a  free item it must also be returned or your credit will be adjusted to reflect the price you would have paid for the item. If you purchased 2 items to receive a free item (buy 2 get 1 of something free) and you return one (of the 2 purchased) you must return the free item or your credit will be adjusted to reflect the price you would have paid for the free item,  And the price you would have paid had you purchased 1 of the initial item.  

Lets say you buy a Surround Air model that is 1 for 99.95 and  2 at 89.95 each.  You decide to buy 2 at 89.95 each. You return 1 unit, the price you pay will be adjusted to reflect the 99.95 price of the one you keep.