The customer must pay for the DISKFAN®’s, glassware and replacements parts with a credit card at the time of purchase. Special contract arrangement can be made with E.F Cook & Associates/Diskfan to order and pay for the DISKFAN®’s, glassware and replacement parts for larger orders. Approved orders cannot be cancelled or rescinded after the DISKFAN® assembly started. Custom built DISKFAN®’s cannot be returned. Glassware and replacement parts can be returned, new and unused, properly packaged in the original cartons, with shipping prepaid by the buyer. Refund amounts will be the original cost of the returned parts less a restocking and handling fee of 25%.