Replacement Filters By Model   Respiraide 300T Pre-Filters Saviair 500 Pre-Filters Saviair 5000 Pre-Filters Protect-Air 3000 Pre-Filters Protect-Air 100 Pre-Filters All VOC filters for all models must be replaced every 6 months (S500 VOC's are changed every 4-6 months) For Filter Prices, call the service department at 519-963-0177