DQS-36-3IV / CR-365-3IV (37,252 BTU) View Product DQS-36-IV / CR-365 (36,533 BTU) View Product DQS-40-3IV / CR-405-3IV (40,551 BTU) View Product DQS-40-IV / CR-405-IV (40,578 BTU) View Product DQS-45-3IV / CR-45-3IV (44,500 BTU) View Product DQS-48-3IV / CR-48-3IV (48,600 BTU) View Product DQS-56-3IV / CR-56-3IV (56,400 BTU) View Product DQS-60-3IV / CR-60-3IV (62,200 BTU) View Product