External Muffin Fan, 115V 50/60Hz, 71CFM. Prewired with lug connectors and mounting hardware. This uses the existing fan guard on the rear of the 9500, 8100, 99, 91B and 8410 models (serial number 0391 and above) NOTE: for mounting on Alpha 8410 serial number 0390 and lower (or 78, 76, 76A, or 374A) see Part Number BLX-X116-8410 below, which includes the rear fan grill.