Upgrade bathroom exhaust fan with the RE70BN kit – 70 CFM airflow at only 3.0 sones, reducing noise by 50% while delivering up to 40% more power for select 50 CFM fans. Includes pure copper motor, blower wheel, mounting plates, grille, and hardware for quick 10-min installation. Works with 7-1/2" x 7-1/4", 8" x 7-1/4", and 8-1/16" x 7-3/8" housings. Not compatible with 8" x 8-1/4" housings—please check your fan housing dimensions before ordering to ensure a proper fit. Compatible with: 633-G, 633-H, 633-J670-G, 670-H, 670-J 671-G, 671-H, 671-J 689-G, 689-J, 689-KN671, N688, 6950690-A, 690AC, 690NT-A688-G, 688-H, 688-J, 688-KEC50, ECF50, EC70, ECF70, ECH600, E050, E070695, 695P, 695C, 695CB, 695-R01, 695-R02, 695-R03696N, 696N-R01, 696N-R02, 696N-R03, 696ND-B, 696NC, 696NCB, 696N0, 696-NE Not Compatible With? 670-A, 671-A689-A, 689-B, 689-C, 689-D663-A, 663-B, 663-C, 663-D, 663-E688-A, 688-B, 688-C, 688-D, 688-E