motoasis ?upgrade? 50cfm fan compatible with broan 663/688?not fit 688-g/h/j/k? 663b/688b 663c/688c 663e/688e 670,compatible with broan 689-a,b,c,d 671-a(70cfm) bathroom fan motor replacement s97012029 / 50cfm is up for auction in Tools & Home Improvement. This item is in New/Like New condition. This auction has ended — similar items appear in live auctions regularly.