50CFM Compatible with Broan 663/688 Fan【Not Fit 688-G/H/J/K】. Compatible with Broan 663B/688B 663C/688C 663E/688E 670. Also fits other models with fan assemblies of the same size689-A,B,C,D 671-A(70CFM).Based on confidence in quality, the manufacturer offers a 3-year manufacturer defect replacement service for all fans sold. 110CFM, 3.0 Sones, Compatible with all fans with the same 8-1/4"x8-1/8" blade. S97012029. Upgrade: The upgraded pure copper motor has a higher cost and more stable quality than the original aluminum plated copper motor more than a decade ago, and the life is significantly improved. Motoasis is a professional manufacturer of all kinds of motor fans, we always insist on high-quality technology and materials to provide you with excellent products. EASY TO INSTALL: The fan module is very easy to replace and can be replaced in less than 10 minutes with simple tools. Replacing the fan with a new one will make your bathroom quieter and keep the air fresh. MORE DURABLE: The new fan motor has a minimum of 20 years of service life, and a single replacement will completely solve the trouble you're experiencing. PERFECT EXPERIENCE: S97012029 The fan assembly features high speed rotation and low noise. Faster wind speed and higher airflow. Achieve better ventilation, deodorization, dehumidification and heat dissipation. 【Upgrade】 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