In original packaging item, may require some assembly. See link for more details:

Size: 50CFM

Model: 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) S97012029

Note: Cannot test due to hardwiring requirements. 7 days to return if does not function. See pictures for details.

https://www.amazon.com/%E3%80%90Upgrade%E3%80%9150CFM-Compatible-Bathroom-Replacement-S97012029/dp/B0D9CPYPC8/ref=sr_1_1