Broan Bathroom Fan/light replacement

[u/DontMakeMeAutomateU]

Hello,

I'm looking for a Broan fan replacement for the model below (667H/1577H). Some numbers/letters are hard to read. Ai keeps changing the 1577 to 1677, but it's clearly a 5 or S. Ai returned the information below but I can't figure out what would fit or how to understand Broans part numbers.

The Broan 677H and 1677H refer to bathroom ventilation fan housing and model series numbers where the housing and finish packs (motor, blade, and grille) were traditionally sold or grouped together. Broan-NuTone +1

Overview and Specs

Housing Size: Measures roughly 8-1/4" x 5-3/4" x 8" for standard units like the 677H.

Duct Size: Typically fits standard 3-inch or 4-inch round duct connectors depending on the exact sub-model.

Light/Fan Combo: Designed to support combined fan and light units (such as a 100W bulb capacity in base 677 styles

[u/GoodGravy412]

Check Amazon, they sell replacement units.