Broan, S3525, Part, REFLECTOR Genuine Broan Parts meet rigid engineering and test criteria and are equal in design to your original Broan unit. Replacement parts made by other manufacturers might not last as long as Broan parts and typically aren't built to your unit's exact specifications, which could lead to problems and/or other part replacements. It is also important to note that using anything other than Genuine Broan Parts will automatically void the warranty.
I switched to Broan because I buy quality things. I will never go to any other again. Best thermostats & accessories I have ever owned!!!!