If anyone is considering installing these in a home, I can strongly recommend it! My house came with some builder grade Broan/NuTone units that sound just terrible when exhausting air. I can't understand how they build them so shoddily given how simple they are in function. Anyway I installed a Panasonic WhisperFit unit in my guest bathroom and it runs beautifully with a literal whisper of noise. I actually intend to leave the fan running most of the time in the warmer months to provide fresh air circulation into the home.