637004 | 637004 | BROAN-NuTone

637004 Broan-Nutone Replacement Part BROAN-NuTone 637004 is a replacement part for Broan-Nutone bath fans. It is a round plastic exhaust vent cap that fits over the outside vent of the fan. The cap has a built-in damper that automatically opens when the fan is turned on and closes when the fan is turned off. This helps to prevent drafts and keep the cold air out. The 637004 exhaust vent cap is made of durable plastic that is resistant to UV rays and weathering. It is also easy to install and remove, making it a convenient replacement part. Our HVAC supply store offers the best prices and fast shipping for your products!