Bathroom fan and blown-in insulation

Old 05-28-19, 12:26 AM
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Bathroom fan and blown-in insulation

I'm finishing a renovation project on my main upstairs bathroom. This bathroom has a window and has never had an exhaust fan installed. I'm in the process of installing an exhaust fan. I will vent the fan out the roof using insulated duct.

Our attic floor is covered by 12-18 inches of blown-in insulation over what I believe to be a thin layer of rockwool insulation (just based on internet research). I've dug down through it, cleared a space on the drywall, cut the opening for the fan, wired it to the switch.

My question is whether I need to build some kind housing around the fan to protect it from the blown-in insulation. I know the fan will draw air from the house and vent it out the roof vent, but it still seems questionable as to whether I should just bury the fan unit itself in blown-in after finishing the install.

Any thoughts as to a best approach?

In case it's relevant, this is the fan I'm installing:

Thanks in advance!

Last edited by cbentley; 05-28-19 at 01:18 AM. Reason: Add some additional info.
Old 05-28-19, 11:14 AM
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Welcome to the forums.

Most of my installs are done with standard insulation batts and they lay directly on the fan.
When I have an installation in blown-in insulation...... I use a piece of thin plastic over the fan and then allow the insulation to cover over the plastic. It keeps the dust from coming in the little holes in the housing.

It's your choice..... the fan is rated for direct insulation contact.

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