I replaced 2 construction fans with this one. One in the large master bathroom and one in the guest bathroom, both on the second floor with access to the attic. The one in the main bathroom was much smaller. I believe these fans are a 9 1/4" square with a 4" exhaust, and the one I had in the master bathroom was an 8" with a 3" exhaust. Earlier, after my wife and I took a shower in the morning, condensation would form. which drips from the walls near the shower in the morning and it was difficult to talk to each other when either of us was in the changing room next to the bathroom. Once installed, the noise reduction was noticeable and gone. We're also moving, probably from the fan to 50cfm with a SON rating of 5-6 I think (builder class). Drywall, which was easy. The second bathroom was a bit trickier. You will notice that it is attached to a stud through the wing lugs. I didn't look at my previously installed fan, but it was centered between the studs with metal braces. So I had to make a wooden brace to make room for the room. It's also less noisy, but it's a smaller bathroom. So the fan noise is a bit more noticeable than our main bathroom. Even less noisy, but something to watch out for if you're looking for something that won't be heard in a small bathroom. I'm happy for the fans. They're much quieter than regular fans, make a lot more noise, and don't cost $120 per unit like more expensive fans. It's a bathroom fan, after all, and I don't need anything at all. The shower and other bathroom noises are louder than the fan and they move more air than crappy build quality fans without costing $120 per unit for the same CFM. For reference, I also installed both from the attic. On the second floor, both mines were screwed into studs for support. In general, the installation isn't difficult, but you'll need romex thru-nuts, screws to install the fans to the supports (I used the existing screws for the fans), some ducting to seal the ducts, an optional adapter, and maybe some ratchet straps to attach. channel insulation. I can remember that spontaneously. I'm also not a reference professional, just a master do-it-yourselfer.
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