I've nothing to add but to say I have noticed, and been perplexed by, the same thing.
Another layer of ceiling may have been installed later.I was replacing a chandelier this morning and I can't help but notice that there are so mang boxes in my home that aren't mounted flush with the finished wall. Is this just poor workmanship or is that how they did it 30 years ago?
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In my experience.Solidify said:Noticed accross pictures of my home or in your experience also?
They are adjustable.What if the box extenders stick too far out past the finished surface?
Uh, most fan boxes are adjustable in case the hole isn't exactly centered.That's a smart product. But it's not worth the 15$ (surely more at HD Canada) in my opinion, especially considering I've seen many of these in my home, the costs will add up quickly. Not to mention, what if the hole isn't nicely centered between the joists? That bar extends outwards but if you can't fit it in between there to begin with, you'd have to use a hacksaw to trim it down. Too much of a headache. These types of products are for single-issue fixes imo. But nice find.