Failed Ceiling Fan Box

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Knuckle Dragger said:
https://www.amazon.com/dp/B000HEHFN...t=&hvlocphy=9001869&hvtargid=pla-318494368493


I have used these plastic fan rated boxes in the past. I would secure the fan bar into the ceiling joist.
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I like those or any fan box that utilize a truss or other structural material for supporting the fan. Saddle boxes are great as well. I still use the Allied Moulded fan/ceiling boxes quite often too. Never had an issue with them and love the tapped threads. Screws go in with ease. One thing for sure........No more nail on plastic fan or ceiling boxes for me.
 
Sierrasparky said:
Well this thread has been an interesting journey.
I have never known that a plastic box's plastic holes were rated for paddle fans. Live and learn every day.
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I think many of us have learned something from this thread.

I couldn't find a single site where they suggested mounting a ceiling fan with a plastic box and 8-32 screws.
 
MAC702 said:
Did that include the manufacturer's product page?

But yeah, I've never mounted one to plastic holes, nor have I ever been tempted to do so.
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That's what I was thinking. This subject is a bit out of my wheelhouse, but the idea of trusting the pullout strength of a metal screw into a plastic fitting to hold up an on axis weight of any significance for 20 years or more makes me very nervous, especially considering how easy it would be to overtorque the screw and therefore drastically reduce its pullout strength.
 
ggunn said:
That's what I was thinking. This subject is a bit out of my wheelhouse, but the idea of trusting the pullout strength of a metal screw into a plastic fitting to hold up an on axis weight of any significance for 20 years or more makes me very nervous, especially considering how easy it would be to overtorque the screw and therefore drastically reduce its pullout strength.
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Have you ever seen torque specs come with a ceiling box?
 
A/A Fuel GTX said:
Have you ever seen torque specs come with a ceiling box?
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No, but what I meant was torquing the screw to the point where the plastic between the threads would begin to fracture. This would greatly reduce the pullout strength of the screw.
 
ggunn said:
No, but what I meant was torquing the screw to the point where the plastic between the threads would begin to fracture. This would greatly reduce the pullout strength of the screw.
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Perhaps you are onto something. Are you listening UL, etal? Would torque specs have prevented this failure? Do they need to be spec'd to get the listing??
 
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