Don't know for sure, but I would imagine that during a fire, with expansion of the trunking, the lid may displace. I know the lid would also expand but with clip-in, it's a thought.
We don't know what brand of trunking he is working with so how can we know whether metal lid is available, or ever was available for that particular brand?
We don't know what brand of trunking he is working with so how can we know whether metal lid is available, or ever was available for that particular brand?
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