Rocky
I have double glass in mine works great for sound and heat!
It is two 5mm laminated glass with 3mm space that are filled with argon gas.
Same system as they use in buildings here in Finland.
But it has to be a little bigger and glued in because its so thick.
nor"easter
You can just make a paper template of the opening and then measure the rubber sealing in the trace and take the difference of the template
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