Cutting kiln shelves?

I’m in the process of retrofitting an old electric kiln to gas, I’m using a kiln shelve for making a chimney inside the kiln to make it a down draft kiln. I was wondering if anyone has an easy way to cut old style kiln shelves the ones I have are 3/4 in thick and are like 40 years old so I’m not sure what they are made. Is there something that the space I can use to cut them?
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I would suggest something like this.

https://www.homedepot.com/p/RIDGID-4-5-in-Diamond-Multi-Cutting-Blade-HD-VBMU45/312834942

I would also suggest that a respirator is REQUIRED along with goggles that cover your eyes.

The dust is really bad for you.

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Nice that’s looking like the best way for sure!! I’ll definitely be using a respirator and glasses thank you for your response!!

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