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This is just a low cost concept, I have not invested the $8 required to prove it out. These blast gates are made for dust collection systems that require a lot of CFM and would clog if restricted. It is made of metal and would probably stand up to a run-a-way better than a butterfly gate.

I would think that something would die. The engine, the drive line, the engine and drive line. Please report back how well this works for you.

Craftsman 4 in. Blast Gate, Aluminum A 4in. blast gate may be an easy install and it would cost about $20 for all the parts.