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There was a thread bout this very subject a while back, I think last summer, I couldn't find it can't remembe the exact wording. There is a sealed slide valve the right size to cut off the air between the air filter and intake. It was stainless steel and cable operated. Maybe someone else...

I would wonder if an ordinary blast gate would be air tight enough to block the air flow completely. Most dust collection systems are not very high vacuum levels and rely on high air flows to work. I was looking at these:Positive Seal Blast Gates Of course they are more expensive.

I saw that on TV after it happened. The unloading hose ruptured releasing a cloud of propane that eventually reached the engine, causing it to runaway and explode. It probably would have caused an explosion anyway because it happened at a foundry while it was in operation.

I've seen signs posted on the steering wheel at GSA auctions warning not to start the engine because it would run away. Blown turbo seals is one way this could happen. I've never seen one in person, but Grove cranes have an air shutoff on the inlet to provide emergency shutdown. I saw one...