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How to wire Taco Hydro Air Fan Controller to forced air system FAN only?

From the advice of someone on this forum, I am installing one of THESE controllers to run my wood boiler hook up to my current forced air duct work.

My question is about how to wire this Taco controller to the fan only on the forced air system? Currently there is an oil burner which turns on and fires oil to push the hot air through the duct work. I am trying to set it up to turn the fan only on when my wood boiler is bringing in heat.

Any advice would be appreciated. Here are some photos of what I am trying to hook up to