Well, one solution is run the dryer inside an airlock chamber. Alternatively, if your goal is to simply avoid using your already-heated household air for primary combustion air for the burner, there is an economical and commonly-employed approach. Run a second 4″ diameter duct to convey outside air to the burner. Typically, this air supply duct would be connected to the dryer at a side port. You would need to cut the side port in the dryer with a 4″ hole saw. You may also want to install a manually-operated flapper inside the duct that you could close when you’re not using the dryer.

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