Thought this might be a good resource for you @rev.hodl This guy did a similar modification to his dryer except pulling from attic air not from the exhaust of a miner. He uses a “TED” to observe the power differential from the two ways. Just thought I would pass it along in case it was helpful.

https://www.johnsavesenergy.com/attic-air-clothes-dryer

https://www.johnsavesenergy.com/ted-the-energy-detective