would using an exhaust vent with flaps be a bad idea on a RMH that extracts enough heat?
seems like it could stop your air flow from reversing, and also limit airflow while the RMH isnt being used.
https://www.amazon.com/Lambro-Industries-Plastic-outside-dimensions/dp/B00AFCH78G
only possible issue i could see is that it might make the fire harder to start?
could the last little bit of your exhaust get stuck?