what is ventilating air used for on a combustion heater

what is ventilating air used for on a combustion heater. There are some references to what is ventilating air used for on a combustion heater in this article. If you are looking for what is ventilating air used for on a combustion heater you've came to the right place. We have posts about what is ventilating air used for on a combustion heater. You can check it out below.