I have a pellet stove wood burner, it has an external air tube to the fire box. This allows the air to be sourced external to the building; if the building is a mobile home or otherwise tightly sealed. The instructions say if it is used, then run an external metal pipe through the wall 1 5/8 dia and join to the fresh air tube leading to the fire.
Not sure how your boiler fire works, but if the fire box has a forced air fan like the pellet fire, then the hole in the wall isnt very big compared to the size of the room, so any ingress of cool air into the room would be minimal.
Cheers
Mike
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