What is this outside vent for?

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Firewoody

New Member
Feb 20, 2022
3
Minnesota
Hello,

So we recently moved into a house with a traditional open wood-burning fireplace. My only experience with a fireplace is as a child so my knowledge is understandably limited.

Can anyone please tell me what the vent in the attached photo is for? I can’t figure out how it would provide air to the firebox. Does it serve some other purpose entirely? Like circulating air under the house?

Cheers!

[Hearth.com] What is this outside vent for?
 
Is this a zero-clearance fireplace in a chased enclosure?