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What's that air vent in my roof

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  • May 31st, 2021 1:26 am
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[OP]
Deal Addict
May 23, 2006
1531 posts
562 upvotes
Vancouver

What's that air vent in my roof

See picture

I know the vents on the right are for the following: Bathroom exhaust, dryer vent, and plumbing vent

I am not sure what are the square-shaped vents in the middle? anyone can advise?
FYI, I do have central air conditioning and HRV. I think HRV needs 2 x vents - one for air intake and one for air exhaust. Does central air conditioning need multiple vents?

Thanks
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6 replies
Deal Fanatic
User avatar
Oct 16, 2008
9986 posts
4273 upvotes
Vaughan
Attic vents? To get fresh air from outside in and circulate hot air in the attic out.
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Deal Fanatic
Nov 21, 2013
8045 posts
9022 upvotes
Montréal
Both above are right. Attic vents, venting the attic preventing moisture to get trapped there causing mold and structural issues. No venting can trap hot air leaking from the inside during winter meeting cold air making condensation, and, later, mold. It helps keeping the roof deck colder during summer days, saving roof shingles.
Deal Fanatic
Aug 29, 2011
8435 posts
5315 upvotes
Mississauga
teoconca wrote: To get fresh air from outside in and circulate hot air in the attic out.
Strictly speaking they're exhaust vents to let hot attic air out. The cooler air generally comes in via the soffit.
Deal Addict
Apr 26, 2003
2279 posts
1336 upvotes
GTA
mrweather wrote: Strictly speaking they're exhaust vents to let hot attic air out. The cooler air generally comes in via the soffit.
Agreed.
[OP]
Deal Addict
May 23, 2006
1531 posts
562 upvotes
Vancouver
Thanks everyone. this is helpful.

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