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ApparentlyABear t1_jea02j1 wrote

Start with replacing the weather stripping - there are multiple sizes and they are cheap so buy a couple and figure out what size fills that gap without affecting the function of the door.

If problems still persist, the other thing you can do is get an HVAC contractor to come out and check the air balance in your house. If you have negative pressure in your house, you’ll be constantly drawing air from the outside into your home.

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jap5531 OP t1_jea2w4y wrote

This is interesting. What do they do to fix that?

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ApparentlyABear t1_jea4a63 wrote

Usually adjust some dampers. In extreme cases they may need to resize a duct or add dampers to existing ducts. Basically they’re measuring how much air is getting sucked into your HVAC unit and how much air is getting pushed out of each register and try to make those numbers the same.

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jimh903 t1_jeav3tg wrote

This is commonly cause by leaking vents in the attic or crawl space which can easily be repaired.

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Gov_CockPic t1_jea4k7a wrote

I'm not sure how they fix it, but the test we always used to use is if you fart in the middle of your living room, how long does it take to stop smelling of fart? If time-to-dispersion is less than 26 seconds of butt gas smell time, you've got yourself a leak.

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heliphas_the_high t1_jeatd4c wrote

You have to remember that if it's more than 26 seconds, you could be dealing with a butt leak. That test is kinda outdated because of this

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Earthguy69 t1_jebv6bk wrote

That only applies to standardized farts containing 0.56 curic per square meter of air.

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frias0 t1_jee7b23 wrote

Isn't this how it's supposed to be? I don't have super much experience, so an honest question.

In all places I've lived (in Sweden) you have incoming air from an adjustable vent above or below windows, or maybe somewhere else, like the ceiling. If you don't have a vent, then it's random cracks like OP (though never this big :p)

Then you have outgoing vents in bathrooms, toilets, and maybe kitchen.

The negative pressure keeps foul air from spreading from these rooms, and fresh air constantly being replenished.

If you don't have this negative pressure, either if it's by "self draft" , or by fans on the roof, how to you get circulation? In the extreme: how do you get fresh oxygen?

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