ASHRAE 62.2 Home Ventilation Standard Explained: Guided Tour of Building Science Gems Hiding Inside

Here's my treasure-hunting tour through the document finding a lot of very interesting, sometimes surprising, nuggets of knowledge. Enjoy, fellow building nerds.

[jeremyj.]

This video hit at exactly the right time. I’ve been sniffing around my house, now that it’s getting cold on the west coast of BC, any air sealing gaps or mold growing around windows, etc. I’ve been thinking about spray foaming the attic and pulling the bathroom exhaust fans back into the return air. Plus adding 5” returns to each room on the top floor. This sort of ventilation guidelines are EXACTLY what I need to hear to make better decisions when the time comes. Thank you so much for doing these kinds of videos!

[joegriffin]

Thanks for read through. Building my first high performance home. I still had questions about exhaust hoods. This was helpful. Love the nerdy deep dives.

[virgil]

This is some awesome info. Been down the energy efficiency the last 6 years since we moved to a new house. But have always been doing this all my years of home ownership with the knowledge I had. Now, Im done and is it perfect?. Who knows, its as good as its going to get with a new HRV. I think this chasing the perfect ventilation is a pipe dream and can never be achieved. Can it be close, sure. But I think most home owners get to a point and do what they can, and just say "good enough" That's where I am. Maybe because I'm Gen X, or maybe because I was raised on a farm raised on wood heat. My downdraft stove vent has no make up air, so I get negative pressure on high because I dont have any makeup air linked to it. Oh no, been like that for 6 years now, life moves on. The chase of perfection can drive you to madness, since each day can be different.

[Werdna]

I like the updated diagram you have for the hvac expert list page!

[cujo]

So new houses on my area are required to get a blower door rating of 3 or better to pass local code. The builders I'm talking to say they don't pit in ERV's of HRV's in their builds. They say use traditional bath fans and range hoods for ventilation and only a barometric air intake on a furnace intake.
Is this acceptable with a house with blower door value of 3? If so, how much tighter would you have to be to start requiring an ERV or HRV to be installed?

[MrNiceGuyMEGA]

I think multiple viewers appreciate the "nerdy" videos.
I have generally been a fan of affordable starter homes, but when you were talking about the standards and how the percentage of leakage is greatly impacted by the square footage of the house, It seems that by having better standards for air quality, insulation, and air sealing, that the cost per square foot would actually be higher for so-called tiny houses than it would be for something ever so slightly larger. (Just a random thought if you can understand what I'm trying to get at.)
Thanks for the video!

[jeremyjedynak]

Some confusion at the beginning of the video regarding minimum MERV ratings. The segment starts by saying 13 is the minimum but then ends sounding like 11 is the minimum.

[ServioUribe]

This was really illuminating. What video should I watch about HVAC and ERV relationship in the sense of conditioned air and how it’s affected by an ERV.

Also, things like if I have an ERV exhaust vent in my kitchen how far should it be from my Kitchen exhaust for core clog up reduction or avoidance?

Maybe a good q&a of details like that would be good.

Anyways, thank you!

[Jimhavasu]

Corbett thanks for the great information, but don’t forget that any bedroom that doesn’t have a door to the outside will need an operable window no matter what. It’s called egress

[DeadStump]

What are your thoughts on building your own ducts out of rigid foam board? duct metal has gotten crazy expensive over the past few years, in my area at least.

[manleynelson]

Is anyone else experiencing a blurry video. I've tried to adjust it

[av]

Man some of this stuff goes against conventional wisdom. I purposely used non operable windows everywhere they werent required.

[bibbidi_bobbidi_bacons]

The government energy efficiency standards are trying to kill us - they leave this incredibly vital information out of it