How Air Pressure Can Screw Up Your Home: the House of Pressure
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- เผยแพร่เมื่อ 12 ก.ค. 2022
- Take a tour of the dynamics of home pressure with Jake Nuckolls at the Building Performance Center in Bellingham, WA. This training tool has made the invisible visible for thousands of home performance professionals, and we thought everybody else should get to see it in action too!
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Just learned my microwave’s range over top our stove top has been pulling air into the wall. My moisture meter is picking up water damage directly adjacent on the other side of the wall. It’s a nightmare and more people need to know how microwave exhausts can do this.
I just watched this vid again. Very thought-provoking. My wife and I have a very nice super-insulated, off-grid home with a wood cookstove. Own own woodlot means we have essentially zero heating costs. Although the home is passive solar, we depend on that stove a lot on those nippy winter days (down to minus 42C!). Well, wood burning appliances and airtight construction don't go together very well, as any depressurization results in serious (and instant) back-puffing of flue gasses into the living space. We knew this before we built, and simply crack a window every time we turn on the bath fan or central vacuum system. This year we intend to finally install a proper HRV system (yes, it should have gone in on day one) but I'd like to find a way to automate the system. In other words, I'd like the system to sense the interior air pressure and adjust the incoming air accordingly. My long-term goal is to make the house do all the thinking, because the occupants shouldn't need to always 'remember'. Great series of videos; keep up the good work!
That’s an awesome display to show the pressure issues in homes.
The amount of fun I would have with that house would be immeasurable.
Awesome demonstration
Thank you! Cheers!
GREAT video. This topic is covered by the Chimney Safety Institute of America who offers certifications for Chimney Pros and Dryer Vent Pros (like me!) and Down here in FL I think some of the issues we face primarily in the summer with a significant amount of condensation build up in people's vents and dryers even is sometimes (not always) related to this. It's something I've been trying to figure out.
So, dryers produce negative air pressure (along with the other things you mentioned). Dryers as you may know require "make up air" which come from the surrounding vicinity of the dryer. have you found where, when a dryer is NOT turned on, but an AC system is on, that it's drawing so much pressure that it draws air from the outside through the dryer exhaust into the inside of the home?
Any chance you guys know of any great articles or videos specifically on various ways/ scenarios dryers can be effected by negative / positive pressure?
This is an excellent video. Have you ever investigated how house pressure influences radon in the home ?
I love the little handheld smoker. I've googled a whole bunch of words to find one, but not luck. What's it called?
Stellar visual demonstration 😎
Thanks! Check out the Cirrus Wind Indicator.
I live in a condo and whenever I turn on the fan above the stove or in the bathroom, odours from the unit above me come through the gas fireplace (they are heavy smokers). Your video just explained this phenomenon to me and why it happens - thank you! Next step is to understand what, if anything, I can do within my unit that can prevent it from happening. Is there a way to create a continuous positive pressure inside my unit and if so - what type of equipment is required - and is that a good idea to do (e.g. to live under constant positive pressure)?
That's some very interesting information and is most useful on how the atmosphere works within the home. The smoke tool you're using is that available to purchase?
trutechtools.com/Cirrus-CWI200-Wind-Indicator
Thanks for the information! Is there an effective way to create positive pressure in a home? Looks like attic fan system is the only way that we found. Great videos. I just don't see one specific to positive pressure.
Supply-only ventilation will positively pressurize a home. Either an Aircycler controlling an outside duct into the return plenum, or a ventilating dehumidifier like Broan/Santa Fe.
A word of advice; zebras make very poor indoor pets. Keep them outside. Seriously, though, great house model and an excellent way to teach the concepts of air movement! Keep up the good work.
Thanks Paul!
What a great demo. Im alittle confused though, how did pressurizing the living room by turning on the fans coming out of the floor cause the chimney pipe to suck back into the living room. Sorry just trying to figure out what i missed. Thank you
Supplies are in the side rooms, which got their doors closed. Common HVAC layout to have a big central return in the great room.
My hot water tank was red flagged because it was backdrafting. It backdrafted when we ran the dryer or any fans in the house. I don't think this is normal. What could be the cause of this? Do I need to get an air exchanger to correct it if I can't find the cause?
Hi thanks so much for this video I have a couple of question! A little background I am trying to solve trying to increase the pressure inside when outside pressure drops since the falling barometric pressure causes chronic pain in me (looking to see if I can maintain within a range)
-I saw in your video that too high or too low of pressure wasn’t good for the house and I was wondering what those tolerances are as I mentioned I’d like to see if I can build something to decrease/dampen pain by reducing the rate of the pressure drop so maybe there are ways to increase the pressure tolerances?
-separately I’ve been looking for a building scientist who has experience working in both a house and in a greenhouse (since im working on building a blend of the two) in case you know of anyone who you could refer for a project?
Hey Mackenzie- sorry, but barometric pressure varies in PSI, which is orders of magnitude beyond the pressures we’re measuring or inducing in homes.
I would be happy to consult with you, I specialize in weird stuff:
buildingperformanceworkshop.com/video-consulting
How does the meter reading work?
The tools are great; however, most don't have access to them. Are there any virtual house tools that you are aware of to help teach and demonstrate these principles?
Not aware of them- our solution is vids like this and putting Home Diagnosis on TV.
yeah it's called high school physics
What effect does negative or positive pressure have on the body, if any? And does air pressure get affected if supply vents are closed while HVAC unit is not turned on?
What effect does negative or positive air pressure have on the body, if any? Also, can air pressure be affected if supply vents are closed while HVAC unit is not turned on?
If you get to the northeast, you shojld check out the BS group that meets in Portland. They originated the Pretty Good House standard.
Cool beans Smith
Where can you get one of those House of Pressure?
Search online, a guy named Dale Sherman used to make a pretty slick mobile one, there are others made by Anthony Cox et al.
I would love to know the correct method of positively pressurizing a house so when the neighbors are burning their lawn trimmings, i don’t get any of that smoke seeping in..
Home Pressure Effects of Unbalanced ERV, Ventilating Dehumidifier, or Supply-Only Ventilation
th-cam.com/video/7nhXP3v5Zy0/w-d-xo.html
How do you solve for the air pressure.
Only two solutions: airsealing and fans
So is there a "correct number" that a home's pressure should be most of the time? ie, obviously that number will change when people open doors, etc. Also my house gets waaaaay too much humidity in it. Someone said I might have too much negative pressure in the home; that the house is sucking in a lot of air from the outside.
Yes, that can happen- in my opinion, the ideal pressure in zero wrt outside.
@@HomePerformance What is wrt?
With respect to
I agree. If I had to err, I would err on the side of very slight pressurization, to stop appliances such as woodstoves, fireplaces (hate them!) and gas water heaters backdrafting. But in a poorly detailed home, pressurization will drive air and moisture into the envelope, causing condensation and major rot and mold issues. @@HomePerformance
So show us how to make corrections
That’s the other 600 videos on this channel my dude
@@HomePerformance 😂
@@HomePerformance legend
shoulda stayed in school, B
Can this negative pressure also cause frozen doors and locks?
Interestingly, I would actually suspect positive pressure instead. Or wind blowing on the rear face of the home.
@@HomePerformance I agree. Cold outdoor air is usually dry air, whereas indoor air is moist. A slightly pressurized house is going to move that moist air into your door locks and that moisture will condense.
What does positive pressure do?
Pushes air out
@@HomePerformance firstly thanks for responding secondly i meant what are the pros and cons for having a house with a positive pressure?
I live in a very dusty/windy area and exhaust fans are a big entry point for dusty air to get in. Also if you were to run two different sized exhaust fans (kitchen and bathroom exhaust fans)
At the same time the bigger fan would suck air through the smaller bathroom exhaust fan opening even if it’s on.
I was thinking about replacing exhaust fans with just positive pressure…any thoughts on what could go wrong? Or what precautions should one take?
Aha, that- here you go:
Supply Ventilation for Homes: Mythbusting Side Effects
th-cam.com/video/0ak32UorJEg/w-d-xo.html
@@salmanalqahtani6943 Under these dusty/windy conditions, I'd personally worry more about intake(s). Your exhaust fan will eventually push out and clear pretty much anything thrown at them.
Patreon link resulted in a 404 error for me - just a heads up!
Thanks so much- fixed now! We’d love to have you on board!
At 5:47 in the video, I'm reminded of how they drug people inside their homes through their HVAC systems in California's Central Valley
Why do my ears feel under pressure in my bedroom?
HELP! Great demo-house you built! Amazing. We have a 2 story house1940-50ish. No soffits, Brick house. 49 feet of ridge. 4 turtle vents. 2 tiny gable vents. Attic space only 36-42'' inches tall at ridge. Bat infestation. Removed all old insulation and ceiling drywall on second floor. New drywall, new insulations. Sealed every canlight and fire alarm boxes. Greatly reduced toxins in air that caused itchy throat and lungs - smells down 80%. STILL, after all this work, on certain days, (air pressure?) attic smell enters the house. Mainly the toxic smell is on second floor. Other days, can hardly notice the smell or the itchy sensation. Any advice would be appreciated. Thanks Rob
Hey Rob- in short:
The 4 P's to Solve Indoor Air Problems and Control Your HOMEChem
th-cam.com/video/Z5ycbz1Xz8U/w-d-xo.html
You can find folks to consult with if needed while I’m on hiatus at:
buildingperformanceworkshop.com
What effect does negative or positive air pressure have on the body, if any? Also, can air pressure be affected if supply vents are closed while HVAC unit is not turned on?
I think the answer to both those questions is 0, as far as the science shows today