Joseph Lstiburek, Ph.D, P.Eng, ASHRAE Fellow Building Science Adventures In Building Science www.buildingscience.com Build Tight - Ventilate Right Joseph Lstiburek 2 Lstiburek buildingscience.com 1 of 45
Build Tight - Ventilate Right How Tight? What s Right? Joseph Lstiburek 3 Air Barrier Metrics Material 0.02 l/(s-m2) @ 75 Pa Assembly 0.20 l/(s-m2) @ 75 Pa Enclosure 2.00 l/(s-m2) @ 75 Pa 0.35 cfm/ft2 @ 50 Pa 0.25 cfm/ft2 @ 50 Pa 0.15 cfm/ft2 @ 50 Pa Joseph Lstiburek 4 Lstiburek buildingscience.com 2 of 45
Getting rid of big holes 3 ach@50 Getting rid of smaller holes 1.5 ach@50 Getting German 0.6 ach@50 Joseph Lstiburek 5 Best As Tight as Possible - with - Balanced Ventilation Energy Recovery Distribution and Mixing Source Control - Spot exhaust ventilation Filtration Material selection Joseph Lstiburek 6 Lstiburek buildingscience.com 3 of 45
Worst Leaky - with Nothing Spot Ventilation in Bathroom/Kitchen Exhaust Ventilation with No Distribution and No Mixing Joseph Lstiburek 7 Three Types of Controlled Ventilation Systems Exhaust Ventilation Supply Ventilation Balanced Ventilation Joseph Lstiburek 8 Lstiburek buildingscience.com 4 of 45
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Joseph Lstiburek 17 Ventilation Rates Are Based on Odor Control Joseph Lstiburek 18 Lstiburek buildingscience.com 9 of 45
Ventilation Rates Are Based on Odor Control Health Science Basis for Ventilation Rates is Extremely Limited Joseph Lstiburek 19 Ventilation Rates Are Based on Odor Control Health Science Basis for Ventilation Rates is Extremely Limited Almost Nothing Cited Applies to Housing Joseph Lstiburek 20 Lstiburek buildingscience.com 10 of 45
Ventilation Rates Are Based on Odor Control Health Science Basis for Ventilation Rates is Extremely Limited Almost Nothing Cited Applies to Housing The Applicable Studies Focus on Dampness Joseph Lstiburek 21 Aubin, D., Won, D.Y., Schleibinger, H., 2010 Joseph Lstiburek 22 Lstiburek buildingscience.com 11 of 45
Joseph Lstiburek 23 Dilution Is Not The Solution To Indoor Pollution Source Control Joseph Lstiburek 24 Lstiburek buildingscience.com 12 of 45
Dilution For People Source Control For The Building Joseph Lstiburek 25 Joseph Lstiburek 26 Lstiburek buildingscience.com 13 of 45
Recommended Range of Relative Humidity Above 25 percent during winter Below 70 percent during summer Joseph Lstiburek HVAC 28 Lstiburek buildingscience.com 14 of 45
Joseph Lstiburek HVAC 29 Kitchen Exhaust Hoods Joseph Lstiburek 30 Lstiburek buildingscience.com 15 of 45
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Joseph Lstiburek 39 Clothes Dryers Joseph Lstiburek 40 Lstiburek buildingscience.com 20 of 45
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Fireplaces Joseph Lstiburek 43 Joseph Lstiburek 44 Lstiburek buildingscience.com 22 of 45
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Approaches Joseph Lstiburek 47 Joseph Lstiburek 48 Lstiburek buildingscience.com 24 of 45
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Duct Leakage Should Be Less Than 5% of Rated Flow As Tested by Pressurization To 25 Pascals Joseph Lstiburek 61 Joseph Lstiburek 62 Lstiburek buildingscience.com 31 of 45
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