ASHRAE 62.2 for Retrofits Ventilation for the 21 st Century
Build it Tight, Ventilate it Right
ASHRAE 62.2 For Retrofits “The standard • defines…………..”
ASHRAE 62.2 For Retrofits Applies to…
ASHRAE 62.2 For Retrofits IAQ is the goal– however…..
ASHRAE 62.2 For Retrofits Advantages to adopting 62.2:
ASHRAE 62.2 For Retrofits Disadvantages to adopting 62.2:
ASHRAE 62.2 For Retrofits • ASHRAE requires two types of ventilation
ASHRAE 62.2 For Retrofits • Whole House Ventilation requirements
62.2 Standard Overview • Install Whole House Ventilation System • Run the WHV System continuously • Install Local Exhaust • Make Up Air directly from outside • Clothes Dryers vented to outside • House to garage sealed including ducts • Account for the interactions of ventilation systems and atmospherically vented combustion
Terminology • Ventilation • Whole House Ventilation • Local Ventilation • CFM • ACH • Deficits • Credits
ASHRAE 62.2 For Retrofits Calculating The Whole-House Ventilation Requirement
PEMDAS • Parentheses • Exponents • Multiplication • Division • Addition • Subtraction
ASHRAE 62.2 For Retrofits • Option One Use this Formula CFM = Floor area x .01 + (# of bedrooms +1) x 7.5
Option Two use the table…. Number of bedrooms 0-1 2-3 4-5 6-7 >7 Floor Area <1500 30 45 60 75 90 1501-3000 45 60 75 90 105 3001-4500 120 60 75 90 105 4501-6000 105 75 90 120 135 6001-7500 90 105 120 135 150 >7500 105 120 135 150 165
ASHRAE 62.2 For Retrofits The Local (Spot) Ventilation Requirement
ASHRAE 62.2 requires local spot ventilation
ASHRAE 62.2 For Retrofits Fan Deficit Rule
ASHRAE 62.2 For Retrofits Fan Deficit Rule Deficit may not be below zero for any bathroom or kitchen
Fan Deficit Rule Example # 1: 3 BR, 1500 sqft Kitchen Bath Bedroom Bedroom -50 cfm -100 cfm Master bath Master Bedroom -50 cfm
Fan Deficit Rule Example # 1: 3 BR, 1500 sqft Kitchen Bath Bedroom Bedroom -50 cfm -100 cfm Deficit= 100 + 50 + 50 = 200 cfm 200 / 4 = 50 cfm Master bath Master Bedroom -50 cfm
Fan Deficit Rule Example # 1: 3 BR, 1500 sqft Kitchen Bath Bedroom Bedroom -50 cfm -100 cfm Deficit= 100 + 50 + 50 = 200 cfm 200 / 4 = 50 cfm Master bath Master Bedroom -50 cfm Whole house ventilation requirement = 45 ( from table 4.1a) With fan deficit = 45 + 50 = 95 cfm continuous.
Fan Deficit Rule Example # 1: 3 BR, 1500 sqft With window credit Kitchen Bath Bedroom Bedroom -50 cfm -100 cfm Deficit= 100 + 50 + 50 = 200 cfm 3 operable windows x 20 cfm = 60 cfm 200 cfm – 60 cfm = 140cfm Master bath Master 140 / 4 = 35 cfm Bedroom -50 cfm Whole house requirement = 45 + 35 = 80 cfm continuous.
Fan Deficit Rule Example # 2: 3 BR, 1500 sqft Kitchen Bath Bedroom Bedroom -50 cfm -50 cfm Master bath Master Bedroom -20 cfm
Fan Deficit Rule Example # 2: 3 BR, 1500 sqft Kitchen Bath Bedroom Bedroom -50 cfm -50 cfm 50 + 50 + 20 = 120 cfm Master bath Master Bedroom -20 cfm
Fan Deficit Rule Example # 2: 3 BR, 1500 sqft Kitchen Bath Bedroom Bedroom -50 cfm -50 cfm 50 + 50 + 20 = 120 cfm 120 / 4 = 30 cfm Master bath Master Bedroom -20 cfm Whole house requirement: 45 cfm + 30 cfm = 75 cfm continuous
Fan Deficit Rule Example # 2: 3 BR, 1500 sqft With window credit Kitchen Bath Bedroom Bedroom -50 cfm -50 cfm 50 + 50 + 20 = 120 cfm 3 operable windows x 20 cfm = 60 cfm 120 – 60 = 60 cfm Master bath Master 60 / 4 = 15 cfm Bedroom -20 cfm Whole house requirement: 45 cfm + 15 cfm = 60 cfm continuous
ASHRAE 62.2 For Retrofits Calculating The Infiltration Credit
ASHRAE 62.2 For Retrofits Calculating The Infiltration Credit
ASHRAE 62.2 For Retrofits Calculating The Infiltration Credit • Measured Infiltration • Assumed infiltration • Infiltration Credit
ASHRAE 62.2 For Retrofits Calculating The Infiltration Credit • Measured Infiltration Measured Infiltration = CFM 50 / N
ASHRAE 62.2 For Retrofits Calculating The Infiltration Credit • Assumed infiltration Assumed Infiltration = Floor area x 0.02
ASHRAE 62.2 For Retrofits Calculating The Infiltration Credit • Infiltration Credit Infiltration Credit = ½ (Measured – Assumed)
ASHRAE 62.2 For Retrofits Calculating The Infiltration Credit Example: 1000 sq ft home located in Olympia, WA Blower door 1600 cfm @ 50 pa 1000 sq ft x .02 = 20 cfm 1600 cfm ÷ 25.6 = 62.5 cfm natural 62.5 cfm – 20 cfm = 42.5 cfm 42.5 cfm ÷ 2 = 21.25 cfm You can reduce your whole house continuous ventilation rate by 21.25 cfm
Infiltration Credit Example # 1: 3BR, 1500 Sqft Located in Olympia, WA Existing Kitchen & Bath fans installed Kitchen Bath Bedroom Bedroom 1500 x .02 = 30 cfm Master bath Master Bedroom
Infiltration Credit Example # 1: 3BR, 1500 Sqft Located in Olympia, WA Existing Kitchen & Bath fans installed Kitchen Bath Bedroom Bedroom 1500 x .02 = 30 cfm Master bath Master Bedroom 1200 CFM @ 50
Infiltration Credit Example # 1: 3BR, 1500 Sqft Located in Olympia, WA Existing Kitchen & Bath fans installed Kitchen Bath Bedroom Bedroom 1500 x .02 = 30 cfm 1200 cfm ÷ 25.6 = 47 cfm Master bath Master Bedroom 1200 CFM @ 50
Infiltration Credit Example # 1: 3BR, 1500 Sqft Located in Olympia, WA Existing Kitchen & Bath fans installed Kitchen Bath Bedroom Bedroom 1500 x .02 = 30 cfm 1200 cfm ÷ 25.6 = 47 cfm 47 cfm – 30 cfm = 17 cfm Master bath Master Bedroom 1200 CFM @ 50
Infiltration Credit Example # 1: 3BR, 1500 Sqft Located in Olympia, WA Existing Kitchen & Bath fans installed Kitchen Bath Bedroom Bedroom 1500 x .02 = 30 cfm 1200 cfm ÷ 23 = 52 cfm 47 cfm – 30 cfm = 17 cfm Master bath Master 17 ÷ 2 = 8.5 cfm Bedroom 1200 CFM @ 50
Infiltration Credit Example # 1: 3BR, 1500 Sqft Located in Olympia, WA Existing Kitchen & Bath fans installed Kitchen Bath Bedroom Bedroom 1500 x .02 = 30 cfm 1200 cfm ÷ 25.6 = 47 cfm 47 cfm – 30 cfm = 17 cfm Master bath Master 17 ÷ 2 = 8.5 cfm Bedroom 1200 CFM @ 50 Required whole house ventilation rate: 45 cfm With ventilation credit: 45 – 8.5 = 36.5 Continuous whole house ventilation rate is 36.5 cfm
Infiltration Credit Example # 2: 3BR, 1500 Sqft Located in Olympia, WA Existing Kitchen & Bath fans installed Kitchen Bath Bedroom Bedroom 1500 x .02 = 30 cfm Master bath Master Bedroom 3500 cfm @ 50
Infiltration Credit Example # 2: 3BR, 1500 Sqft Located in Olympia, Wa Existing Kitchen & Bath fans installed Kitchen Bath Bedroom Bedroom 1500 x .02 = 30 cfm 3500 cfm ÷ 25.6 = 137 cfm Master bath Master Bedroom 3500 cfm @ 50
Infiltration Credit Example # 2: 3BR, 1500 Sqft Located in Olympia, WA Existing Kitchen & Bath fans installed Kitchen Bath Bedroom Bedroom 1500 x .02 = 30 cfm 3500 cfm ÷ 25.6 = 137 cfm 137 cfm – 30 cfm = 107 cfm Master bath Master Bedroom 3500 cfm @ 50
Infiltration Credit Example # 2: 3BR, 1500 Sqft Located in Olympia, WA Existing Kitchen & Bath fans installed Kitchen Bath Bedroom Bedroom 1500 x .02 = 30 cfm 3500 cfm ÷ 25.6 = 137 cfm 137 cfm – 30 cfm = 107 cfm Master bath 107 ÷ 2 = 53.5 cfm Master Bedroom 3500 cfm @ 50 Required whole house ventilation rate: 45 cfm With ventilation credit: 45 cfm – 53.5 cfm = -8.5 cfm Continuous whole house ventilation rate is 0.
ASHRAE 62.2 for Retrofits Alternative Compliance Supplement for Existing Dwellings Appendix A of 62.2-2010
ASHRAE 62.2 For Retrofits Alternative Compliance Path • For existing dwellings only.
ASHRAE 62.2 For Retrofits Alternative Compliance Path • For existing dwellings only. • Provides an alternative method of meeting Local exhaust requirements in kitchens and bathrooms that do not have existing ventilation as required by ASHRAE 62.2-2010.
ASHRAE 62.2 For Retrofits Alternative Compliance Path • For existing fans being used, 62.2 sound and ducting requirements are not applicable. • You must measure flow if ratings don’t exist and duct sizing cannot be verified. – If you only have a rating at .10 IWC, not .25 IWC, you can reduce the rating at .10 IWC by 25%
ASHRAE 62.2 For Retrofits Alternative Compliance Path If you cannot measure flow or determine ratings, you must assume a zero flow for the fan.
How do we solve this? What do we install? Where do we install it?
Fan Deficit Rule Example # 1: 3 BR, 1500 sqft Kitchen Bath Bedroom Bedroom -50 cfm -100 cfm Deficit= 100 + 50 + 50 = 200 cfm 200 / 4 = 50 cfm Master bath Master Bedroom -50 cfm Whole house requirement 45 cfm + 50 = 95 cfm
Fan Deficit Rule Example # 1: 3 BR, 1500 sqft Option #1 Add 110 cfm fan Kitchen Bath Bedroom Bedroom 110 cfm -100 cfm fan Deficit= 100 + 50 = 150 cfm 150 / 4 = 37.5 cfm Master bath Master Bedroom -50 cfm Whole house ventilation requirement = 45 ( from table 4.1a) With fan deficit = 45 + 37.5 = 82.5 cfm continuous. The fan installed must meet 82.5 cfm continuous requirement
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