1. ASHRAE’s 62.2 Residential Ventilation Standard Proposed Changes
Mike Moore, P.E.
Newport Ventures

2. What We’ll Cover What is ASHRAE 62.2?
How does 62.2 currently address filtration?
Recent IAQ research and filtration implications
ASHRAE 62.2 proposed changes related to filtration

3. ~300-400k dwelling units annually
ASHRAE 62.2
Charge: ventilation and acceptable IAQ
Scope: non-transient dwelling units
Adoption
State or Program
Required?
Annual Dwelling Units
California
Yes
50-80k
Georgia
Optional
30-50k
Maine
3-5k
Massachusetts
7-10k
Oregon
10-15k
Vermont
~1k
ENERGY STAR
80-100k
DOE Weatherization k
~ k dwelling units annually
Total: ~ k dwelling units per year

4. ASHRAE 62.2: Current Requirements Clean Filter Pressure Drop
Objective: Ensure that ducted system airflow is not inhibited
System sizing: Ducted space conditioning systems sized to accommodate AHRI 680’s rated clean filter pressure drop
Label filter locations with:
Design airflow
Max pressure drop

5. ASHRAE 62.2: Current Requirements Filtration
Objective: Avoid fouling of heat exchanger and potential biological growth
Minimum filtration:
ASHRAE 52.2: MERV 6, or
AHRI 680: Particle Size Efficiency of 50% in the 3-10 μm range
Trigger conditions:
Supply ducts > 10 ft,
Air passes “through a thermal conditioning component”

6. Residential IAQ Research
PM2.5 = most significant indoor air pollutant, up to 10x the negative health impacts of the 2nd and 3rd most significant indoor air pollutants
Indoor PM2.5 accounts for ~0.01 disability adjusted life years (“DALYs”) per person
Value of a DALY: $50k-$200k
Annual monetization of negative health effects of PM2.5 in U.S. residences: $500 - $2000/person
Sources:
Logue JM, Price PN, Sherman MH, & Singer BC A Method to Estimate the Chronic Health Impact of Air Pollutants in U.S. Residences. Environmental Health Perspectives 120(2):
Turner WJN, Logue JM, and Wray CP Commissioning Residential Ventilation Systems: A Combined Assessment of Energy and Air Quality Potential Values. LBNL-5969E.
Brown DW Economic value of disability-adjusted life years lost to violence: estimates for WHO Member States. Rev. Panam Salud Publica, 24,
Lvovsky K, Huges G, Maddison D, Ostro B, and Pearce D Environmental costs of fossil fuels: a rapid assessment method with application to six cities. Washington, D.C.: The World Bank Environment Department.
Highfill T and Bernstein E Using Disability Adjusted Life Years to Value the Treatment of Thirty Chronic Conditions in the U.S. from U.S. Department of Commerce Bureau of Economic Analysis WP

7. ASHRAE 62.2-2016 Addendum K: Filtration for PM2.5 Mitigation
Concept: Improve IAQ by encouraging reduction of indoor PM2.5 concentration using better filtration
Objective: Achieve a time-averaged, recirculated “clean air delivery rate” of 1.5 times the ventilation rate
Incentive: receive a 20% credit off the ventilation rate
Status: Second public review completed.

8. Q: What Volume of Clean Air is Needed?K
A: It depends on the filter and the 62.2 design outdoor air flow rate
Qfr = time-averaged flow rate of filtered, recirculated air
ffr = “filtration factor”; determined by AHRI 680 or ASHRAE 52.2, or other approved method
Qtot = total combined infiltration/ventilation outdoor air flow rate required by 62.2
Qfr: period is not to exceed 1 day; if period exceeds 12 hours, at least 10% of Qfr must be provided in each 12 hour period (Section )

9. K What’s a Filter Worth? ffr = “filtration factor”
ASHRAE 52.2
ffr = “filtration factor”
Higher PM2.5 filtering capacity = lower filtration factor
AHRI 680
PM2.5 “efficiency designation”

10. Additional RequirementsK
Distribution of filtered air: supplied to or returned from every room in the habitable space
Max time-averaged period is one day
Minimum run time every 12 hours
Readily accessible filters
Label on filter housing access door: filter designation required to achieve credit
Minimum filter efficiency: MERV 11, Particle Size Efficiency of 65% from 1.0 to 3 μm, or PM2.5 efficiency of 35%

11. K Example 2500 ft2 dwelling unit, 3 bedrooms: = 105 cfm
Specify a MERV 13 filter:
ffr = 2.1
= 105 cfm
Time-averaged flow rate of filtered, recirculated air required:
= 2.1*105 = 221 cfm

12. K Example, continued Credit against outdoor air rate:
= 0.2*105 = 21 cfm

13. = ? So What? Establishes a new precedent in 62.2 Primacy of pollutants
Trading off ventilation and filtration = ?
Houses are being built increasingly tighter to save energy. How do we maintain or improve IAQ while minimizing energy use?
(especially attractive in hot-humid climates)

14. So What? Emphasizes a filter’s PM2.5 efficiency
Requires designation transparency
MERV, AHRI 680 particle size efficiency, or approved alternative PM2.5 particle size efficiency
Aligns with CEC’s proposed filter labeling requirement

15. So What?
Labels help “lock-in” future sales
autoevolution.com

16. Next Steps 62.2 Committee: resolve public comments
Filter manufacturers
Test and provide product performance data (MERV or particle size efficiency)
Label filters
Support labeling of HVAC equipment for filters
Educate stakeholders: how improved filters can help reduce the 62.2-required ventilation rate
Develop on-line tools to calculate rates (Qtot; Qfr; Qfiltration,credit; Qfan; etc.)

17. Mike Moore 303.408.7015 mmoore@newportventures.net
Thank You
Mike Moore