What Has the New MERV Table Done
to My Products?
Michael Corbat, CAFS
Engineering Manager
Custom Filter LLC
Custom Filter LLC
What Has the New MERV
Table Done to My Products?!
Michael Corbat
April 7, 2016
Bio
 Engineering Manager at Custom Filter LLC
 15 Years Experience in Filtration Development
 Bachelor of Science Engineering Management – Western Michigan
University
 MBA from Northern Illinois University
 Chair of ASHRAE Standard 52.2
 Secretary of ASHRAE Technical Committee 2.4
 Voting Member of ASHRAE Guideline Committee 35
 US Expert to ISO TC 142/Working Group 9 - Particulate air filter intake
systems for rotary machinery and stationary internal combustion
engines
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Agenda
1. 52.2
1.
2.
MERV Table Changes
Other Changes
2. ISO 16890 Update
3. Energy Usage Guidelines
4
2015 Supplement
MERV Table Changes
MERV
E1
E2
E3
8
9
10
11
12
13
14
15
16
n/a
n/a
n/a
n/a
n/a
50 ≤ E1< 75
75 ≤ E1 < 85
85 ≤ E1 < 95
95 ≤ E1
n/a
E2 < 50
50 ≤ E2 < 65
65 ≤ E2 <80
80 ≤ E2
90 ≤ E2
90 ≤ E2
90 ≤ E2
95 ≤ E2
70 ≤ E3
85 ≤ E3
85 ≤ E3
85 ≤ E3
90 ≤ E3
90 ≤ E3
90 ≤ E3
90 ≤ E3
95 ≤ E3
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2015 Supplement
MERV Table Changes
MERV
E1
E2
E3
8
9
10
11
12
13
14
15
16
n/a
n/a
n/a
20 ≤ E2
35 ≤ E2
70 ≤ E3
50 ≤ E2
65 ≤ E2
80 ≤ E2
20 ≤ E1
35 ≤ E1
50 ≤ E1
85 ≤ E2
75 ≤ E1
85 ≤ E1
95 ≤ E1
90 ≤ E2
90 ≤ E2
95 ≤ E2
75 ≤ E3
80 ≤ E3
85 ≤ E3
90 ≤ E3
90 ≤ E3
95 ≤ E3
95 ≤ E3
95 ≤ E3
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PLEATS - MERV Before
MERV 8
MERV 8
MERV 8
 E1 = 5
 E2 = 35
 E3 = 70
 E1 = 5
 E2 = 50
 E3 = 75
 E1 = 5
 E2 = 65
 E3 = 80
PLEATS - MERV After
MERV 8
MERV 9
MERV 10
 E1 = 5
 E2 = 35
 E3 = 70
 E1 = 5
 E2 = 50
 E3 = 75
 E1 = 5
 E2 = 65
 E3 = 80
MERV 13 is Easier
 MERV 12
– E1 = 50
– E2 = 85
– E3 = 90
NOW IS A MERV 13!!
What to Look For
 Old Reports are allowed to be recalculated
– Must be 2012 or newer
– Must meet all requirements of 2015 supplement
(Shedding and Humidity)
– Must have “Recalculated” and reprint date on report
– Must still contain original test information including date
 All new reports must contain language
“52.2-2012 with 2015 Supplement”
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Approved Addendum
 Addendum C – Must use optical particle counters
 Addendum E – Full test must be performed to use
MERV
 Addendum F – All efficiency data sets must be
published (12 channels at 6 efficiency tests)
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52.2 Proposed Items
 Optional Appendix for multi-stage filter
testing
 E values included in reporting value
 MERV 14 (E1>=75%, E2>=90%, E3>=95%) @ 1970
CFM
 52.3?
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52.2 Research
 Primary Project
–
–
–
–
Independent Round Robin
Repeat of ASHRAE RP-1088
Will follow inclusion of all changes
Goal to determine ruggedness of test method
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ISO 16890
 Four Parts
– Part 1
 Classification System
 Voted to Final Draft International Standard (FDIS) in March
– Part 2
 Efficiency Testing
 Voted to FDIS in February
– Part 3
 Dust Loading
 Voted to DIS in January
– Part 4
 Discharge Method
 Voted to DIS in January
 Likely fully published by end of 2015 or early
2016
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ISO 16890 Data
Calculation
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ISO 16890
Group
Name
Requirement
Emin(PM1)
E(PM1)
Emin(PM2.5)
E(PM2.5)
E(PM10)
Class
Reporting
Value
ISO
Coarse
----
----
----
----
< 50%
Arrestance
ISO PM10
----
----
----
----
≥ 50%
E(PM10)
ISO PM2.5
----
----
≥ 40%
≥ 50%
----
E(PM2.5)
≥ 40%
≥ 50%
----
----
----
E(PM2.5)
ISO PM1
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ISO 16890 Outputs
 Filter Rating Read ISO__%ePM__
– PM value rounded down to closest 5%




Initial Pressure Drop
ePM1, ePM2.5, ePM10 (Average)
ePM1 (min), ePM2.5 (min)
Initial Arrestance
– First 30g or 0.6”WC
 Average Arrestance
 DHC
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16890 Sample Data
 Initial DP = 0.35” WC
 Filter Rating ISO 70% ePM1
– ePM1 = 56%
– ePM2.5 = 70%
– ePM10 = 83%
– ePM1(min) = 41%
– ePM2.5(min) = 53%
 Initial Arrestance = 95%
 Average Arrestance = 99%
 DHC = 300g
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Sustainability
 Both ISO and ASHRAE are handling
– ASHRAE GPC 35
– ISO WG12
 Both are in very early stages of work
 GPC 35 is requesting a research project for new loading
dust
 Calculation portion is being worked on simultaneously
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