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Green Filter program
Less WasteEnergy SavingsLabor savings in cleaningHAI reduction
Program Outline Discussion on ASHRAE
standard 52.2. Understanding of the filter testing and MERV rating system.
Discussion of air filtration product types. Identify products that provide the greatest value for the consumer.
Discussion energy savings gained from air filtration
Air Filtration testing
ASHRAE 52.1 – 1992 (old standard)
ASHRAE 52.2 – 1999 (new standard)
Dioctylphthalate (DOP) and Poly-alpha olafins (PAO)
UL 900
ASHRAE 52.1
A design qualification test A destructive test to measure
average efficiency, pressure drop, and dust holding capacity for low and medium efficiency filters
Test aerosol is ASHRAE standard test dust:
Size classified Arizona Road Dust
Cotton linters Carbon black
Initial ResistanceRequired to move air
through a filter at a given linier flow
Written in inches water, pascals or millimeters water
Dust holding capacity Amount of dust filter holds
at end of test Written in grams
ASHRAE 52-1
Arrestance – Using ASHRAE Test Dust Percent of dust by weight that filters captures If filter holds 60 grams out of 100 fed then the
arrestance is 60%
Efficiency – Using Outdoor Air Percent of staining filter prevents Filter 90% efficient captures 90% of the staining
dust from reaching the room
(MERV) % % %
1 Aavg < 65 < 20 G1
2 Aavg > 65 < 20
3 Aavg > 70 < 20
4 Aavg > 75 < 20
5 n/a n/a E3 > 20 80 20
6 n/a n/a E3 > 35 85 20-25
7 n/a n/a E3 > 50 90 25-30
8 n/a n/a E3 > 70 92 30-35
9 n/a n/a E3 > 85 95 40-45
10 n/a E2 > 50 E3 > 85 96 50-55
11 n/a E2 > 65 E3 > 85 97 60-65
AverageDust Spot Efficiency
Note: The final MERV value is the highest MERV where the filter data meets all requirements of that MERV.
Average Eff
a t 0.4m
F5
G4
G3
G2
ASHRAE Standard 52.2-2007Composite Average Particle Size
Efficiency, % in Size Range , m
Minimum Eff
Reporting Value
ASHRAE 52.1
AverageArrestance
EN 779Efficiency
Standards Comparison
12 n/a E2 > 80 E3 > 90 98 70-75 F613 n/a E2 > 90 E3 > 90 98 80-85 F714 E1 > 75 E2 > 90 E3 > 90 99 90-95 F815 E1 > 85 E2 > 90 E3 > 90 99 95 F916 E1 > 95 E2 > 95 E3 > 95 100 99 H10
Range 1 Range 2 Range 3
0.30 - 1.0
n/a
1.0 - 3.0
n/a
3.0 - 10.0
E3 < 20
n/a n/a E3 < 20n/a n/a E3 < 20n/a n/a E3 < 20
ASHRAE 52-1 is no longer used
ASHRAE 52-2 is the new air filtration standard
Addendum B Published (Sept 2008) Non-Mandatory Appendix – Appendix
J has been added SPECIFIABLE value –
MERV-A The filter should be
tested per ASHRAE 52.2 (including Appendix J)
The resulting MERV-A must have the same (or higher) numerical value when compared to the MERV value.
Dust Holding Capacity was added Dust Weight Arrestance was added
ASHRAE 52.2
ASHRAE 52.2
ASHRAE 52.2 Standard A design qualification test
A destructive test to measure minimum efficiency (MERV)
Efficiency test aerosol is Potassium Chloride (KCl) particles, 0.1 to 10 micron
Dust loading aerosol is ASHRAE Standard Test Dust
Initial Resistance - Pressure required to move air through filter at a certain air flow written in inches water, pascals or millimeters water
Final Resistance - Pressure at which the filter would be considered fully loaded
Exhaust
Room Air
Outlet Filters
ASMENozzle Downstream Mixer
Blower Flow Control Valve
Inlet Filters
Aerosol Generator
Upstream Mixer
OPC
Device Section
Backup Filter Holder (UsedWhen Dust loading)
Test Duct Configuration
Minimum Efficiency Reporting Value: MERV 6 @500FPM
Composite Average Efficiency:
SizeRange
(microns)
Fractional Efficiency (%) @ P (“W.G.)Composite Minimums
0.285 0.320 0.464 0.643 0.822 1.000
0.3-0.4 2.7 6.7 17.2 29.4 37.1 37.9 2.70.4-0.55 7.8 15.9 27.7 43.3 53.2 54.6 7.80.55-0.7 11.2 30.2 46.0 60.7 70.5 71.6 11.20.7-1.0 17.6 42.6 59.3 73.7 81.3 81.8 17.61.0-1.3 20.4 51.6 70.3 80.8 83.7 85.2 20.41.3-1.6 23.9 58.2 76.5 84.7 86.1 87.2 23.91.6-2.2 28.3 69.9 84.1 89.1 90.2 91.0 28.32.2-3.0 36.3 83.9 91.9 94.2 94.4 93.2 36.33.0-4.0 39.4 89.4 93.7 95.8 96.4 94.9 39.44.0-5.5 42.8 90.6 95.3 96.5 97.9 95.6 42.85.5-7.0 46.5 92.3 97.1 98.0 98.4 97.9 46.57.0-10.0 50.4 94.8 97.5 98.3 100.0 99.2 50.4
Initial0.3 to 1.0 Micron
1.0 to 3.0 Micron 3.0 to 10.0
Micron
E1 = 9.8 E2 = 27.2 E3 = 44.8
TYPICAL 52.2 COMPLETE LOADING TEST DATA
ASHRAE 52.2
Minimum Efficiency Reported Value (MERV) Efficiency by particle size reported as one number – 1 to 16
52.1 Equivalent100
908070605040302010
0
0.30
0.35
0.47
0.62
0.84
1.14
1.44
1.88
2.57
3.46
4.69 6.
28.
37 10
Effic
ienc
y, %
95%
85%
65%
25%
Not to exact scale, representation only
ASHRAE 52.2 “Appendix J”
Incorporates a conditioning step using KCL. Eliminates static charges on media that typically
dissipates quickly in service. Results in a MERV-A rating
HEPA Filter Tests A non-destructive penetration test Aerosolized dioctylphthalate (DOP) - or
polyalphaolephins (PAO) Instrument measures overall intensity of light
scattered by aerosol both upstream and downstream
Polystyrene latex spheres (PSL) – fractional efficiency measured with particle counter
Cost of Energy
World events have impact on the global cost of oil
Energy cost drive economic decisions for most everyone
Life Cycle-costs Investment – capital cost of
filters, frames, installation
PCenergy – present total cost of power
PCmaintenance – present total cost of maintenance including filter replacement, etc.
PCcleaning – present cost of duct cleaning
PCdisposal – present total cost for removal and disposal of the used filters
22%
44%11%
23%
Energy Utilization in a Standard Building
CoolingVentilationLightsPlugs
Energy Savings SFC filter cost per square foot of
media is less than a MERV 13 filter. ASHRAE requires MERV 14 filters in hospitals
Labor cost slightly higher Disposal cost slightly lower Energy costs savings reduced Cleaning savings significant HAI reduction significant
15%5%2%
8%70%
Standard Building Cost Air Filtration
Filter CostLabor CostDisposal CostCleaning Cost
As a rule of thumb- “A reduction of .1” WG. saves $25-$40 per opening per year in energy.” Standard MERV 14 filters have .5 to .7 initial static pressure. Sanders Filter starts at .2.
Green Filter program
• Less Waste• Energy Savings• Labor savings
in cleaning• HAI reduction