Portable High Efficiency Air Filtration (PHEAF) Device Field Testing and Validation Standard. ANSI/IESO Standard 4310-2009. WHERE ARE HEPA FILTERS USED?. Whenever we need to move contaminated air - without the contamination coming along for the ride.
Portable High Efficiency Air Filtration (PHEAF) DeviceField Testing and Validation Standard
ANSI/IESO Standard 4310-2009
Whenever we need to move contaminated air - without the contamination coming along for the ride
AFDs & HEPA Vacuums
AFDs & HEPA Vacuums
HEPA filters are designed to be 99.97 efficient
at 0.3 micron size particles
But what happens to that efficiency when you
place that filter into a portable filtration device?
They are no longer HEPA efficient !1. They leak at the edges2. They leak at the seals 3. They loose their seal during movement4. They get micro holes5. They grow stuff
The first call for a “in field” testing and
certification standard for portable HEPA filtered devices appeared in an article in Outlook magazine in 1990.
That was almost 20 years ago.
Since 1990, the cost and portability of the
particle counting equipment required for “in field” testing and certification has significantly decreased.
This equipment is now within the price range for
large contractors or for consultants to test equipment as part of their oversight of an abatement
or remediation project.
HAND-HELD PARTICLE COUNTERS
• Only the HEPA filters are “certified”
•Testing is done by a 3rd party
• PHEAF device manufacturers do not test or certify the complete device
• There is no standard that requires testing or certification of the complete device
WHY SHOULD WE TEST THEM ?
Replacement HEPA filter testing
prior to installation into the HEPA device
by the Dept. of Energy showed a
20% failure rate of the filters alone
1 IN 5 NEW FILTERS
WAS NOT HEPA EFFICIENT !
HEPA filtered equipment contamination
of a mold remediation
2. HEPA filtered equipment leaked on an
3. Testing of numerous pieces of
contractor equipment showed significant
leakage (shown in std. appendix)
Inability to adequately clean a
PHEAF device when installing
a new HEPA filter
(The Kick Test)
DOE performs in field certification ofall HEPA filtered devicesbecause of their experience of significant failure rates and leakage problemsevery time the equipment is moved(USING AEROSOL GENERATION)
ANSI/IESO Standard 4310-2009
This standard applies to Portable High Efficiency Air Filtration Devices. (PHEAF Devices)This would include vertical and horizontal portable air filter devices, movable vacuums, hand held vacuums, and other filtered suction devices used for cleaning surfaces for the purposes of removing dust, dirt, mold, asbestos, lead and other undesired particulate environmental contaminants.
1. ASTM F1471 - 09 Standard Test Method for Air Cleaning Performance of a High-Efficiency Particulate Air- Filter System.2. ASHRAE Standard 52.2-2007 : Method of Testing General Ventilation Air-Cleaning Devices for Removal Efficiency by Particle Size3. DOE-STD-3020-97 : Dept. of Energy, Specification for HEPA filters used by DOE Contractors4. EN 1822-1:1998 : High efficiency air filters (HEPA and ULPA). Classification, performance testing, marking.5. JIS Z 8909-1 Test method of filter media for dust collection.
3. Filter Testing and Certification Standards
ASHRAE 52.2 - Method of Testing General Ventilation Air-Cleaning Devices for Removal Efficiency by Particle SizeTHIS IS THE STANDARD THATESTABLISHES MERV RATINGS FOR AIR FILTERS
Class 5 device - A portable high efficiency air filtration device that operates as a fully effective and functional air filter, meeting all the filter efficiency requirements of a HEPA filter. (MERV 17)This class of PHEAF device shall be required for all work in hospitals, in other environments where the PHEAF device discharges into the general air space of the building (and for vacuums used outside containment for contaminants such as mercury?)
Class 4 device - A portable high efficiency air filtration device that operates at a level equivalent to a 99% efficient filter. This class of PHEAF device shall be required for all work in commercial buildings or in other environments where the unit discharges into the air space of the building (and for vacuums used outside containment for contaminants such as mold and asbestos?)
Class 3 device - A portable high efficiency air filtration device that operates at a level equivalent to a MERV 16 filter. (Approx 95% efficient)This class of PHEAF device can be used for environmental contaminant filtering and/or air scrubbing within a containment, provided the containment is under negative pressure and discharges to the outside air.
Class 2 device - A portable high efficiency air filtration device that operates at a level equivalent to a MERV 15 filter. (Approx 90% efficient)This class of PHEAF device shall be the minimum class that is required for portable vacuums that can be used to clean up small, uncontained mold or asbestos releases.
Class 1 device - A portable high efficiency air filtration device that operates at a level equivalent to a MERV 14 filter. This class of PHEAF device can be used for environmental filtering / air scrubbing, within a containment, provided the containment is under negative pressure and discharges to the outside air.
Class 0 device - A portable high efficiency air filtration device that operates at a level equivalent to a MERV 13 filter. This class of PHEAF device can be used to provide general exhaust or negative pressure within a contained area when it discharges to the outside air. This class of portable hand vacuums can discharge into a contained area that is under negative pressure and from which the air is exhausted to outside of the building.
Classification Class 5 Class 4 Class 3 Class 2 Class 1 Class 0MERV * 17 NA 161514 13Particle sizeMINIMUM MEASURED PERCENT FILTER EFFICIENCY (in microns) 0.399.979995857575 0.5 99.97 9995908075 0.7 99.979995908575 1.0 99.979995909080 2.0 99.979995909085 3.0 99.979995909090 5.0 99.979999909090 10.0 99.979999909090
Table # 1 : Device Classification by Percent Reduction ofIncoming versus Discharge Particle Counts by Particle Size
*This table is based on ratings interpolated from ASHRAE 52.2 -2007 MERV for air filters.
The percent efficiency for each particle size range for the unit shall be compared to the percent removal efficiencies in Table 1 or Graph 1 and recorded on the form in Appendix A. A data point that falls between two classes should be rounded down to the lower class. The lowest class recorded for all the size ranges measured will be the designated efficiency class for the unit.
I. Reporting and Determining Efficiency Class
Test measurement data shall be recorded on the form in Appendix A. The percent particle count reduction (percent efficiency) for each particle size range shall be calculated using the equation below and also recorded on this form. Discharge particle concentration1 - __________________________ x 100 = % reduction in particle Incoming particle concentration size concentration
H. Calculation and Interpreting of Results
APPENDIX APHEAF Device Testing Data Collection FormDevice DataDevice Description ___________________________ Mfgr _____________________Unit ID # __________________ Owner ____________________________________Other Info _____________________________________________________________Test Event DataDate _____________________ Test Administrator ___________________________Location of Test ________________________ Temperature _______ RH _______Particle Counter Model # ___________ Particle Counter Mfgr. __________________Date of Calibration ____________________ Method __________________________Background Airborne Particle DataSize range Test 1Test 2Test 3Average (Bave)(in microns) (B1)(B2)(B3)(B1 + B2 + B3 / 3)0.3____________________________________________0.5____________________________________________1.0____________________________________________2.0____________________________________________5.0____________________________________________ 10.0____________________________________________
Test Results at Exhaust of UnitSize range Test 1Test 2Test 3Average (Tave)(in microns) (T1)(T2)(T3)(T1 + T2 + T3 / 3)0.3____________________________________________0.5____________________________________________1.0____________________________________________2.0____________________________________________5.0____________________________________________10.0____________________________________________Unit EvaluationSize range BackgroundUnit TestEfficiencyMaximum (in microns)Ave. (Bave) Ave. (Tave)1-(Tave/Bavex100) Class Rating*0.3____________________________________________0.5____________________________________________1.0____________________________________________2.0____________________________________________5.0____________________________________________10.0____________________________________________* See Table 1 or Graph 1 for Minimum Particle Efficiencies for Different Classes of Portable High Efficiency Air Filtration Devices (Round down to lower class when data is between two classes)Overall Classification of Device (minimum rating above) __________________Comments ______________________________________________________
Standard Challenge ConcentrationAerosol Equip. 100 µg/l 100 mg/m3ASHRAE 52.2 16.3 x 109 p/ft370 mg/m3ASTM F1471 7.0 x 109 p/ft3 30 mg/m3EU 1822 3.52 x 107 p/ft3 0.15 mg/m3
STANDARDS FOR TESTING HEPA FILTERS
STANDARDS FOR TESTING HEPA FILTERS
Standard Acceptable Leakage
(1- 99.97%= 0.03%)
Aerosol Equip. 0.03 µg/m3
ASHRAE 52.2 4.89 x 105 p/ft3 0.021 µg/m3
ASTM F1471 2.1 x 105 p/ft3 0.009 µg/m3
EU 1822 1.05 x 103 p/ft3 0.00045 µg/m3
Consultants in Northern California in the San Francisco Bay area have been specifying mandatory testing of PHEAF devices (using aerosol generation) on asbestos abatement projects for the past 3 years.
• a leak in the seal against the filter housing (bead of silicone caulk can often fix it)• physically-damaged HEPA filter - small hole (dab of silicone caulk can fill it)• degraded HEPA filter (oil mist suspect) (may have to replace the HEPA filter)• there may be a design flaw in the equipment
IF YOUR EQUIPMENT FAILS