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Interview with Mack Barnhardt on eliminating sewer odors in Rooftop Gardens by Linda of Rooftopgarden.com
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Green Projects

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IAQ TIP
ASHRAE Testing
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Real World Efficiencies?
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Relative Particle Sizes


What is in the Air?

Our Manufactures

Basic Principles of Filtration

Whether your filtration is for air or water it comes down to removing particles by a form of filter's to protect or improve. How we remove these particles depend on how you want to use current or past filtration technology.

There are 3 Requirements in Filtration
1) Correct Range for Efficiency 2) Sealed Filter's 3) Installed Correctly

Particle Filtration for Air Filters

Range 1 Size 0.3 to 1.0 Microns Range 2 Size 1.0 to 3.0 Microns Range 3 Size 3.0 to 10.0 Microns Group 1: Home Filtration, Basic Equipment MERV *Efficiency Blow-Thru MERV *Efficiency Blow-Thru MERV *Efficiency Blow-Thru 1 Not Tested 1 Not Tested 1 <20% >80% 2 2 2 <20% >80% 3 3 3 <20% >80% 4 4 4 <20% >80% Group 2: Manufacturing, Low-End Commercial Filtration MERV *Efficiency Blow-Thru MERV *Efficiency Blow-Thru MERV *Efficiency Blow-Thru 5 Not Tested 5 Not Tested 5 <20% >80% 6 6 6 <35% >65% 7 7 7 <50% >50% 8 8 8 <70% >30% Group 3: Commercial, High-End Residential Filtration MERV *Efficiency Blow-Thru MERV *Efficiency Blow-Thru MERV *Efficiency Blow-Thru 9 Not Tested 9 <50% >50% 9 <85% >15% 10 10 <50% >50% 10 <85% >15% 11 11 <65% >35% 11 <85% >15% 12 12 <80% >20% 12 <90% >10% Group 4: Superior Commercial & Hospital Filtration MERV *Efficiency Blow-Thru MERV *Efficiency Blow-Thru MERV *Efficiency Blow-Thru 13 <75% >25% 13 <90% >10% 13 <90% >10% 14 <75% >25% 14 <90% >10% 14 <90% >10% 15 <85% >15% 15 <90% >10% 15 <90% >10% 16 <95% >5% 16 <95% >5% 16 <90% >10% Group 5: Clean Rooms, Pharmaceutical, Museum Filtration MERV *Efficiency Blow-Thru MERV *Efficiency Blow-Thru MERV *Efficiency Blow-Thru 17 >99.97% on 0.3 17 Not Tested 17 Not Tested 18 >99.99% on 0.3 18 18 19 >99.999% on 0.3 19 19 20 >99.999% on 0.1/.2 20 20 *Efficiency: low number was used see chart for full range

Deposition of Inhaled Particles in Human Respiratory System Aerodynamic Diameter (μm) Likely Region of Deposit >9.0 μm Filtered out by Nose 6.0-9.0 μm Deposited in Pharynx 4.6-6.0 μm Deposited in Trachea & Primary Bronchi 3.3-4.6 μm Deposited in Secondary Bronchi 2.15-3.3 μm Deposited in Terminal Bronchi 0.41-2.15 μm Deposited in the Alveoli <0.41 μm May be exhaled* or enter further into body Occupational asthma, and main substances involved. Link: http://en.wikipedia.org/wiki/Occupational_asthma#Occupations_at_risk   *ultrafine particles may be collected through diffusional effects