Tex-Air Filters

Air Filter Manufacturing, Sales & Service

Jim Rosenthal

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Analysis Shows ISO 16890 Uses Outdated and Inaccurate Particle Distribution Data

In a recent paper entitled “Evaluating the Sensitivity of the Mass-Particle Removal Calculations for HVAC Filters in ISO 16890 to Assumptions for Aerosol Distributions” the author, Dr. Brent Stephens of the Illinois Institute of Technology, found that the particle distribution data used in ISO 16890 was outdated and inaccurate.  The paper was published in the … More

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ASHRAE 62.2 and ISO 16890 – Not a Good Fit

A recent development affecting the air filter industry is the addition of Addendum k to Standard ASHRAE 62.2-2016 (Ventilation and Acceptable Indoor Air Quality in Low-Rise Residential Buildings) to include air filter classifications from International Standard ISO 16890.  The purpose is to add “an alternative method providing PM2.5 efficiency data” to the ASHRAE 52.2 MERV … More

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What Happens to the Electret Charge on a MERV 11 Pleated Filter in Service?

Pleated filters using electret media have some distinct advantages over pleated filters using mechanical only media.  The most important advantages of electret media filters is that they have lower pressure drop (resistance) and higher efficiency on smaller particles. In most cases the advantage of higher particle capture efficiencies for electret pleated filters are reduced as … More

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Have You Read the ISO 16890 Standard?

In the abstract  – adopting ISO 16890 by the US sounds like a great idea.  We would have one international air filter test standard replacing EN779 and ASHRAE/ANSI 52.2.  This would reduce confusion, increase the size of the market and make it easier for professionals to specify air filters for a variety of applications. Unfortunately, … More

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Do Air Filters and Air Cleaners Provide Health Benefits?

(This article was originally written by Jim Rosenthal and published in April of 2006 on http://www.allergyclean.com ) Air cleaners and air filters alone have not been shown to be clinically effective at reducing allergy symptoms. Last year I was very fortunate to be able to participate in a round table discussion on indoor air research. This meeting … More

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Tex-Air Filters Opens New San Antonio Branch

We are pleased to announce the opening of our newest branch office and warehouse in San Antonio. The facility is conveniently located at 2416 Brockton Street, Suite 101, San Antonio 78217 and is fully stocked with filters, belts, coil cleaners and other products needed for effective HVAC filter maintenance. “We have had numerous requests from … More

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ISO 16890 Uses Questionable Air Filter Classification System

“7 Classification system based on particulate matter efficiency (ePM) 7.1 Definition of a standardized particles size distribution of ambient air To evaluate air filters according to their ePM efficiencies, standardized volume distribution functions of the particle size are used which globally represent the average ambient air of urban and rural areas, respectively.  Typically in the … More

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ISO 16890 Should not be Adopted as the US Air Filter Testing Standard – Continued

  After publishing this article: https://www.texairfilters.com/the-usa-should-not-adopt-iso-16890-for-air-filter-testing-heres-why/ on Linkedin, we had a very good discussion about the pros and cons of the US adopting ISO 16890 as our air filter test standard.  This article is taken from that discussion.  I have omitted some comments and the names of participants, have shortened the comments of other participants (although I … More