Face Shields Should Not be Worn Without Face Masks – Here’s Why
There continues to be a dispute about whether a face shield (sometimes called a “visor”) is as effective or more effective than a face mask.
There continues to be a dispute about whether a face shield (sometimes called a “visor”) is as effective or more effective than a face mask.
By Jim Rosenthal, CAFS As of today, August 8th, US health officials have reported nearly 5,000,000 cases of Covid-19 (officially SARS-Cov-2). Deaths are over 161,000.
By Jim Rosenthal, CAFS A MERV 13 filter and a box fan? It is definitely not a new idea. It has been floating around for
(Caution: Wearing a face shield without a mask could be hazardous to your health) By Jim Rosenthal July 14, 2020 – Canton of Graubunden, Switzerland
By Jim Rosenthal, CAFS “HEPA filters remove particles down to 0.3 microns. COVID-19 viruses are 0.125 microns so a HEPA filter cannot remove them from
Higher levels of PM2.5 have been shown to cause negative cardiovascular and respiratory health effects. Consequently, commercial and residential standards are being set to reduce
In a letter to the ASHRAE 52.2 Standard Setting Project Committee, the Air Conditioning, Heating and Refrigeration Institute (AHRI) has recommended not to adopt ISO
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
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
In the abstract – adopting ISO 16890 by the US sounds like a great idea. We would have one international air filter test standard replacing
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“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