Filtration Products for Infections Respitory Illnesses

Posted:04/21/2020

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From a filtration point of view, the droplets from infectious viruses must be removed from the air. Recognized authorities have recommended filters with MERV ratings of MERV-13 or MERV-14 to accommodate normal operating conditions in public spaces such as commercial buildings and certain public areas within hospitals for example. While these stated filter efficiencies will offer some level of droplet capture, for individuals wishing to take additional precautions and further reduce their risk during this time, Filter Sales and Service, Inc. recommends the following air filtration solutions or their equivalent.

Standard Risk Areas

For standard risk areas such as commercial office and retail buildings, schools, airports, manufacturing facilities, and areas not occupied by individuals confirmed with COVID-19, if the current configuration of HVAC ventilation system allows, the minimum efficiency recommended is a MERV 15/15A. To extend the service life, a prefilter of a lesser MERV rating should be installed upstream if possible. Healthcare facilities should refer to the most current version of ANSI/ASHRAE/ASHE Standard 170 for guidance. We recommend
Prefilter: Camfil 30/30 Dual 9
Followed by: Camfil Hi-Flo ES or Durafil ES2

Higher Risk Areas
For higher risk areas such as those that regularly house individuals in the CDC high risk category, areas in which individuals confirmed to have contracted COVID-19 occupy or for any other reason a higher level of protection is desired, if the current configuration of HVAC ventilation system allows, the minimum efficiency recommended is a 99.97% HEPA filter with appropriate prefiltration of lesser MERV value. Healthcare facilities should refer to the most current version of ANSI/ASHRAE/ASHE Standard 170 for guidance.
Depending upon system configurations, Filter Sales recommends:

Prefilter: 30/30 Dual 9, Hi-Flo ES or Durafil ES2
Followed by: Absolute VG®, Filtra 2000® or XH Absolute®

Existing HVAC Ventilation Systems
Some existing HVAC ventilation systems may not be configured for multiple stage filtration or to withstand the higher pressure drop that comes with HEPA filters. As an alternative, consider adding a stand-alone room air purifier with a minimum of MERV 15/15A. Camfil recommends:
City M Air Purifier.
The City M comes with both 99.95% HEPA filter and a molecular filter to control other gaseous contaminants.

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