Camfil Farr tagline Camfil Farr Logo
Login Home Rep Locator Catalog IAQ Calculator Literature Library
Related Information
Electrostatic Media
Filter Efficiency
Mechanical Media
MERV examples

Site Features
Air Quality
Anthrax
Available Literature
Containment Systems
Current Events
Cytotoxicity
Fiber Size
Health Care
IAQ Analysis
MERV
Mold
Pharmaceutical
SARS
School IAQ

Minimum Efficiency Reporting Value

Most filters incorporating mechanical principles of particle capture become more efficient as they load with dirt. Rather than provide an average efficiency, the committee developed a methodology of reporting a lowest point efficiency value. In this manner, the user would know how efficient the filter is at its lowest point, which in most cases is as soon as it is installed in the system. Other test procedures provide an average efficiency, which may require extensive time to reach in actual operation.