A civil approach to facemask filtration
Standardized facemasks typically fall into one of two categories — surgical or respirator. Both variants are designed to offer various levels of protection against the transmission of bacteria and other particulates. World facemask guidelines are about science, but go beyond that. The science is defined by test methods that each region/country espouses. As a rule …
Filtration in the age of COVID-19
There are many different facemasks in the market today – from do-it-yourself cut and sew barrier masks to highly engineered products that require testing and certification to be used. In the age of COVID-19, the term “facemask” is, in some cases, being used generically, when there are different types of facemasks with varying degrees of …
Perspectives & challenges in IAQ – takeaways from AHR Expo
I made the trip to Orlando in February for the 2020 AHR Expo. I traveled to this event with the objective of determining the level of interest in an INDA (Association of the Nonwoven Fabrics Industry)-sponsored Indoor Air Quality coalition. Walking the show allowed me to meet in person with potential IAQ coalition members from …
How fiber diameter & size affect filtration performance
There are three primary property considerations of fibers for filtration performance — the choice of fibers, the process of producing the media and the final application. When it comes to performance, the fundamental fiber properties are those that are designed to optimize volume, air permeability, and the pore size of the material. …
Spiral-wound cartridges for desalination
A spiral-wound element has significant surface area, resulting in extremely high packing density. The filter is also easy to install and maintain in the system, and it offers a long life due to the durability of the spiral-wound element. The history of desalination dates back to Aristotle and other intellectuals in ancient Greece. In the …