This presentation set out a computational model for filter sizing and barn pressure dynamics in filtered swine facilities, developed at the University of Minnesota. The model addresses how a filter bank and the ventilation system it sits in behave together as the filters load.
Modelling occupies the space between the efficacy literature and the field measurements. Dee and colleagues established in 2005 that MERV 14 filtration prevented PRRSV aerosol transmission under controlled conditions, and the herd studies that followed showed the effect at farm scale. What neither addresses is how a specific building with a specific fan set, static pressure budget and filter area will behave once the media begins to load. Ramirez and Hoff in 2016 provided the engineering framework for that question, and Smith, Holck and Carman in 2019 supplied field measurements of airflow reduction on commercial sites.
The reason this matters on a working site is that filtration is a pressure decision as much as an efficiency decision. Media that captures more also resists more, and a fan set selected for an unfiltered building will not deliver its rated airflow through a loaded bank. Whether the ventilation requirement is still met at the end of a filter's service life, rather than at the beginning, is the question a sizing model exists to answer. That question is best settled before a system is installed rather than during the first summer it is asked to work.