Does anyone know of any research or studies about the effects, and possible reduction of symptoms, of home ventilation systems on people with asthma or hay fever ?
Home ventilation systems are not common but are increasingly being installed in new housing with the objective of improving energy efficiency and air quality. A big issue with them is people usually don't clean or replace the filters often enough. HEPA (High Efficiency Particulate Air) filters are sometimes available for these systems and some specifications can filter out pollen.
I would like to learn more and would appreciate anyone who can send link to such research. Many thanks.