Product Guide Air Filter Systems Behind the recommendations Related articles Behind the recommendations Related articles Air Filter Systems MERV 13 or higher filters from major manufacturers as well as proven technologies that remove harmful or nuisance gases More about Air Filter Systems Carpeting, Indoor Air Quality, and the Environment Our look at carpets addresses the indoor air quality (IAQ) concerns and also some broader environmental questions. Air Filtration in Buildings ASHRAE Standard Revised to Cut Excess Ventilation
