This ceiling mounted air filter system can clean up to 98% of airborne contaminates without affecting existing room temperatures. features continuous duty low noise motor easy clean double filter design and heavy gauge steel cabinet. primary filter: 5 microns. secondary filter: 1 micron. moves 510 cfm of air. measures 30-5/16-Inch x 24-Inch x 12-3/16-Inch. case certified meeting can/case c22.2 #243-m91 and up 1017-4th standards..