Rigid Box Filters Rigid Box Filters Available in MERV 12, MERV 13, MERV 14, and MERV 15Available in wide range of standard sizesRigid metal frame design concept improves performance and durabilityAerodynamic filter design by radial V-Pleats with die cut stabilizers resulting in a rigid and stable filterConsistent performance under various operating conditionsUL 900 Classified Data Sheets CMS Rigid Pac Filter Contact Us