14" x 12" R-4 FLANGED REGISTER BOX

1" perimeter flange provided for easy installation.
Design includes 1/2" drywall lip and rounded corners for added safety.
Opening 1/4" oversized to accommodate register/grille.
Dual Bead design for added strength.
Black diffuser board coated with EPA registered anti-microbial protective acrylic agent along air stream side.