Features 12 Gauge Security Grille and Two-Piece Thru-bolt Louver Design. Recommended for  Vandal-Proof Building Design.

Material: 18 gauge CRS frame and blades; 12 gauge CRS security grille. Min size 6" x 6", Max 36" x 80". Multiple sections can be combined for larger sizes.

Construction:
Louvers:  2 rows of inverted, split "Y" blades with 1" blade spacing are attached to welded frame with interlocking construction. Non-vision.

Security Frame: Security grille is welded to the interior and exterior of louver with 13/16" square openings 1" on-center. Thru-bolted door.

Door:  For 1-3/4"Doors. Door cutout = order size.

Fasteners: #8 x 32 Phillips head thru-bolts with blank head one side.

Powder Coat Finishes: (B) Mineral Bronze (standard color), (G) Gray, (BK) Black, (FBK) Flat Black, (W) White, (SB) SC Beige, (SA) Satin Aluminum, (S) Sand, (AB) AMS Beige, (R) Red, (GH) Gray Hammertone

Free Flow Area: 40% free area.