Air Louvers VLF ThruBolt™ Vision Lites with Mullions combine the strength of the ThruBolt™ frame design with welded steel mullions to create a divided lite appearance while maintaining fire-rated performance. Built from 18 gauge steel, these vision lites use thru-bolt fasteners to provide secure installation while allowing architects and contractors to incorporate decorative or security-focused divided lite configurations. Mullions are welded to both sides of the frame and butt to the glazing while maintaining the use of a single glass pane, making this configuration suitable for commercial door openings requiring durability, design flexibility, and code-compliant fire performance.

Specifications
Application: Standard 1-3/4″” door thickness
Glazing thickness: 3/16″” – 1/4″”
Frame material: 18 gauge cold rolled steel
Standard finish: Mineral bronze powder coat
Fasteners: #8-32 flathead Phillips thru-bolts with blank heads on one side
Minimum size: 4″” x 4″”
Maximum size: Based on glazing listing and door manufacturer approval
Fire ratings: Up to 180 minutes depending on glazing size and listing
UL listings: ANSI/UL 10B, ANSI/UL 10C, CAN/ULC S104
Mullion width: 1″”
Mullion depth: 5/8″”
Mullion construction: Welded to both sides of frame and butted to glass
Mullion configurations: Multiple column and row configurations available
Optional mullion sizes: 1/2″” x 1/2″”, 1/2″” x 3/4″”
Optional materials: 304 stainless steel, galvanneal steel, zinc-plated steel
Compatible fire-rated glazing: Firelite, Pyran Platinum F, Fireglass, WireShield
Compatible non-rated glazing: Tempered glass
Optional fasteners: Torx screws
PAK options: Vision lite, glazing, and glazing tape kits available

Downloads

Download Vision-Lite-VSLR-Submittal.pdf