WB EXT-GY 3150 Series

Glass Fiber Reinforced Cement (GFRC) Hinged Exterior Access Panels

Sizes & Specifications

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Exterior Hinged Ceiling Panel Offers a Stealth Appearance that Blends Seamle

The WB EXT-GY 3150 Series Glass Fiber Reinforced Cement (GFRC) Hinged Exterior Ceiling Access Panel is a durable, flush access panel for ceiling installation that is perfect for exterior applications where corrosion/moisture resistance and a concealed appearance is required. Featuring lightweight, 5/8″ glass fiber reinforced cement construction that offers high compressive strength with no warping, cracking or sagging, panels are also rust proof and moisture resistant to prevent mold and fungus growth. Panels are ideal for exterior applications including soffits, porte-cochere, covered drive-up or any other exterior locations.


  • Door: 5/8″ Lightweight Glass Fiber Reinforced Cement
  • Frame & Trim: 5/8″ Lightweight Glass Fiber Reinforced Cement, 3″ Wide Flange
  • Finish: Unpainted Natural GFRC, Paintable Surface
  • Latches: Flush Cam Latch
  • Hinges: Concealed Hinge
  • Application: Walls, Ceilings, Exterior Use


  • Locks: Key Operated Lock
  • Custom Sizes: Available on Request


The WB EXT-GY 3150 GFRC exterior access panel is available in a wide variety of sizes including 9×9, 12×12, 18×18, 24×24, and more. In addition, custom sizes are available upon request. Panel features a concealed hinge and flush cam latch. Options include locks.

Manufactured for The Williams Brothers Corporation of America. MADE IN USA.