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Model GC - Grid Core Returns             Application Recommended for general return or exhaust of room air High free area offering lowest sound and pressure levels “Egg Crate” construction similar in appearance to many lighting fixtures Surface mounted or suspended grid systems Product Features 1/2" x 1/2" x 1/2" aluminum core Aluminum frame Registers include a factory attached, steel opposed blade volume control damper Surface mounting holes in frame neatly countersunk for supplied #8 x 1-1/2" oval head screws Arctic White baked-on finish Maximum size one piece construction is 48" x 48". Larger sizes shipped in multiple sections for field assembly. Options 304 or 316 stainless steel construction with satin polish finish Factory applied gasket material to frame Aluminum or stainless steel opposed blade volume control dampers Custom or optional paint colors   Product Description Performance Data - GC5 Performance Data - GC5NS 45° No-Site Typical Specification Features at a Glance Extension Panels Mounting Hole Chart Optional Finishes         Submittals Model Mounting Features Material Aluminum Stainless Steel GC5 Surface Mounted   • • Lay-In T-Bar Without Screw Holes • • Lay-In T-Bar With Extension Panel • N/A 9/16" Narrow Slot • N/A Tegular • N/A Concealed Spline • N/A GC5L Lay-In T-Bar Narrow Border • N/A GC5C Lay-In T-Bar Core Only • N/A GC51 Surface Mounted 1/2" x 1/2" x 1" Core • N/A GC5-L-RT Lay-In T-Bar Roto-Throw with Extensional Panel • N/A GC5-D-RT 9/16" Narrow Slot • N/A GC5-T-RT 15/16" Tegular • N/A GC5-C-RT Concealed Spline • N/A GC5NS Surface Mounted 45° No-Site Core • N/A GC5LNS Lay-In T-Bar 45° No-Site Core • N/A Accessories OBD - Opposed Blade Volume Control Damper SRA - Square to Round Adapter LS - Light Shield RSA - Return Sound Attenuator Concealed Fastening

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