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Improve SafetyFire Resistance Assembly ChartDeckConstruction TypeUL DesignNumberConcrete Floor/Ceiling AssembliesConcreteThicknessPanel or TileSize and TypeMaximum Panelor Tile ThicknessMaximumFixturePenetration(Ft 2 /100 Ft 2 )MaximumDuctPenetration(Ft 2 /100 Ft 2 )Concrete on Flat Cellular, Fluted or Blend Deck3-Hour – Exposed Grid A212 (200-3) 2-1⁄ 2" 48" X 48" ; PC5⁄8" 25 158 1, 236" X 60" ; PC30" X 60" ; PCD216 3-1⁄4" 24" X 24" To 30" X 60" ; P 5⁄8" (P Or PC) 24 576 1, 224" X 24" To 36" X 60" Or48" X 48" ; PC2-Hour – Exposed Grid D216 2-1⁄ 2" 24" X 24" To 30" X 60" ; P 5⁄8" (P Or PC) 24 576 1, 2, 324" X 24" To 36" X 60" Or48" X 48" ; PCConcrete on Ribbed or Corrugated Deck3-Hour – Exposed Grid G256 3-1⁄ 2" 24" x 24" ; P5⁄8" (P or PC) 24 255 1, 224" x 48" ; P or PC2-Hour – Exposed Grid G256 2-1⁄ 2" 24" x 24" ; P5⁄8" (P or PC) 24 576 1, 2, 324" x 48" ; P or PCG258 2-1⁄ 2" 24" x 24" ; P5⁄8" 24 113 1, 224" x 48" ; PG214 2-3⁄4" 24" x 48" ; P5⁄8" 17 57 1, 220" x 60" ; PConcrete on Metal Lath, Ribbed or Corrugated Deck3-Hour – Exposed Grid G229 (232-3) 3-1⁄4" 24" x 48" ; P or PC 5⁄8" 20 576 1, 22-Hour – Concealed Grid G022 (285-2) 2-1⁄ 2" 12" x 24" ; P 3⁄4" 16 57 42-Hour – Exposed Grid G209 (46-2) 3" 24" x 48" ; P or PC5⁄8" 8 None 1, 224" x 24" ; P or PCG244 (240-2)* 3" 24" x 48" ; P or PC5⁄8" 24* 576 1, 2, 324" x 24" ; P or P20" x 60" ; P or PCG210 (253-2) 2-1⁄ 2" 24" x 24" ; P 3⁄4" 24 113 1, 2G216 (74-2) 2-1⁄ 2" 24" x 48" ; P or PC5⁄8" 8 None 1, 224" x 24" ; PG217 (53-2) 2-1⁄ 2" 24" x 48" ; P or PC5⁄8" 8 57 1, 224" x 24" ; P or PC20" x 60" ; P or PCG229 (324-2) 2-1⁄ 2" 24" x 48" ; P or PC5⁄8" 20 576 1, 2, 324" x 24" ; P or PC20" x 60" ; P or PCG242 (210-2) 2-1⁄ 2" 24" x 48" ; P or PC 5⁄8" 8 None 1, 22-Hour – Exposed Grid G243 (230-2)* 2-1/2" 24" x 48"; P24" x 24"; P20" x 60"; PG236 (21-2) 2-1/2" 24" x 48"; P24" x 24"; PG250 2-1/2" 30" x 60"; P or PC20" x 60"; P or PC24" x 48"; P or PC24" x 24"; P1-Hour – Exposed Grid G241 (32-1) 2" 24" x 48" ; P24" x 24" ; PNote: Numbers in parentheses are original UL design numbers.Some unit sizes are no longer available as standard items; some designs include additional sizes.* Allows flat-board fixture protectionWhat You Need to Know to use this chartIf you are unfamiliar with UL Fire Resistance Ratings, begin witha review of meeting Code Requirements, pgs. 42-43.As explained there, these ratings are applied to certain types ofroof/ceiling and floor/ceiling construction assemblies, which aretested and assigned hourly ratings mandated by building codesor other building safety requirements.Reminders:1. UL tests rate an entire assembly. No ceiling or suspensionsystem product alone constitutes a fire rated assembly.2. You can use only the specific type, size and minimumthickness of Fire Guard ceilings or suspension systemidentified in each assembly.3. This table is a guide.(See UL Fire Resistance Directory for complete design details).To purchase a copy of the UL Directory:Underwriters Laboratories, Inc.Publications Stock333 Pfingsten Rd.Northbrook, IL 60062(Tel.) 847-272-8800,ext. 42612 or 42622Key to Panel and Tile TypesPC = Ceramaguard ®P = All other products designated Fire Guard in this catalog5/8" 16 576 1, 2, 35/8" None None 1, 25⁄8" 20 113 1, 25⁄8" None None 1, 2Key to Grid System Types1 = AFG and FST 6000 – Prelude Fire Guardand XL ® Fire Guard with steel cap2 = AFG-A and FST 6000A – Prelude Plus Fire Guardand XL Fire Guard with aluminum cap3 = FSLK – Suprafine ® Fire Guard with steel capSuspensionSystemsReference – Fire resistive assembliesTechLine SM 877 ARmSTRONG armstrong.com/commceilings 342