Note: Sizes shown may not be available in all "styles" of each model | See specific spec sheet for complete details.

C/F = Call Factory Updated: February 24, 2011
INTERACTIVE APPLICATION GUIDE  (Current UL Approved Maximum damper sizes, width x height in inches)
Consult Ruskin for solutions on application sizes larger than shown below.
UL555 & UL555S Combination Fire And Smoke Rated Dampers (Multi-Blade Dynamic-Rated) Return to top
Product Models Walls Floors One-Side Angle Installation "Out of
Wall/Floor"		 Grille Access in Shafts Round Duct Fire Stop
(no angles) Installation		 "Tunnel" Corridor
Ceilings 		Roof/Floor
Ceiling
Assemblies 		Smoke Detector
FSD60 / 1.5hr / Class 1 / AirFoil 120x96 120x96 or 144x64 90x48 or 48x90     94 90x48     Yes
FSD60M - Modulating / Class 1 120x48 120x48               Yes
FSD60-2 /1.5hr / Class 2/ AirFoil 120x96 120x96 or 144x64 90x48 or 48x90     94 90x48     Yes
FSD60-V /1.5hr / Class2 / Vertical Blade / AirFoil 48x32   48x32     30 48x32     Yes
FSD60-3 / 3hr / Class 1 / AirFoil 120x96 120x96 or 144x64       94 90x48     Yes
FSD60-3M / 3hr / Modulating / Class I / Airfoil 120x48 120x48                
FSD60FA / 1.5hr / Class 1 / Front Access / AirFoil         36x36 C/F       C/F
FSD36FA / 1.5hr / Class 2/ Front Access / 3V         36x36 C/F       C/F
FSD "OW" / 1.5 hr Out of Wall/Floor       36x36   34       Yes
FSD "GA" / 1.5 hr. / Grill Access         36x36 34        
FSD37 / 1.5hr / Class1 / 3V Groove 120x96 120x96 or 144x64 90x48 or 48x90     94 90x48     Yes
FSD36 / 1.5hr / Class2 / 3V Groove 126x96 144x96 90x48 or 48x90     94 90x48     Yes
FSD35 / 1.5hr / Class3 / 3V Groove 126x96 144x96 90x48 or 48x90     94 90x48     Yes
FSD37SS / Stainless / 1.5hr / Class 1/ 3V
 90x32   90x32              
FSD36SS / Stainless / 1.5hr / Class 2/ 3V 90x48   90x48              
FSD35SS / Stainless / 1.5hr / Class 3/ 3V 90x48   90x48              
FSDR25 / 1.5Hr / Class 1 / "True Round" 24 24 24     24       C/F
FSD60/36C / 1hr / Tunnel Corridor           22   24x24   C/F
DFSDR1 / 1hr / Tunnel Corridor           12   12   C/F
UL555S Smoke Dampers (Multi-Blade Dynamic-Rated) Return to top
Product Models Walls Floors One-Side Angle Installation "Out of
Wall/Floor"		 Grille Access in Shafts Round Duct Fire Stop
(no angles) Installation		 "Tunnel" Corridor
Ceilings 		Roof/Floor
Ceiling
Assemblies 		Smoke Detector
SD60 / Class 1 / Airfoil Blades
 144x96, 288x48, or 72x144 144x96, 288x48, or 72x144       94       Yes
SD60M / Modulating Class I / Airfiol Blades 120x48 120x48                
SD60-2 / Class 2 / Airfoil Blades
 144x96, 288x48, or 72x144 144x96, 288x48, or 72x144       94       Yes
SD50 / Class 1 / Aluminum Airfoil 144x96, 288x48, or 72x144 144x96, 288x48, or 72x144       94       Yes
SD37 / Class 1 / Airfoil or 3V
 144x96, 288x48, or 72x144 144x96, 288x48, or 72x144       94       Yes
SD36 / Class 2 / 3V Blades
 144x96, 288x48, or 72x144 144x96, 288x48, or 72x144       94       Yes
SD35 / Class 3 / 3V Blades
 144x96, 288x48, or 72x144 144x96, 288x48, or 72x144       94       Yes
SDRS25 / Class 2 / True Round
 24 24       24       C/F
UL555 Static "Fans Off" Fire Dampers (IBD) Curtain Type or (FD) Multiple Blade Type Return to top
Product Models Walls Floors One-Side Angle Installation "Out of
Wall/Floor"		 Grille Access in Shafts Round Duct Fire Stop
(no angles) Installation		 "Tunnel" Corridor
Ceilings 		Roof/Floor
Ceiling
Assemblies 		Smoke Detector
IBD10 / 1.5 hr / Integral Sleeve & Angle 36x36   36x36     31        
IBD2GA / 1.5 hr / Grille Access         36x36          
IBD2OW / 1.5 hr / Out of Wall/Floor       36x36   34        
IBD20, 40, 60 / 1.5hr / Integral Sleeve 84x72 84x84 84x48 or 48x84     31 84x48      
IBD2 / 1.5hr / No Sleeve 120x72 90x91 90x48 or 48x90     85 90x48      
IBDT / 1.5hr / Thinline 40x48 60x12 40x48       40x48      
IBD230, 430, 630 / 3hr / Integral Sleeve 84x72 84x84       31 84x48      
IBD23 / 3 hr / No sleeve 90x72 90x91       85 90x48      
FD35 / 1.5hr / 3V Blades / No sleeve 120x96 120x96 90x48 or 48x90       90x48      
FD60 / 1.5hr / AirFoil Blades / No sleeve 120x96 120x96 90x48 or 48x90       90x48      
FD60-3 / 3hr / Airfoil Blades 120x96 120x96                
FD35SS / 1.5hr. / 3vBlades / No Sleeve 90x48 90x48         90x48      
FD60OW / 1.5hr / Out of Wall/Floor       32x36            
FD60GA       32x36            
FD35GA / 1.5hr / Grille Access       32x36            
UL555 Dynamic "Fans On" Fire Dampers (DIBD) Curtain Type or (DFD) Multiple Blade Type Return to top
Product Models Walls Floors One-Side Angle Installation "Out of
Wall/Floor"		 Grille Access in Shafts Round Duct Fire Stop
(no angles) Installation		 "Tunnel" Corridor
Ceilings 		Roof/Floor
Ceiling
Assemblies 		Smoke Detector
DIBD10 / 1.5 hr / Integral Sleeve & Angle
 33x36   33x36     31        
DIBD2GA / 1.5 hr / Grille Access         36x36          
DIBD2OW / 1.5 hr / Out of Wall/Floor       36x36            
DIBD2 / 1.5 hr / No Sleeve
 72x48, 48x72 or 120x24 36x48 72x48 or 48x72     34 72x48 or 48x72      
DIBD2SS / 1.5hr / No Sleeve 72x48   72x48              
DIBD20, 40, 60 / 1.5 hr / Integral Sleeve
 72x48 or 48x72 36x48 72x48 or 48x72     31 72x48 or 48x72      
DIBD23 / 3 hr / No Sleeve
 72x48 or 48x72 36x48       31 72x48 or 48x72      
DIBD230, 430, 630 / 3 hr / Integral Sleeve
 72x48 or 48x72 36x48       31 72x48 or 48x72      
FD35SS / 1.5hr. / 3vBlades / No Sleeve 90x48   90x48       90x48      
FD35OW / 1.5hr / Out of Wall/Floor 36x36
FDR25 / 1.5hr / "True Round" 24 24 24     24        
DFD35 72x96 or 126x48 72x96 or 126x48 90x48 or 48x90       90x48      
DFD60 64x96 or 120x48 64x96 or 120x48 90x48 or 48x90       90x48      
DFD60-3 60x96/ 120x48 60x96/ 120x48                
DFD35SS 90x48 90x48                
UL555C Ceiling Fire Dampers Return to top
Product Models Walls Floors One-Side Angle Installation "Out of
Wall/Floor"		 Grille Access in Shafts Round Duct Fire Stop
(no angles) Installation		 "Tunnel" Corridor
Ceilings 		Roof/Floor
Ceiling
Assemblies 		Smoke Detector
CFD (R) 2, 3, 4, 5 / Rect or Round           20     24x24  
CFD7 / Wood Joist                 16x12  
CFD7(T) / Wood Truss                 18x18  
CFD (R) 2W, 3W, 4W, 5W / Wood Truss           20     24x24  
DFSDR1 / Motorized ceiling damper                 12  
C/F = Call Factory Updated: January 8, 2010 10:13 AM