Fire-Smoke Damper Properties
Blade Style
Fire Resistance Ratings
Temperature Ratings
Leakage Rating
Static Pressure
Air Velocity
Air Performance Stats
Damper Sizing
Max Single Panel Size
Mount Orientation
Actuator Closure Type
Frame Shape
![](/tools\uss\Louvers & Dampers\21 [Combination Fire-Smoke Dampers]\02 [3 Hour Rated]\03 [LA1]\thumb_LD - LA1.png)
Model: LA1
Frame Type: 5-1/2" x 16ga w/ Airfoil Blade
Material: Galvanized Steel
Temperature Rating: 250°/350°
Max Velocity: 2000 fpm @
4 in wg
Max Horizontal Panel Size: 30" x 48"
Max Vertical Panel Size: 30" x 48"
![](/tools\uss\Louvers & Dampers\21 [Combination Fire-Smoke Dampers]\02 [3 Hour Rated]\04 [LA2]\thumb_LD - LA2.png)
Model: LA2
Frame Type: 5-1/2" x 16ga w/ Airfoil Blade
Material: Galvanized Steel
Temperature Rating: 250°/350°
Max Velocity: 2000 fpm @
4 in wg
Max Horizontal Panel Size: 30" x 48"
Max Vertical Panel Size: 30" x 48"
![](/tools\uss\Louvers & Dampers\21 [Combination Fire-Smoke Dampers]\02 [3 Hour Rated]\05 [LA2M]\thumb_LD - LA2M.png)
Model: LA2M
Frame Type: 5-1/2" x 16ga w/ Airfoil Blade
Material: Galvanized Steel
Temperature Rating: 250°
Max Velocity: 2000 fpm @
4 in wg
Max Horizontal Panel Size: 24" x 24"
Max Vertical Panel Size: 24" x 24"
![](/tools\uss\Louvers & Dampers\21 [Combination Fire-Smoke Dampers]\01 [1.5 Hour Rated]\11 [MA1]\thumb_LD - MA1.png)
Model: MA1
Frame Type: 5-1/2" x 16ga w/ Airfoil Blade
Material: Galvanized Steel
Temperature Rating: 250°/350°
Max Velocity: 2000 fpm @
4 in wg
Max Horizontal Panel Size: 32" x 48"
Max Vertical Panel Size: 32" x 48"
![](/tools\uss\Louvers & Dampers\21 [Combination Fire-Smoke Dampers]\01 [1.5 Hour Rated]\14 [MA1GF]\thumb_LD - MA1GF.png)
Model: MA1GF
Frame Type: 5-1/2" x 16ga w/ Airfoil Blade
Material: Galvanized Steel
Temperature Rating: 250°/350°
Max Velocity: 2000 fpm @
4 in wg
Max Horizontal Panel Size: 32" x 42"
Max Vertical Panel Size: 32" x 42"
![](/tools\uss\Louvers & Dampers\21 [Combination Fire-Smoke Dampers]\01 [1.5 Hour Rated]\12 [MA2]\thumb_LD - MA2.png)
Model: MA2
Frame Type: 5-1/2" x 16ga w/ Airfoil Blade
Material: Galvanized Steel
Temperature Rating: 250°/350°
Max Velocity: 2000 fpm @
4 in wg
Max Horizontal Panel Size: 32" x 48"
Max Vertical Panel Size: 32" x 48"
![](/tools\uss\Louvers & Dampers\21 [Combination Fire-Smoke Dampers]\01 [1.5 Hour Rated]\15 [MA2GF]\thumb_LD - MA2GF.png)
Model: MA2GF
Frame Type: 5-1/2" x 16ga w/ Airfoil Blade
Material: Galvanized Steel
Temperature Rating: 250°
Max Velocity: 2000 fpm @
4 in wg
Max Horizontal Panel Size: 32" x 42"
Max Vertical Panel Size: 32" x 42"
![](/tools\uss\Louvers & Dampers\21 [Combination Fire-Smoke Dampers]\01 [1.5 Hour Rated]\13 [MA2M]\thumb_LD - MA2M.png)
Model: MA2M
Frame Type: 5-1/2" x 16ga w/ Airfoil Blade
Material: Galvanized Steel
Temperature Rating: 250°
Max Velocity: 2000 fpm @
4 in wg
Max Horizontal Panel Size: 24" x 24"
Max Vertical Panel Size: 24" x 24"
![](/tools\uss\Louvers & Dampers\21 [Combination Fire-Smoke Dampers]\01 [1.5 Hour Rated]\02 [MR1]\thumb_LD - MR1.png)
Model: MR1
Frame Type: 5-1/2" x 16ga w/ Single Thickness Blade
Material: Galvanized Steel
Temperature Rating: 250°/350°
Max Velocity: 2000 fpm @
4 in wg
Max Horizontal Panel Size: 24" x 24"
Max Vertical Panel Size: 24" x 24"
![](/tools\uss\Louvers & Dampers\21 [Combination Fire-Smoke Dampers]\01 [1.5 Hour Rated]\03 [MR2]\thumb_LD - MR2.png)
Model: MR2
Frame Type: 5-1/2" x 16ga w/ Single Thickness Blade
Material: Galvanized Steel
Temperature Rating: 250°/350°
Max Velocity: 2000 fpm @
4 in wg
Max Horizontal Panel Size: 24" x 24"
Max Vertical Panel Size: 24" x 24"
![](/tools\uss\Louvers & Dampers\21 [Combination Fire-Smoke Dampers]\01 [1.5 Hour Rated]\04 [MS1]\thumb_LD - MS1.png)
Model: MS1
Frame Type: 5-1/2" x 16ga w/ Single Thickness Blade
Material: Galvanized Steel
Temperature Rating: 250°
Max Velocity: 2000 fpm @
4 in wg
Max Horizontal Panel Size: 36" x 48"
Max Vertical Panel Size: 36" x 48"
![](/tools\uss\Louvers & Dampers\21 [Combination Fire-Smoke Dampers]\01 [1.5 Hour Rated]\06 [MS1SS]\thumb_LD - MS1SS.png)
Model: MS1(SS)
Frame Type: 5-1/2" x 16ga w/ Single Thickness Blade
Material: Stainless Steel
Temperature Rating: 250°
Max Velocity: 2000 fpm @
4 in wg
Max Horizontal Panel Size: 24" x 24"
Max Vertical Panel Size: 36" x 32"
![](/tools\uss\Louvers & Dampers\21 [Combination Fire-Smoke Dampers]\01 [1.5 Hour Rated]\09 [MS1GF]\thumb_LD - MS1GF.png)
Model: MS1GF
Frame Type: 5-1/2" x 16ga w/ Single Thickness Blade
Material: Galvanized Steel
Temperature Rating: 250°
Max Velocity: 2000 fpm @
4 in wg
Max Horizontal Panel Size: 36" x 42"
Max Vertical Panel Size: 36" x 42"
![](/tools\uss\Louvers & Dampers\21 [Combination Fire-Smoke Dampers]\01 [1.5 Hour Rated]\05 [MS2]\thumb_LD - MS2.png)
Model: MS2
Frame Type: 5-1/2" x 16ga w/ Single Thickness Blade
Material: Galvanized Steel
Temperature Rating: 250°
Max Velocity: 2000 fpm @
4 in wg
Max Horizontal Panel Size: 36" x 48"
Max Vertical Panel Size: 36" x 48"
![](/tools\uss\Louvers & Dampers\21 [Combination Fire-Smoke Dampers]\01 [1.5 Hour Rated]\07 [MS2SS]\thumb_LD - MS2SS.png)
Model: MS2(SS)
Frame Type: 5-1/2" x 16ga w/ Single Thickness Blade
Material: Stainless Steel
Temperature Rating: 250°/350°
Max Velocity: 2000 fpm @
4 in wg
Max Horizontal Panel Size: 24" x 24"
Max Vertical Panel Size: 36" x 32"
![](/tools\uss\Louvers & Dampers\21 [Combination Fire-Smoke Dampers]\01 [1.5 Hour Rated]\08 [MS2C]\thumb_LD - MS2C.png)
Model: MS2C
Frame Type: 5-1/2" x 16ga w/ Single Thickness Blade
Material: Galvanized Steel
Temperature Rating: 250°
Max Velocity: 2000 fpm @
4 in wg
Max Horizontal Panel Size: 24" x 24"
Max Vertical Panel Size: 24" x 24"
![](/tools\uss\Louvers & Dampers\21 [Combination Fire-Smoke Dampers]\01 [1.5 Hour Rated]\10 [MS2GF]\thumb_LD - MS2GF.png)
Model: MS2GF
Frame Type: 5-1/2" x 16ga w/ Single Thickness Blade
Material: Galvanized Steel
Temperature Rating: 250°
Max Velocity: 2000 fpm @
4 in wg
Max Horizontal Panel Size: 32" x 42"
Max Vertical Panel Size: 32" x 42"
![](/tools\uss\Louvers & Dampers\21 [Combination Fire-Smoke Dampers]\02 [3 Hour Rated]\01 [MT1]\thumb_LD - MT1.png)
Model: MT1
Frame Type: 5-1/2" x 16ga w/ Single Thickness Blade
Material: Galvanized Steel
Temperature Rating: 250°/350°
Max Velocity: 2000 fpm @
4 in wg
Max Horizontal Panel Size: 30" x 48"
Max Vertical Panel Size: 36" x 48"
![](/tools\uss\Louvers & Dampers\21 [Combination Fire-Smoke Dampers]\02 [3 Hour Rated]\02 [MT2]\thumb_LD - MT2.png)
Model: MT2
Frame Type: 5-1/2" x 16ga w/ Single Thickness Blade
Material: Galvanized Steel
Temperature Rating: 250°/350°
Max Velocity: 2000 fpm @
4 in wg
Max Horizontal Panel Size: 30" x 48"
Max Vertical Panel Size: 36" x 48"
![](/tools\uss\Louvers & Dampers\21 [Combination Fire-Smoke Dampers]\01 [1.5 Hour Rated]\01 [RM]\thumb_LD - RM.png)
Model: RM
Frame Type: 16" x 20ga w/ True Round Blade
Material: Galvanized Steel
Temperature Rating: 250°/350°
Max Velocity: 2000 fpm @
4 in wg
Max Horizontal Panel Size: 24" dia.
Max Vertical Panel Size: 24" dia.