| RM |
 |
Class I, 250°F, 1½ hour Single Thickness Blade,
True Round Fire/Smoke Damper
|
| MR1 |
 |
Class I, 250°F / 350°F, 1½ hour Single Thickness Blade,
Fire/Smoke Damper
|
| MR2 |
|
Class II, 250°F / 350°F, 1½ hour Single Thickness Blade,
Fire/Smoke Damper
|
| MS1 |
|
Class I, 250°F / 350°F, 1½ hour Fire Resistance Rating |
| MS1(SS) |
|
Stainless Steel, Class I, 250°F / 350°F, 1½ hour Fire Resistance Rating |
| MS2 |
|
Class II, 250°F / 350°F, 1½ hour Fire Resistance Rating |
| MS2(SS) |
|
Stainless Steel, Class II, 250°F / 350°F, 1½ hour Fire Resistance Rating |
| MA1 |
|
Class I, 250°F / 350°F, 1½ hour Fire Resistance Rating, Airfoil Blade |
| MA2 |
|
Class II, 250°F / 350°F, 1½ hour Fire Resistance Rating, Airfoil Blade |
| MS1G / MS2G |
|
Class I/Class II, 250°F / 350°F, 1½ hour Fire Resistance Rating, Front Access Damper for Grille Installation |
| MT1 |
|
Class I, 250°F / 350°F, 3 hour Fire Resistance Rating |
| MT2 |
|
Class II, 250°F / 350°F, 3 hour Fire Resistance Rating |
| LA1 |
|
Class I, 250°F / 350°F, 3 hour Fire Resistance Rating, Airfoil Blade |
| LA2 |
|
Class II, 250°F / 350°F, 3 hour Fire Resistance Rating, Airfoil Blade |
| EHRD |
|
Electric Heat Response Device |
| PHRD |
|
Pneumatic Heat Response Device |
| ESOT |
|
Electric Sensotherm |
| PSOT |
|
Pneumatic Sensotherm |
| IDPI |
|
Integral Dual Position Indication |
| SLVFS |
|
Sleeves |
| TRFS |
|
Transitions |
