OLS Fire dampers are passive fire protection products used in ventilation and air conditioning (ACMV) ducts to prevent the spread of fire through fire-rated walls and floors.

OLS curtain blade fire dampers were subjected to rigorous independent laboratory testing to relevant Australian Standards, British Standard BS476 Part 20, and Part 22, and Singapore Standards SS333. The fire dampers were tested to 4-hour fire resistance in single and multiple-module construction on the wall, floor, and drywall.

Our fire dampers are constructed of heavy gauge galvanized steel and with the option of construction in stainless steel material. Each model of fire damper may be fabricated in 3 variations:

Type A: Curtain blade within the air stream. For use with low-velocity airflow,

Type B: Curtain blade out of airstream for use with low to medium velocity airflow,

Type C: Curtain blade and damper frame entirely out of air stream. This damper offers 100 percent free area to airflow, minimizes pressure drop, and is ideal for medium to the high-velocity system.