STI leads the industry in developing innovative fire protection systems that help stop the spread of fire, smoke and hot gases. For over 25 years, our team has worked hand in hand with the construction industry to create simple solutions to complex firest

Airflow Direction Incorporated’s BALL-IN-THE WALL & BAULIN-TUBE® indicator shows if your room is under proper negative or positive pressure. The ball rolls in the direction of airflow and incorporates a built-in failsafe feature...