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.

Acoustiblok is a company that has been providing engineered sound proofing solutions to customers around the world. Our trained staff gives free consultations on various noise pollution that occur industrial, commercial, residential & transportation apps.