The walls of the internal airway through which dirty air passes are made of a pleated fabric which traps particles as they are flung out of the airstream. The result is a high rate of removal of even the smallest particles, with no filters to obstruct the flow of air. In an average 2500 sq. ft. home, all the air passes through the furnace 4.5 times every hour. With a Lifebreath TFP in a by-pass configuration, drawing off 10% of the air continuously, 45% of the air will be cleaned every hour. Depending on the condition of the home, all the air will pass through 10 times every 24 hours! The Lifebreath Air Cleaner works with all central air heating/cooling systems.