How does a HEPA filter work on a vacuum?
article continues below ↓ A: A vacuum cleaner draws air in through the cleaning tool. That air carries dust with it. Most vacuum cleaners have a bag that allows the air to pass through the paper walls of the bag but traps the dust, just the way a coffee filter keeps the grounds but lets the water through. Unfortunately, some of the dust particles, particularly those carrying allergens, can pass through the microscopic pores in the paper bag. After the air carrying allergen particles passes through the bag, it passes through the blower and is emitted into the room. A HEPA vacuum has another highly efficient filter after the blower. This filter allows the air from the blower to pass through but traps the microscopic allergen particles that escaped the bag. The most important features in a HEPA vacuum are the HEPA filter itself and how it is held in place. The filter itself should be made of a pleated, semi-rigid material held in a frame. The frame must be held tightly in place by an airt
