How does a Central Vacuum Work
Ironically, the most common tool for removal of dust, the standard portable vacuum cleaner, actually makes air worse.

For one thing, their filters are designed to protect the vacuum motor from fine visible dust, not the humans from harmful, invisible dust.

Standard vacuums remove mostly visible dirt, so that our homes look clean. The reality is vacuums lift smaller, harmful particles up from the floor, and blow them into the indoor air where they are breathed. The vacuum bag cannot stop fine, mostly invisible dust. The portable vacuum captures and removes large, visible dirt particles. But particles too small to be seen; blow right through the filter or bag, and back into the home, over and over again. There are far more small, invisible particles, than there are large, visible ones.

The agitation and air flow created by your vacuum causes a huge number of minute dust mite dropping to be drawn into it. They can easily pass through most vacuum cleaner bags and filters and be exhausted back into the air you breathe, making it much dirtier than before.

Our bodies have protective measures against some particles in the air; nose hairs, mucous in the nose and throat, and the hair like cilia in the upper lungs. But most particles in indoor air, those under .3 microns in size, get past our bodies' defenses, right to the gas/blood exchange region of the lung, and enter our bloodstream where they can cause allergic reactions.

The effect of typical vacuums compounds over time. Each time you vacuum, you pick up the new dirt in your home, remove the few larger particles that are captured in the vacuum filter or bag, and release most of the fine, invisible dirt back into the indoor air of your home. Plus you pick up the fine invisible dust released from past vacuuming and release it back into the air again..

So each time you vacuum with a portable unit, you add to the buildup of allergens in the air in your home.

As a solution to this problem, the central vacuum cleaner becomes one of the most important tools for managing household allergens like dust mites and their minute droppings. Thorough cleaning of carpets, mattresses, upholstered furniture, curtains and drapery regularly will reduce the dust mite allergens in your home. It is better to clean thoroughly once a week instead of lightly every day. In order to prevent these minute particles containing allergens from being re-circulated into the air you breathe, a central vacuum cleaner must be vented outside the home.

To reduce the effects on allergies and asthma caused by the allergens in dust mite droppings, look for a central vacuum cleaner that vents to the outside of your home. It also is very important to have a completely sealed system so all air flow must bypass the motor through the fan blades to be vented outdoors.
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