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About other Duct Cleaning Equipment: Tips 
Hepa Vacuum Being stationary, the units usually have larger and more powerful motors than those that can be used in the portable vacuuming cleaned devices. 
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Milibar (mbar) A unit of measurement typically used in the USA to report atmospheric pressure. A special 30' long hose allows the user to conveniently reach into every part of the house to effectively clean it. Polycarbonate An extremely tough and strong synthetic plastic with the ability to maintain its shape and size even under great stresses over a wide range of temperatures. 546 to get inches of water lift.
Lexan Lexan is GE's registered trademark for a particular polycarbonate resin. 546, you then need to multiply the inches of mercury by 13. It is based on suction with flow as measured at the vacuumed and cleaned inlet. Please see also "Can or S-Class Filtered Household Vacuums Safely Retain Anthrax?" for an answer to this important question.
Opposition to flow is even present within the suction motor and vacuumed and cleaned case since the makes a number of sharp turns as it passes through them. Flow The movement of from one location to another. Micron A unit of measure equal to 1/1,000,000 meter (about 1/25,000 inch). It is one of the most important aspects of vacuumed and cleaned performance.
Electrostatic Filter A type of filter media consisting of very fine synthetic fibers on which a static electric charge builds as passes through them. While usually not producing as much suction for use with attachments, this design often will produce more flow when working with large openings and short flow distances. Bakelite Bakelite is an important thermosetting resin made from phenol and formaldehyde which can be injection molded to make parts which are resistant to heat, chemicals and moisture. For examples of excellent, see our list of Ristenbatt Vacuum's Preferred Models.
The effect of this is to help work the dirt and grit toward the top of the carpet. See also Flow. The most common use has to do with the ability of a vacuumed and cleaned to pick up dirt from the surface being cleaned. The main flow, which picks up the dirt, travels through the suction fan or fans but bypasses the motor itself.
Beater Bar A long rigid bar or raised area on a revolving brush roll which pushes the carpet away from the roll, creating a rapid beating action. Typically incorporating a "clean-", they are known for producing strong suction for use with the attachments. Stiff bristles on a brush roll can have a similar effect. One ampere of current will flow through a conductor having one ohm of resistance when a potential of one volt is applied to it.
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