Designed with input from some of the world's largest consumers of upright vacuums, the CV series are truly in a class by themselves. Uncompromising TRUE HEPA filtration is present in the high efficiency three stage filter system. The units come standard with this demanding level of filtration and were designed specifically to meet or exceed most worldwide indoor air quality standards. The CV 30 and 38 has incorporated the best ideas the industry has to offer and then improved upon them. All CV's come standard with soft rubber bumpers, on board tools, a protected hose and cord assembly, a simple to use height adjustment and specially engineered shock absorbing wheels.
Monday, December 26, 2011
Friday, December 9, 2011
Static Electricity and How to Avoid It
Have you ever felt almost afraid to touch a metal door knob, counter, or similar surface for fear of that little annoying zap you might get upon contact? Well, that's static electricity for you my friend, and you're not alone in not looking forward to its shenanigans. Before you can effectively take steps toward lessening its effects in your life, you must first learn what static electricity is and how it is created.
Everything in the world is made up of atoms, and each of these atoms are made up of a combination of sub-atomic particles - protons, neutrons, and electrons. The protons and neutrons form what is called the nucleus, or the core of the atom, and the electrons can be thought of to orbit this core. Protons have a positive electric charge and electrons have a negative one.
For our purposes, you can think of the nucleus - the protons and neutrons - to be stable, whereas the electrons are often less so and tend to be easily "knocked out" of orbit and transferred to other atoms. This process is called ionization, where an atom's proton-electron ratio is altered via the removal or addition of electrons.
Most atoms in their natural state are neutral, having no net electrical charge. But when they become ionized, depending on whether they lost or received electrons, they will either have a net positive or negative charge respectively. This is a true case of "opposites attract", where atoms that are charged will attract the opposite sign - positive to negative and negative to positive.
The opposite is true as well - like charges will repel one another. This explains why a balloon will momentarily stick to a wall after you rub it against your clothes - because you just added additional electrons to the balloon and gave it a net negative charge causing it to be attracted to the (comparatively) positively charged wall.
So what do atoms have to do with static electricity and people?
Well, our bodies are made up of atoms the number of which is so huge it's usually written using scientific notation: 7×10^27 atoms. That's 7 followed by 27 zeros - 7,000,000,000,000,000,000,000,000,000! A pretty insane number. And like I mentioned above, most atoms have a neutral charge, including aaaall those lovely atoms that make up our bodies.
So when we walk across a carpeted floor or our clothes rub against our skin, our bodies accumulate an electric charge via the transfer of electrons from these various materials. This net electric charge will then look for a way to discharge itself the next chance it gets. This is right about the time you reach for the stainless steel door knob and feel that less-than-wonderful sensation.
In terms of electricity, there are two general kinds of materials - insulative and conductive. Insulative materials are those like rubber and wood that inhibit the flow of electrons whereas conductive materials are those like most metals, water, and any highly saturated mediums - even humid air. This is why static electricity is more common in drier winter months.
In order to understand this better we need to see why this usually doesn't happen in summer or wetter months and climates. The wetter air surrounding our bodies is conductive to a certain extent, discharging any buildup of electrical charge before accumulating too much. Conversely, dry air acts as an insulation which doesn't allow this discharge. This explains why this may happen in air-conditioned spaces even when it may be humid outside.
Tips to Avoid Static Electric Shocks
Now that we understand how static electricity works, it'll be easier to understand how to avoid it. The primary reason for the buildup in the first place is because you weren't grounded and therefore accumulated the electric charge due to the absence of an exit path. There are several ways you can either minimize these shocks significantly, or at the least, make it so they're not as painful.
Open a window or two. Remember that humidity in the air causes higher electrical conductivity, therefore introducing humidity to a dry atmosphere can help. Use hand moisturizer regularly. By keeping the parts of your body most prone to shock moisturized, you can prevent excessive buildup. Wear leather shoes. Although leather isn't a conductor per se, it isn't nearly as good an insulator as rubber and is therefore better equipped to discharge a buildup. Use an antistatic wrist band. These are often used by those handling sensitive computer chips and similar parts that can be severely damaged by even small amounts of static electricity. When all else fails, try rapping your calloused - or at the least, tougher - knuckles against the surface in question to discharge any buildup prior to touching it with your more sensitive finger tips.
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Friday, December 2, 2011
HEPA Air Purifiers and Filters
HEPA Air Purifiers
Isn’t it a bit confusing reading about all the different types of air-purifiers that are available in the market today? If you were to do a search on the Internet for air-purifiers you will be presented with literally thousands of websites, all of which sell a variety of air purification machines. One of the most popular air-purification systems is a HEPA air purifier.
HEPA Filters
An acronym for ‘high efficiency particulate arresting’, a HEPA filter theoretically is capable of removing almost 99.97 % of airborne particles of .3 micrometers or larger. These would include common irritants and allergens like dust, pollen, mold and bacteria. The original HEPA filter was designed in the 1940’s during the Manhattan Project by the US Atomic Commission to prevent the spread of airborne radioactive contaminants which were a result of atomic bomb testing. These were made commercially available in the 1950’s and HEPA became the registered trademark and a generic name for highly efficient filters. Over the years HEPA filters have been further developed to satisfy a greater demand for air purity not only in homes but also in various industries like aerospace, electronic micro circuitry, biopharmaceutical labs, and in office and commercial complexes. There are also Ultra-HEPA or ULPA filters available whose ability to filter dust and other contaminants is even better than HEPA filters. It filters out 99.99% of the contaminants.
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True HEPA filters, are excellent for removing all types of contaminants that are greater than .3 microns in size. One micron is approximately one hundredth times smaller than the width of your hair. So, you can visualize just how tiny .3 micron is and the capability of this filter to be able to trap and remove such particles. Thus when buying a HEPA filter do ensure that you’re buying a true HEPA filter and not a HEPA type filter as the efficiency of the latter ranges from 25-95%, while true HEPA filter is 99.97% efficient in removing airborne particles.
In addition, HEPA filters provide a dry environment, ensuring the complete elimination of the trapped bacteria as it cannot survive in dry conditions. Some filters are chemically treated to kill bacteria while others may include a germicidal ultra violet light to achieve the same effect.
HEPA Air Purifiers are noisier than other filters because they use a motorized fan to suck in the air. However, when purchasing the purifier one must note the performance of the fan motor as a weak motor will not be able to draw in satisfactory amount of air for the purifier to be effective. The filter usually needs to be replaced every 12-18 months, depending on the usage of the purifier. The life span of a HEPA filter usually ranges from two to five years.
By and large HEPA air purifiers are rated the best in terms of overall performance and ability to filter out microscopic particles.
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