The Multi-Purpose, Multi-Tasking, PAS HEPA System

Since 1985 when Pure Air Systems first came out with its fan powered, commercial grade HEPA filtration unit, the systems have been used for all types of air quality problems and co-joined with other equipment proving its all around capabilities. Because the PAS HEPA systems use highly efficient yet powerful fan motors these units are like WD40, they work on everything.

When you think about an air filtration unit, especially a HEPA based unit, you automatically think the system is used strictly as a filtration device. While that may be true for the majority of HEPA filtration units, the PAS systems can be used as a small air handler, pressurization unit, stand-alone mobile unit, in conjunction with any HVAC unit, and as an all Carbon unit.

The PAS line of fan powered HEPA and Carbon based systems were originally designed to be installed on the return air side of any forced air ducted heating/cooling system. In this capacity they can clean all the air in a house or office area up to 48 times per day.  They can even introduce small amounts of outside filtered fresh air through the unit to assist in pressurizing the environment and reducing the levels of CO2 in heavily occupied facilities.

In applications where a small amount of heating or cooling (1 to 2 ton capacity) is required, the larger, more powerful PAS HEPA systems can be mated with a cooling coil or electric heating element so that the system will move the heated or cooled HEPA filtered air through a small area and provide comfort control with filtration all in one unit.

The PAS HEPA Systems can be used in any medical, electronic assembly or critical high tech environment to both filter the air to meet the clean room requirements as well as pressurize the room to minimize any in-leakage of outside air. In addition, the unique variable speed dual voltage digitally controlled motors used in the PAS unit allow for finite air volume control to maintain proper air flow and pressurization when needed.

The ECM variable speed motors are rated 120/240 volt, 50/60 Hz and will operate anywhere in the world. This means remote areas when a HEPA filtration type of system is required can be accomplished using the PAS HEPA filtration systems. The units can also be installed in mobile trailers or wheeled mobile units like ambulances, mobile labs, mobile medical units and mobile HAZMAT units.

When an application calls for removal or reduction of a specific odor or gas, the PAS HEPA units can be easily converted to all Carbon units to effectively handle the gaseous problem. This conversion can even be accomplished in the field.

For more information on the complete line of PAS HEPA and Carbon filtration systems as well as customer references and installation information please go to our website at:

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Even With Great Air Filters HVAC Maintenance A Must

Most home owners have a minimal amount of knowledge about heating/cooling systems, but one thing they do know is that the unit requires an air filter. Some home owners have enough experience  to know that not changing the air filter can create problems for their air handler efficiency. Those that have severe allergies, asthma or other respiratory issues usually have significant knowledge about air filters and their efficiencies.

Over the past twenty years air filter technology and air filter materials have been significantly improved; especially those filters designed for the residential markets. Many of the newer air filters fit tighter, have more dust holding capacity and lower pressure drops or resistance. This usually means less dust in the house and less dirt and dust accumulating on the air handlers fan and cooling coil components.

As a result, many home owners often believe that general maintenance on the air handler fan and coil sections can be limited to only once every one to two years. This is certainly not true. Even with the best air filtration systems the cooling coils and air handler fan will eventually get dirty. And, keeping the cooling coils clean is important for  cooling or air conditioning efficiency.

During the year as the HVAC system shifts from heating to cooling and back again,  small amounts of moisture will develop in the duct work and small, sub-micron particles will attach to this water vapor and be deposited on the cooling coils and air handler fan blades. If this material is not removed from these surfaces it can actually cause the fan blade to get out of balance and create bearing problems or put enough of a dust coating on the cooling coils and you will reduce the efficiency of your cooling system and provide a home for mold to grow.

Most heating/cooling contractors offer a maintenance program that includes “tune ups” in both the heating and cooling seasons. If you run your systems 8 to 12 months out of the year, then you should have your HVAC system serviced at least once a year or during both seasons. In addition, you should be changing your air filter at least four times a year or once every three months. This ensures the least amount of dirt build up on the air handler components between servicing.

Pure Air Systems has been providing HEPA, Carbon and air filter media systems for the residential and commercial markets since 1985. Using a commercial grade HEPA system or one of their BioPanel air media filters in your HVAC unit will reduce the level of harmful airborne particulate while maintaining a much cleaner heating/cooling system.

For more information on Pure Air Systems and their complete line of air filtration products please go to our website at:

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