Ninety-nine percent of what’s floating in your home’s air is invisible to the naked eye. But you and your family know it's there, especially if you’re sensitive to allergens, bio-organic contaminants or chemical pollutants. Whole-house HEPA filtration removes 99.7 percent of airborne particulates from your environment, far exceeding the threshold of standard consumer-grade HVAC filters generally installed in heating and cooling systems.
The right recommendation
High efficiency particulate air (HEPA) filtration is the technology recommended by doctors and utilized in hospitals and health-care facilities.The Environmental Protection Agency reports that indoor pollution can be many times more concentrated than outdoor levels, particularly in well-sealed, energy-efficient homes. So what you don’t see in your air is increasingly important to the health and comfort of your family.
The HEPA solution
The MERV (Minimum Efficiency Rating Value) rating for standard filters generally installed in a heating and cooling system normally ranges from 5 to 8. Filters with higher MERV ratings are available, but they can restrict airflow, starving the system of air. Whole-house HEPA filtration units offer MERV ratings as high as 20 and remove particles down to 0.3 micron size—cleansing your air of pet dander, pollen, bacteria and mold spores—without restricting airflow.
How HEPA works
Whole-house HEPA systems connect to the return duct in your HVAC equipment, incorporating a blower to draw up to 60 percent of the air out of the duct and into a bypass loop. The air passes through the external HEPA filter array, then is looped back into the return duct—without restricting return airflow. At a typical rate of air change, your home’s entire air quantity will pass through HEPA filtration up to 48 times every 24 hours.
The HEPA filtration system is generally comprised of three separate filters: A standard polyester pre-filter to remove large, inorganic dust particulates; a carbon air filter to extract chemical fumes and odors; and the final HEPA-grade filter.
Whole-house HEPA systems can operate independently of your HVAC system. In “continuous” mode, the HEPA system will circulate air through the ducts and filter array utilizing its blower, maintaining healthy indoor air—even when the furnace and A/C are turned off.
Paul Wadsworth is the President and Owner of P.K. Wadsworth Heating and Cooling. For 37 years, Paul has been providing heating and cooling services to the Greater Cleveland area. P.K. Wadsworth has been a trusted Cleveland HVAC service company for 75 years. The company understand the area's construction and local heating and air conditioning needs. Paul has an MBA from the University of Michigan and a B.S., Industrial Engineering from Purdue University. He's been President of the Cleveland Air Conditioning Contractors of America and a founding member of the local chapter. Paul was born and raised in Cleveland and has been active in the local community. He resides in Cleveland, Ohio with his wife and two sons.
The opinions and statements contained in this article are for general informational purposes only and are not instructions. Only trained, licensed and experienced personnel should attempt installation/repair. The author assumes no liability for the opinions/statements made in this article. Any individual attempting a repair or installation based on this article does so at their own risk of loss.