Frequently Asked Questions
Q: Are the benefits of HEPA filtration recognized by the scientific and healthcare communities?
A: Numerous CAP units have been purchased as a direct result of physician recommendations. According to the 1997 ALA publication, “Blueprint for Heather”, ‘Because of its high efficiency at filtering out tiny particulates, HEPA filtration is highly recommended for those individuals who suffer from allergies, asthma, or other respiratory problems.’
Q: I’ve heard Advertisements on the radio for allergy filters for under $100. Why would I buy a CAP HEPA system?
A: You get “what you pay for.” These ads are generally for 1” thick “passive” filters with an electrostatic charged media. When clean, this type of filter typically catches less than 20% of 0.3 micron particles. When dirty, almost all the particles can pass right through. HEPA filters start at 99.97% and actually get more effective as filters become dirty.
Q: Are “HEPA type” filters the same as true HEPA filters?
A: No. By definition, “true HEPA” filters can allow no more the 3 out of 10,000 0.3-micron particles to pass through. “HEPA type” filters may allow leakage of as many as 4,500 for 10,000 0.3-micron particles.
Q: How do I know when I need to change the CAP filters and lamps?
A: To keep the system running at peak efficiency, the furnace blower and the CAP unit must be run in the continuous mode. Pre filters should be changed when the amber “change filters” lamp illuminates; UV and UV Plus lamps should be changed yearly; HEPA filters about every two to three years.
