Use and Care Manual

9
FREQUENTLY ASKED QUESTIONS
Please review these frequently asked questions on the next two pages prior to using your air purifier.
Q. What exactly is a HEPA filter?
A. The HEPA (High Efficiency Particle Arresting) filter was developed by the US Atomic Energy Commission
to filter out sub-micron particles. All True Medical HEPA is laser-tested and must remove a minimum of
99.97% of all particulate matter greater than 0.3 microns in size. A human hair is about 300 times too
large to penetrate a HEPA filter.
Q. What is a HEGA filter and what does it do?
A. HEGA is unique and stands for High Efficiency Gas Absorption. A HEGA air cleaner combines a HEPA
filtration system with an added military carbon cloth filter medium to effectively eliminate over 3,000
gases and odors from the air.
Q. What is the CFM rate?
A. The CFM (Cubic Feet per Minute) is the measurement of how much air passes through the unit. For the
Medical Grade Air Purifier XL the fan CFM is 400 cfm on high and 75cfm on low. The Medical Grade Air
Purifier is 200 cfm on high and 50cfm on low.
Q. How many filters are inside the Medical Grade Air Purifier and Purifier XL?
A. There are four filters. The first filter is a pre-filter (known as Permafilt) which is a cotton cloth that lines
the inside wall of the unit. The purpose of the pre-filter is to stop hair or large dust particles from clogging
the HEPA filter. The second filter is a medium particle pre-filter that filters our medium size particles.
The main filter is comprised of two filters, a True Medical HEPA filter and the military carbon cloth filter
known as HEGA.
Q. What is activated carbon?
A. Activated carbon is effective at removing gas molecules and odors. Activated carbon is the most
common element in military gas masks. The most common method of activating carbon is a two-stage
steaming process, which enlarges the carbon’s surface pore size. This in turn produces a more accessible
internal surface area allowing for greater odor and gas adsorption.
Q. Where should I place the unit for maximum effectiveness?
A. It can be placed anywhere in a room, including corners, but must be at least four (4) inches from the
wall to give consistent effective results. The air cleaner should be placed in the bedroom at night with
the door closed in order to produce the best personal results. The best room in the house to use a single
machine is the bedroom.
Q. Is the air cleaner noisy to operate?
A. Depending on the fan setting used, the noise level ranges from less than 50 and up to 67 decibels, or
from the sound of a whisper to the sound of a normal conversation.