Not true fjld! The higher quality HEPA air cleaners have HEPA filters
and pre-filters that last a very long time before they need to be
replaced. This is because the filters are larger as they should be and
they have a much higher air exchange rate per hour to do a much better
job then the small low quality air cleaners and air purifiers you will
find in most department stores. The small air cleaners require the
filters be changed out more often because their surface area is too
small to collect enough dust and allergens. It really does pay to spend
a bit more money for a higher quality air cleaner that will do a much
better job for much less money spent in filter replacement cost. You
really can have much better indoor air quality and you will find the
best HEPA air cleaners and HEPA air purifiers at the lowest prices at
http://www.aircleaners.com