MERV Ratings and More

An excellent article appeared on EnergyVanguard dealing with the unintended consequences of the current drive to shift to MERV 13 filters in HVAC systems. The bottom line is a long list of potential side effects of simply upgrading your filters to MERV13 in a system that was not designed for it.

The whole problem is that within the legacy model of air filtration as you go up the scale from let’s say MERV6 to MERV13, you are greatly increasing the amount of energy needed to overcome the resistance of the filter and that translates to higher energy bills, more wear and tear, and so on. As the referenced article shows, the best you can more or less hope for with MERV13 filtration is 85% reduction of fine dust, which is the most dangerous air quality problem indoors. At that, it requires a wind speed equivalent of some 15-20 MPH, merely to overcome theincreased resistance from the MERV13 filter media.

The above is the reason why, the Dexwet Pure Air filter we are introducing currently, provides a radically better solution, because it is not based on a sieve, with the finer and finer holes, causing more and more air resistance, but instead on a rigid grid of perforated tubes that are coated with an absorber fluid with extremely low surface tension, and the design relies on the vander Waal’s principle to allow the fine dust to settle and get absorbed in the liquid with each time the air passes through the filter, with negligible air-resistance. The end result, in conditions with adequate air exchange, the filter could achieve a 99% reduction in PM1, PM 2.5, and PM10 within about half a day.

There is another nastier secret. Sieve type filters meet their performance spec exactly once and then begin to deteriorate, as they load up with dust. So after about 1/3 of the site-specific service life, they will start to deteriorate steadily, requiring more and more energy, and eventually, they may begin to shed dust again as air pressure increases and they release dust particles that were previously trapped. Dexwet instead absorbs the dust completely in the absorber fluid and as a result the surface area of the liquid increases over time, until nearly the end of the service interval for the filter, at which point it needs to be cleaned and the absorber fluid re-applied, but there are no filters to be thrown out.

The upshot is, Dexwet Pure Air gives you better Indoor Air Quality, with less energy, less wear and tear, less maintenance, whereas with legacy methods, improving the IAQ always means more energy consumption, more wear and tear and more waste.

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