I've been working on my aeration plans and I've tried to come up with a way to build an inline HEPA filter. I just happened to ask our Materiels manager about it and VOILA, we stock such and item.
This is used in the OR, comes with 10ft of PVC tubing and best of all it has an inline ULPA filter which is actually better than HEPA.
HEPA = 99.97%
ULPA = 99.999%
And best of all, I can buy these for $7.79.
Just some more FYI:
From: http://www.ristenbatt.com/filt_eff.mv
HEPA and ULPA Filtration Specifications
HEPA (High Efficiency Particulate Air) is a filtering efficiency specification for filters developed by the Atomic Energy Commission during World War II to effectively remove radioactive dust from plant exhausts without redistribution. A HEPA filter must retain all particles as small as 0.3 µm in size with an efficiency rating of 99.97%. The phrases "as small as" or "at" mean that if all particles were that small, it would still have that efficiency. This should not be confused with the phrase "down to" which may mean a mixture of particle sizes for the stated efficiency.
The HEPA acronym is used primarilly in the USA whereas Europeans often refer to the same filter as an S-Class filter. This indicates that the filter meets standards like the British Standard 5415 and German norm: DIN 2418B Ti-E EU 13 for filtration performance. Please see "Can HEPA or S-Class Filtered Household Vacuums Safely Retain Anthrax?" for an answer to this important question.
ULPA (Ultra Low Penetration Air) is a filtering efficiency specification for filters used in environments like pharmaceutical labs wherein the highest degree of clean air must be maintained. An ULPA filter must retain all particles to 0.12 µm in size at an efficiency rating of 99.999%. The Nilfisk GM 80 Portable Dust Collector is an example of a commercial vacuum cleaner which can be equipped with a Certified ULPA filter. Due to its air tight seals, it actually meets the ULPA specification for net filtration.
Certified HEPA and ULPA filters are tested and marked with a certification number which gives the user the assurance that the stated specification is actually being achived by the filter. It is very important to have a completely sealed system so all air flow must pass through the HEPA or ULPA filter to be cleaned by it.
