The HEPA Filter

The nuclear grade HEPA filter is a special filter we have made just for our application. Each HEPA filter is individually tested to MIL-STD-282 before it leaves the factory, your assurance that it meets rated efficiency. The penetration and actual airflow rate are indicated on the label. Each filter is also assigned an individual serial number.

Testing – each filter is individually test by two methods:

PAO Test
This has been the industry standard for many years. It is conducted
using a forward light scattering photometer. The filter is challenged
with poly-alpha-olefin (PAO). By measuring the upstream and
downstream concentration, the filter efficiency can be calculated.

Laser Test
The filter is tested with a laser spectrometer using polystyrene
latex (PSL) spheres. Filter efficiency is determined by comparing
the upstream and downstream concentrations. Efficiencies down to
0.10 micrometers can be determined.

Underwriters Laboratories Classification UL 586: This classification to insure that each HEPA filter cell is individually tested at the factory. Additionally, representative HEPA filter cells are tested by UL to ensure that they provide their rated HEPA level filtration, after being subjected to the following conditions of a high moisture environment of (90% R.H.), a high temperature environment of (371 deg/C), low temperature environment of (-3 deg/C). UL also subjects the HEPA filter cell to a spot flame test of (954 deg/C).

• Media: Water repellent glass micro fiber 99.97% True HEPA cell type (A)
• Cell Side Material: Fire retardant particle board
• Separators: Aluminum
• Bond: Polyurethane foam
• Gasket Material: Neoprene (RE43E1)
• Gasket Location: Both sides
• Factory Test: Certified 99.97% (DOP)
• UL 866 Label: Required