Gel-Seal HEPA Filter

A gasket seals by compression, so uneven clamping or a slightly deformed frame leaves a bypass path, and the gasket takes a permanent set after a few changeouts, losing sealing force. Gel sealing works by pressing a knife edge into a filled channel, which tolerates far more frame irregularity and does not degrade with repeated changeouts. The deciding factor is cleanliness class: at ISO Class 5 and above — or wherever PAO scan testing is judged strictly — bypass leakage is usually what fails the test, and the rework a gel seal avoids costs far more than the price difference. For general ventilation or ISO Class 7 and below, a gasket is sufficient.

No. "Non-condensing" is the binding constraint: the filter can run indefinitely in air at near-saturation relative humidity, but it is not rated once that moisture condenses into liquid water on the media. The reason is that a water film blocks the pores and drives pressure drop up sharply, and wet glass fiber loses structural strength — in bad cases the media collapses and opens a breach. In practice, avoid locations where temperature drops abruptly: outdoor air hitting a cold surface, or a housing cooling down after shutdown. If condensation cannot be avoided at the installation point, add upstream dehumidification or pre-heating rather than expecting the filter to absorb it.