Designed for processes that produce hazardous dusts in high concentrations, 49 x 42 x 87 in. Quad Pulse Package PX can be constructed to provide explosion protection in accordance with NFPA standards and located indoors without requiring additional explosion safety devices. Unit requires single primary filter cartridge due to segmented cleaning process. While primary pleated filter comes in conductive nano fiber or PTFE media, second-stage HEPA H14 filter provides 99.995% efficiency.