HEPA H13 CBRN Air Filtration Installation in Butte, Montana

Common Challenges

• Contaminated air seeps through cracks without positive pressure

  Bunkers without overpressure blowers allow airborne contaminants to infiltrate through door seals, pipe penetrations, and structural cracks during chemical or nuclear events.

• HEPA filters clog fast in high-particle environments

  Fallout events generate massive airborne particle loads that overwhelm undersized filter banks, forcing filter changes during contamination when it's least safe.

• Mining-affected terrain creates subsurface air pathways

  Historic mine shafts and tunnels in Butte's mining-affected terrain can channel contaminated air underground, bypassing surface-level filtration if intake placement isn't carefully engineered.

How We Help

• HEPA H13 filters capture 99.97% of 0.3-micron particles

  Filter banks with HEPA H13 media remove radioactive dust, biological agents, and chemical particulates to NBC system specifications, tested for airflow and pressure drop before handoff.

• Activated carbon banks remove chemical vapors and gases

  Multi-stage carbon filtration with impregnated media removes nerve agents, industrial chemicals, and toxic gases that pass through HEPA filters.

• Overpressure blowers maintain 0.5 inches water column positive pressure

  Variable-speed blowers keep bunker pressure above outside air, preventing contaminated air infiltration through cracks or seals even during door operation.

• Filter change protocols allow safe replacement during events

  Bag-in/bag-out filter housings and pre-filter stages let you swap contaminated filters without exposure, extending system runtime during extended contamination.

• Intake placement engineered for Butte's mining terrain

  Air intakes positioned to avoid subsurface contamination pathways from historic mine shafts, with pre-filters sized for heavy snow and particulate loads.

• HEPA H13 filters capture 99.97% of 0.3-micron particles

  Filter banks with HEPA H13 media remove radioactive dust, biological agents, and chemical particulates to NBC system specifications, tested for airflow and pressure drop before handoff.

• Activated carbon banks remove chemical vapors and gases

  Multi-stage carbon filtration with impregnated media removes nerve agents, industrial chemicals, and toxic gases that pass through HEPA filters.

• Overpressure blowers maintain 0.5 inches water column positive pressure

  Variable-speed blowers keep bunker pressure above outside air, preventing contaminated air infiltration through cracks or seals even during door operation.

• Filter change protocols allow safe replacement during events

  Bag-in/bag-out filter housings and pre-filter stages let you swap contaminated filters without exposure, extending system runtime during extended contamination.

• Intake placement engineered for Butte's mining terrain

  Air intakes positioned to avoid subsurface contamination pathways from historic mine shafts, with pre-filters sized for heavy snow and particulate loads.