Products
Filter Housings
Air Filter Housings
  • Versatile line of Air Filter Housings designed for easy installation into original equipment and retrofit filtration systems.
  • Standard housings are constructed of 16 gauge steel and can be manufactured to meet specifications in ASHRAE or HEPA applications.
  • A wide variety of optional features and housing depths.


Single-Stage Side Access Housing

Housings to fit either 2” or 4” filters are available.

The Single-Stage Side Access Housings are ideal for new construction or renovation projects.
All units are constructed of 16 gauge galvanized steel.
Housings are also available in stainless steel, aluminized steel and epoxy coating.

All Single-Stage Side Access Housing units are supplied with two access doors, hinged at the rear of the housing for easy access to the filters.
Each door is gasketed around the perimeter and at the ends of the tracks to prevent air bypass around the installed air filters.
Quick action, positive lockover-center draw latches are used to seal the doors.

Single-Stage housings are equipped with up-stream and down-stream outer flanges for easy connection to ductwork.

Dual-Stage Side Access Housing

Dual stage housing units can be equipped to accommodate 2" or 4" nominal prefilters and final filters with a nominal 1" header.
Housings come standard with two access doors and outer flanges for easy connection to ductwork.


Koch Filter offers a fully assembled Dual-Stage Side Access Housing available in a wide range of sizes and depths.

Dual-State Housing features:

  • Gasketed doors and pre-filter and final filter tracks to accommodate a wide selection of Koch filter options
  • Rugged 16 gauge galvanized construction


  • Units are corrosion resistant and are available in a wide range of options including galvanized, aluminized, and stainless steel.

    Multi-Stage Carbon Filter Housing

    Units available in multiple absorbents: Activated Carbon, Potassium Permanganate and 50/50 blend

    The Koch Multi-Stage Carbon Filter Housing is factory constructed as a durable one piece assembly for side access installation.

    The unit is designed to accommodate 2" or 4" nominal prefilters and 1" nominal carbon trays.

    The Koch Filter carbon housing is rated at 500 FPM operation, containing 90 pounds of carbon per 2000 CFM.
    The trays are 24x24x1 or 12x24x1 with a black powder coated finish.
    Trays are refillable.

    The Multi-Stage Carbon Housing is available in a wide range of options including galvanized, aluminized, and stainless steel.

    BioMAX HEPA-Lock Housing

    BioMAX HEPA-Lock Housing units can be equipped to accommodate 2" or 4" nominal prefilters.

    The BioMAX HEPA Lock Housing is constructed of 16 gauge galvanized steel.
    It is also available in aluminized, stainless steel and epoxy coating, which provides superior corrosion and heat resistance.

    The housings are constructed with two bolt-on doors.
    These doors are pin type and designed to withstand positive and negative pressure.
    They are produced with a closed cell neoprene gasket, which allows for an airtight seal.
    The easy turn hand knobs make the doors removeable.
    BioMAX HEPA Lock Housings are constructed with outer flanges for easy connection to ductwork.

    V-Stage Housing

    V-Stage Housings are constructed of 16 gauge galvanized steel.
    Units are also available in stainless steel, aluminized steel and epoxy coating.


    V-Stage Housings are constructed of 16 gauge galvanized steel.
    Units are also available in stainless steel, aluminized steel and epoxy coating.

    All V-Stage Housing units are supplied standard with two access doors, hinged at the rear of the housing for easy access to the filters.

    Each door is gasketed around the perimeter and at the ends of the tracks. Quick action, positive lock over center draw latches are used to seal the doors. V-Stage housings are equipped with an outer flange for easy connection to ductwork. V-Stage housings are constructed as a one piece assembly for side service installations.

    Units are shipped fully assembled from the factory, ready for installation with a minimum amount of time on the job site.

    Also Available

    • HEPA Grid
    • Bag-In/Bag-Out Housings
    • A8 Frames, Clips and Springs