Air Filters

Commercial Air Filters

Self Supported
Rigid Air Filters


Single Header

Double Header

Available in 6” and 12” depths

Also Available in MERV 11, 12, 13 and 14 efficiencies per ASHRAE 52.2

Holt Filter's extended surface self-supported rigid box filters are designed for use in air filtration systems and equipment where medium to high efficiency filtration is required. Available in a wide variety of standard sizes and depths, the FILTER PAK provides optimal performance in variable air volume systems.

The standard offering is rated by Underwriters Laboratories as Class II, per UL Standard 900.

Rigid construction, extended surface, low initial pressure drop measured in inches w.g., long service life and savings in energy costs are features and benefits which make the FILTER PAK an excellent option for meeting the requirements of medium to high efficiency filtration.


  • 26 ga Galvanized Metal Frame
  • Injection molded plastic media separators
  • Optional galvanized metal media separators
  • 100% polypropylene media
  • Available in box style and headered construction
  • Available in 6” and 12” depths
  • Available in 50%, 65%, 85%, and 95% efficiencies per ASHRAE 52.1
  • Available in MERV 11, 12, 13 and 14 efficiencies per ASHRAE 52.2
  • Expanded metal media support grid
  • Water resistant media to frame adhesive
  • UL Class II rated as per UL 900 standard

Galvanized frame construction, diagonal metal support stabilizers, injection molded plastic media separators and expanded metal media support create one of the most rigid filters of its type in the industry.

The media pack, comprised of 100% polypropylene fibers, is bonded to the inside perimeter of the enclosure frame by a moisture resistant adhesive, providing a continuous and positive seal.

Holt Filters Inc. full line of The FILTER PAK is designed to work suitably within built up filter banks and/or side access systems. The standard offering is box-type in construction. Peripheral headers, (7/8”) are available as an option.

(Minimum Efficiency Reporting Value) are used by the HVAC (Heating, Ventilating and Air Conditioning) industry to describe a filter's ability to remove particulates from the air. A higher MERV rating means better filtration and greater performance. Holt Filter's Inc. now provides both MERV 7 and MERV 11 HVAC air filters.

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Self Supported Rigid Air Filters

  1672 N. Hercules Ave. Unit G
Clearwater, FL 33765

Phone: 727-449-8448
Fax: 727-449-8948


Call or Fax us your Commercial, Residential or Custom filter needs.

We not only ship locally, we ship anywhere in the continental United States.

Commercial Air Filters                            Residential Air Filters