Air Filters

Commercial Air Filters

Extended Surface
Bag Air Filters

Extended surface
non-supported bag filter
Also Available in
MERV 11, 12, 13 and 14

Holt Filters Inc., extended surface non-supported bag 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, face dimensions, pocket number and depth, our BAG FILTER provides optimal performance in air handling systems where the air flow is constant.

The standard offering is rated by Underwriters Laboratories as Class II, per UL Standard 900. Class I rated products are available as an option.

Rigid construction, extended surface, long service life and savings in energy costs are features and benefits which make our bag filters an excellent option for meeting the requirements of medium to high efficiency filtration.


  • Electrogalvanized headers and internal pocket supports 100% synthetic polypropylene media
  • Sonically sealed pocket edges, ends and flutes
  • Nominal pocket depths range from 12” to 36”
  • 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
  • UL Class II rated as per UL 900 standard, also available in UL 900 Class 1

Galvanized metal frame, (header) and internal pocket support retainers, (jchannels) provide strength and rigidity to this product.

The pockets, comprised of 100% polypropylene fibers, are secured within the inside perimeter of the header by a crimping process between individual j-channels. Each pocket is sonically sealed along the outside edges to prevent bypass.

Holt Filters Inc. full line of BAG filters are designed to work suitably within built up filter banks and/or side access systems. The standard header thickness is 7/8”. A Cambridge style header, (1 1/8”) is 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 MERV 11 through MERV 14 bag air filters.

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Extended Surface Non-Supported
Bag 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