VariCel Single Header Filter

Product Overview

  • Dual-density media increases filter life and reduces operating costs
  • Open header design prevents dirty air bypass and makes handling safe and easy
  • Designed to perform in the most difficult operating conditions such as variable air volume, turbulent airflows, and repeated fan shutdown
  • Rated for continuous operation at temperatures up to 350°F
  • MERV 15, MERV 14, MERV 13, and MERV 11 efficiencies
  • MERV 14 available with antimicrobial
  • MERV 13 and higher meet LEED® Project Certification efficiency requirements and recommended efficiency for filtration of airborne viruses
  • UL Classified
  • MERV 11
  • MERV 13
  • MERV 14
  • MERV 15
Filter Depth
  • 6"
  • 12"
Media Type
  • Dual-Density Fiberglass
Frame Material
  • Galvanized Steel
  • Aluminized Steel
Separator Style
  • Aluminum
Header Type
  • Single Header
  • Double Header
Special Size Available
  • No
Antimicrobial Available
  • Optional
Max Operating Temperature
  • 350˚F (177˚C)
  • UL900
  • ULC-S111

Built Rugged for Dependable Performance

VariCel's rigid construction with supported pleat media pack maintains a compact, unitized structure even under tough operating conditions. Variable air velocity and repeated fan shut-down do not compromise performance. The VariCel filter performs well in conditions up to 350°F, unlike competitive box-style/rigid filters that use media or adhesives that are more prone to melting at elevated temperatures. VariCel HT filters are also available, which can be rated for operating temperatures up to 900° F

Galvanized steel headers and cell sides resist damage during shipping and handling, and prevent corrosion over long service life (HT VariCel filters are constructed of aluminized steel).

The VariCel media pack is designed to minimize movement and prevent media damage. During the pleating process, spots of glue are applied to bond each separator to the adjacent pleat. This reinforcement increases burst strength to prevent the filter from blowing out under variable air volume conditions or unusually high resistance. In addition, water-resistant media along with the metal separator design makes VariCel filters ideal for installations in humid areas.

Designed to Improve Indoor Air Quality

VariCel filters are designed specifically to improve Indoor Air Quality (IAQ). With efficiencies up to MERV 15, VariCel filters effectively trap and control small airborne droplets that could carry viruses and bacteria, and other airborne lung-damaging particles.

MERV 14 VariCel filters are also available with antimicrobial. Air filters are designed to trap and concentrate particulate air contaminants, including viable fungal and bacterial spores. The presence of an antimicrobial preservative in the filter media is intended to preserve the integrity of the media throughout the useful life of the filter and prevent "grow-through" of any microbe collected by the filter. Note that antimicrobial preservatives are not meant to increase the efficiency of the filter, nor to kill microorganisms “on the fly” as they pass through a filter. Antimicrobial is EPA registered and environmentally safe.

Dual-Density Media Reduces Operating Costs

VariCel media is manufactured with two layers of glass fibers, coarser fibers on the air-entering side, and finer fibers on the air-leaving side. Our dual density design allows dirt particles to be collected throughout the entire depth of the filter, utilizing the full cleaning potential of the media. Maximum dust holding capacity extends the life of the filter, maintaining low resistance to airflow over the usable life of the filter and minimizing operating costs.

Unitized Construction

Interlocked header and cell sides, along the entire length of each side, provide maximum sealing. Competitive filters are designed with loose fitting headers, which allow greater potential for bypass leakage.

Easy Installation

Rigid construction and minimum depth make VariCel filters easy to install in all types of systems.

Type SH Single Header

VariCel filters are designed for framing systems supplied by AAF Flanders. A unique 1316″ flanged header on the air-entering side allows the filter to be easily inserted and latched into front and side access systems.

Type DH Double Header

VariCel filters are designed to upgrade air cleaning performance and reliability. Two 13⁄16″-thick flanged headers make the filters compatible with the holding frames and latching devices of various manufacturers, including rear access systems.

XL Series

VariCel filters, single header (XL-S) and double header (XL-D), contain up to 67% more media and offer more than twice the service life of standard single and double header models. XL Series VariCel filters are offered in a 12″ depth, MERV 14 and MERV 11.

Type HT (High Temperature) Series

VariCel filters are designed for systems operating from 350°-900°F. Constructed of aluminized steel, HT VariCel filters offer rated efficiency with proven reliability over the life of the filter. HT VariCel filters are offered in a 12″ depth, MERV 14 and MERV 11.

Type NH Series

VariCel filters are designed for special sizes and applications, including incineration and compaction disposal systems. Manufactured of fire retardant, ¾″-thick, heavy wall particle board, Type NH VariCel filters are UL Classified and are operable at temperatures up to 200°F. The filters are constructed without headers, and cell sides are flush with front face dimensions.



VariCel filters can be ordered with faceguards made of flattened, expanded, galvanized, or aluminized steel on one or both sides of the filter.

Factory-installed gaskets are available on the front or back of the header.

Vinyl coated separators are available for corrosive conditions.

1⅛″ Single Header VariCel filters, designed for other manufacturers' equipment, are also available.


For sizes and performance data:

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VariCel Filter
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