LEAK TESTING

Filters that pass the overall efficiency test may still have minute pinhole leaks GD filters can be factory scanned to ensure there are no pinhole leaks.Scanning detects these leaks, which are repaired before the filter is released for shipment.

We use a proprietary static scan test with a challenge aerosol of non-toxic, polyfunctional alcohol that leaves no residue on the media. For pharmaceutical and those applications requiring PAO. We offer scanning with this material using a light scattring photometer.

OVERALL EFFICIENCY TESTING

Two methods of overall efficiency testing used :

PAO TEST

PAO TEST - This has been the industry standard for many years. It is conducted using a light scattering photometer. The filter is challenged with Polyalphaolefin ( PAO ).

By measuring the upstream and downstream concentration filter efficiency can be calculated LASER TEST - The filter is tested with a laser spectrometer using polystrene latex ( PSL ) spheres. Filter efficiency is determined by comparing the upstream and downstream concentrations. Efficiencies down to 0.10 micrometers can be determined.

MEDIA TESTING TO MEET EXACTING

QUALITY STANDARD

Every roll of media is carefully checked for a specific set of physical and performance characteristics, including :
• Efficiency
• Resistance
• Thickness
• Weight
• Tensile Strength
• Binder Content
• Water Repellency

UNDERWRITERS LABORATORIES CLASSIFICATION

UL Classified

GD filter are UL Classified. Testing is performed according to UL. Standard 900 and ULC S111 ( except those made with non fire-retardant wood cell sides ).

UL 586

This standard ensures that each filter is individually tested at the factory. Addtiionally, representative filters are tested by UL to ensure that they provide HEPA level filtration, after being subjected to the following conditions.

• High moisture ( 90% R.H. )
• High temperature ( 700oF / 371oC ) short duration
• Low temperature ( 27oF / -3oC )

UL also subjects the filter to a spot flame test ( 1750oF / 954oC ). A numbered UL label certifying that the filter meets Standard 586 is then applied to the filter.

GD filters are constructed with stainless steel or aluminium cell sides and are available for

400o ( 204oC ) - Stainless Steel or Aluminium

500oF ( 260oC ) - Stainless Steel or Aluminium Cell Sides, Red RVT Silicone Board.

750oF ( 399oC ) - Stainless Steel or Aluminium Cell Sides, Black Cement Bond.

Two methods of overall efficiency testing used :

SPECIAL CONSTRUCTION GD FILTERS

GD SIDE ACCESS FILTERS

GD Filters are constructed with a flange at the top and bottom for installation into earlier models of side access housings. The filters are available with wood or metal cell sides.

MILITARY AND NUCLEAR DESIGNS

GD Filters are available to comply with military and nuclear specifications ( ASME AG-1 ) requiring special cell side material, radiation resistant media, rabbeted joints, special testing and special packaging and marking.

PRODUCT INFORMATION

PERFORMANCE DATA

GD 24" x 24" x 111/2

Initial Resistance vs. Airflow Capacity

GD Filters are available In a wide variety of standard sizes and construction material. Special sizes can be fabricated or speacial material used for unique requirements.

There are twelve criteria encompassing materials and performance that go into the makeup of filter. Careful selection on the right combination will result in the filter that best meets the needs of your application.

SIZE

Sizes from 8" x 8" to 36" x 72" Our sizes are listed wth the height dimension first, followed by the width, then depth. Minimum Efficiency

99.97% - 0.3um

99.99% - 0.3um

99.999% - 0.3um

Scan Tested ( Optional )

GD filters can be scan tested to eliminate pinhole leaks.

Media

Waterproof, fire-retardant microglass.Waterproof,fire-retardant, radiation resistant microglass.

Cell Side Material

Plywood

Fire Retardant Plywood

Particle Board

Fire Retardant Particle Board
• Galvanized Steel
• Stainless Steel
• Aluminium

Separators

Aluminium

Vinyl Coated Aluminium

Bond

Polyurethane Elastomer

Silicone

Black Cement

Gasket

Neoprene Expanded Rubber

Silicone

Urethane

Gasket Location

None

One Side

Both Sides

Faceguards ( Optional )

4 x 4 Mesh Hardware Cloth

Glavanized Steel

Stainless Steel

Faceguard Location

None

One Side

Both Sides

UL 586 Classified ( Optional )

Numbered UL certification label to be applied.