Hepa Filter – Two Stage Filter and Frame for Biological Safety Cabinet

Industry: Biological Safety Cabinets for Europe
Application: Design a two stage redundant HEPA Filter to meet EN1822 Standard H14 (99.995% @0.3 µm)

APC Filtration Inc. was contacted by a biological safety cabinet manufacturer who required design of a two-stage HEPA filter. The second stage HEPA filter would serve as a safety measure should the first stage HEPA fail. A 1″ w.g. pressure drop is achievable in a single stage filter, but presents a challenge for a two stage design to meet EN1822 H14 filter efficiency and testing requirement. Other needs included metal-free, non-toxic raw materials to eliminate hazardous gases during disposal by incineration. Packaging design had to insure filters would not be damaged in shipping.

Our Custom filter design incorporated the following improvements:

  • Filter Frame: We enlisted the services of a wood specialist, who helped determine raw material selection, sealed seam construction and frame assembly to create a leak-free high density wood frame.
  • Non-Toxic Materials: We eliminated all toxic materials previously in use.
  • Reduced Pressure Drop: APC tested several combinations of secondary and primary filter medias, varying the filter area of each to meet H14 efficiency.  We then tested airflow dynamics between the secondary and primary filters to determine the optimal spacing and pleat direction between each pleat pack, until successfully achieving a 1″w.g. pressure drop.
  • Custom Designed Packaging: Was created to eliminate shipping damage.

Two years after providing a solution for this client’s filtration dilemma, today APC supplies 100% of all their critical air filter requirements.

To learn more about this biological safety cabinet filter project, our HEPA filters, or about our other products and services, please

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Custom Designed Two Stage Filter and Frame Specifications:

Product Description Custom Filter Design – Two Stage H14 HEPA Filter
Filtration Efficiency Capabilities
MERV Rating ASHRAE 52.2-2007 BS EN779:2002
60 – 65%
70 – 75%
80 – 90%
90 – 95%
F6 – 60-80%
F6 – 60-80%
F7 – 80-90%
F8 – 90-95%
F9 – >95%
BS EN1822:2009 IEST RP-CC001.5 – (0.3 µm)
E10 (formerly H10)
E11 (formerly H11)
E12 (formerly H12)
EN1822-5:2009 IEST RP-CC001.5 – (0.12 µm)

Custom designed filters to meet any filtration efficiency

Filter Frame Sizes Custom frame sizes available at additional tooling charge.
Custom frame sizes available in any size or shape.
Frame Materials Plastic – high impact ABS, PVC, PS and custom molded or extruded profiles as required.
Wood – plywood and special MDF
Metal – extruded aluminum, 22g and 24g galvanized metal, roll formed in any gauge as required.
Minimum Order Quantity (MOQ) Custom Design – 100 pcs (plus any applicable tooling)
Delivery Time Production: 3- 4 weeks
Tooling: 10 to 12 weeks
Delivery Location FOB: Manufacturing & Warehouse Locations
Brantford, Ontario Canada
Buffalo, New York, USA
Rancho Dominguez, California, USA
Port of Shanghai, China
Quality Management System ISO 9001:2015
Laboratory Testing Capabilities U shaped Duct Testing to ASHRAE 52.2 and EN779 standards.LMS2000 the most accurate test system for HEPA and ULPA Filters.

Horizontal Duct Testing to ASHRAE 52.1 and old EN779 Standards for Dust Spot Efficiency, Arrestance and Holding Capacity.

Maximum Panel Filter size for test lab = 72″ x 24″ x 24″ deep.
Maximum Radial Filter size for test lab = 48″ diameter x 24″ deep.

Product Design & Graphic Software Capabilities Solidworks 3D Design
AutoCAD 2D
Adobe Illustrator
Other Applications for Panel Filters
Aerospace Manufacturing
Air Atomization
Air Purifier Equipment & Appliances
Appliances, Industrial, Commercial & Domestic
Automotive Manufacturing
Biological EquipmentContainment Systems
Disaster Recovery Ventilation Equipment
Electric Utilities
Food & Beverage Manufacturing
Food Processing
Health Care
HazMat Equipment
Hospital Equipment
Infection Isolation Rooms, Surgical Suites
Institutional Facilities
Medical Appliances & Equipment
Microelectronics, Semiconductor
Pharmaceutical Equipment & Production
Protective Environment Rooms
Research Facilities
Sensitive Processes
Solar Panel Manufacturing
University Laboratories
Vacuum Cleaners – Industrial

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