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Air Filters and Chemical Filtration
Knife-Edge HEPA Filter
A mini-pleat HEPA panel with an integral perimeter blade that enters the gel channel built into a ceiling grid or terminal housing.
- Integral Aluminum Knife Edge
- Gel-Grid Compatibility
- Common-Plenum Installation
- Positive Perimeter Engagement
Product Introduction
The knife-edge HEPA filter incorporates a thin continuous blade into the extruded-aluminum frame rather than carrying the gel on the filter itself. When the panel is lowered into a cleanroom ceiling grid or terminal housing, this blade enters the receiving gel trough and forms a fluid seal around all four sides. The mini-pleat media pack is potted within a separate frame cavity, and protective faceguards shield the filter during common-plenum installation. This configuration is especially useful where the ceiling grid retains the reusable gel channel and filter weight assists the sealing engagement.
Key Features
The blade engages the reusable gel channel built into compatible ceiling grids or equipment.
Filter weight and optional retainers maintain consistent penetration without crushing a foam gasket.
The sealing blade is physically separated from the potted mini-pleat pack to protect media integrity.
Customer Product Concerns
Knife-edge filters require precise blade geometry and careful alignment so the complete perimeter enters the receiving gel without damaging the trough.
A replacement filter does not align with the reusable ceiling-grid gel trough.A dimensionally controlled extruded blade follows the modular frame perimeter and enters the specified channel centerline.
Sharp or rough blade joints tear the gel surface during installation.Smooth mitered corners and deburred continuous edges allow clean penetration around the full frame.
A shallow blade disengages when the ceiling grid deflects.The blade projection is matched to the gel-trough depth with sufficient engagement allowance.
Installers press on the media face while seating the perimeter blade.A rigid aluminum frame and protective faceguard provide safe load-bearing handling points.
Typical Applications
Common-plenum cleanroom ceilingsGel-channel fan filter unitsPharmaceutical production suitesMicroelectronics cleanroomsTerminal housings with reusable fluid troughs
Technical Parameters
Typical construction ranges for an integral knife-edge mini-pleat HEPA filter are shown below.
| Core Material | Low-pressure-drop microglass or expanded-fluororesin membrane media in a separatorless mini-pleat pack |
|---|---|
| Panel Thickness | 70-100 mm media frame plus 20-40 mm integral knife-edge projection |
| Effective Width | 305-610 mm ceiling-module width |
| Maximum Length | Up to 1220 mm panel length |
| Steel Facing Thickness | 0.45-0.65 mm optional epoxy-coated steel upstream and downstream faceguard |
| Core Density | Approximately 88-148 kg/m³ nominal knife-edge mini-pleat pack density |
| Thermal Conductivity | Approximately 0.030-0.038 W/(m·K) for dry microglass or membrane media |
| Surface Finish | Clear anodized-aluminum frame with a smooth deburred perimeter knife edge |
| Joint Type | Integral perimeter knife edge inserted into the gel channel of the matching ceiling grid or housing |
| Customization | Available based on the intended application and operating environment. |
Available Options
H13, H14 or ULPA media20 mm or 40 mm blade projectionUpstream or downstream knife-edge orientationSingle-piece or reinforced long-format aluminum frame
Planning a Knife-Edge HEPA Filter specification?
Send us your dimensions, installation conditions, performance targets and required surface finish.
