Cleanroom Doors, Windows and Interlock Systems

Automatic Door Drop Seal

A concealed door-bottom mechanism that lowers a resilient seal onto the floor only when the door reaches the frame.

Automatic Lowering Action
Retracts During Opening
Even Floor Contact
Cut-to-Length Carrier

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Product Introduction

The automatic door drop seal fits into a mortised channel along the bottom of the cleanroom leaf. As the door closes, a frame-side plunger drives an internal linkage that lowers the silicone or EPDM sealing element evenly toward the floor. Opening releases the plunger and retracts the gasket into its aluminum carrier, reducing drag, wear and contamination pickup compared with a permanently rubbing sweep.

Key Features

Parallel drop action follows the threshold without sweeping debris across the floor.

The gasket retracts inside the carrier whenever the door opens, limiting abrasion and damage.

An adjustable plunger sets the release point and compensates for installation tolerance.

The aluminum carrier can be trimmed within its permitted range to match the door width.

Customer Product Concerns

The door bottom must seal pressure leakage without creating continuous friction against a smooth cleanroom floor.

A fixed rubber sweep drags during every cycle and leaves wear marks on the floor.The sealing blade stays retracted until the leaf reaches the closing frame.

Uneven thresholds leave leakage at one end of a rigid bottom seal.The internal mechanism lowers the resilient gasket progressively along the opening.

An exposed surface strip creates a visible ledge along the clean face.The carrier is mortised into the door bottom with only the gasket outlet exposed.

Typical Applications

Airtight cleanroom swing doorsPersonnel airlock doorsLaboratory pressure-control doorsAcoustic controlled-area entrances

Technical Parameters

Typical section dimensions and material data for a compact cleanroom automatic drop seal are provided below.

Core Material	Extruded aluminum carrier with silicone or EPDM drop gasket and steel linkage
Panel Thickness	Approximately 14–16 mm carrier thickness
Effective Width	Approximately 14–20 mm mortise width
Maximum Length	Up to 1200 mm for common single-door sizes
Steel Facing Thickness	0.8–1.2 mm stainless-steel end plates and actuating components
Core Density	Approximately 1100–1300 kg/m³ for the resilient EPDM sealing element
Thermal Conductivity	Approximately 0.20–0.30 W/(m·K) for the elastomer gasket
Surface Finish	Natural or clear-anodized aluminum carrier with smooth black or gray gasket
Joint Type	Mortised door-bottom carrier with frame-activated plunger and parallel drop blade
Customization	Available based on the intended application and operating environment.

Available Options

Silicone or EPDM gasket335–1200 mm cut-to-length rangeSingle- or double-actuation mechanismMortised or slim surface-mounted carrier

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