Cleanroom Air Distribution Systems

Cleanroom Flexible Air Duct

A bendable reinforced air duct for short cleanroom terminal connections where rigid ductwork cannot absorb alignment or equipment movement.

Tight-Bend Connection
Spring-Wire Reinforcement
Smooth Flexible Liner
Insulated Option Available

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Product Introduction

Cleanroom flexible duct uses a continuous polymer or coated-fabric liner supported by a corrosion-resistant spring-wire helix. It is intended for short final connections between rigid duct branches and diffusers, fan terminals or movable equipment, not as a substitute for long straight mains. An optional glass-fiber blanket and outer vapor jacket limit heat gain and condensation on conditioned-air runs. Correctly extended installation minimizes internal corrugation, while stainless clamps and foil tape secure each end to a smooth metal collar.

Key Features

A spring-wire helix maintains the circular bore through controlled bends and minor alignment changes.

The continuous liner avoids longitudinal metal seams and accommodates equipment vibration.

Insulated versions combine a thermal blanket with a sealed external vapor jacket.

Short standard lengths discourage excessive sag and the pressure loss caused by compressed duct.

Customer Product Concerns

Flexible duct only performs well when it is kept short, fully extended and supported without sharp kinks or compressed coils.

A rigid branch does not align precisely with the terminal collar.The flexible section absorbs the final offset without multiple hard elbows.

Compressed duct corrugations create unexpectedly high pressure loss.The liner is pulled taut and cut to the shortest practical connection length.

Unsupported duct sags above the ceiling and reduces its internal area.Wide straps at close intervals support the full diameter without pinching the jacket.

Cold-air connections sweat where the vapor jacket is punctured.Insulation and outer jacket are closed continuously around both collars with compatible tape.

Typical Applications

HEPA terminal-box connectionsCeiling diffuser branchesFan-powered terminal outletsVibration-isolated equipment linksShort return-air connections

Technical Parameters

Typical construction ranges for reinforced flexible HVAC duct used at cleanroom terminals are shown below.

Core Material	Coated fiberglass fabric or multilayer polymer liner with corrosion-resistant spring-steel helix
Panel Thickness	0.10–0.30 mm flexible liner wall
Effective Width	75–500 mm nominal internal diameter
Maximum Length	7500 mm supplied length; short installed connections recommended
Steel Facing Thickness	0.8–1.5 mm spring-wire diameter, depending on duct size
Core Density	16–24 kg/m³ optional glass-fiber insulation blanket
Thermal Conductivity	0.036–0.043 W/(m·K) for insulated versions
Surface Finish	Smooth inner liner with reinforced silver vapor-barrier outer jacket
Joint Type	Clamped overlap on rigid collar with foil tape and sealed outer vapor jacket
Customization	Available based on the intended application and operating environment.

Available Options

Uninsulated or insulated constructionR4.2, R6 or R8 thermal blanketLow-smoke polymer or coated-fabric linerStainless clamps and cleanroom-compatible sealing tape

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