Cleanroom Wall and Ceiling Systems

Cleanroom Return-Air Riser Wall Panel

A 100 mm hollow wall module that combines a vertical return-air pathway, low-level intake grille and optional pre-filter within the cleanroom partition, avoiding a projecting external return duct.

Concealed Return-Air Path
Low-Level Intake Grille
Flush Wall Integration
Accessible Pre-Filter Option

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Product Introduction

The Cleanroom Return-Air Riser Wall Panel replaces a separate floor-to-ceiling return column with a prefabricated hollow module. Room air enters through a flush grille near floor level, travels upward inside a protected channel and connects to the recirculation plenum or return duct above the ceiling. Gypsum lining and aluminum honeycomb reinforcement stiffen the wide cavity without blocking airflow. A lift-out or hinged intake section gives maintenance access to the optional coarse pre-filter while the remaining wall face stays aligned with adjacent cleanroom panels.

Key Features

A full-height internal passage carries return air without occupying additional room floor area.

Low-wall collection removes air near the zone where heavier particles tend to settle.

A flush stainless steel or coated grille preserves a smooth partition profile.

The optional washable pre-filter can be reached from the clean side through a dedicated cover.

Factory-formed top and bottom transitions reduce leakage around the riser connection.

Customer Product Concerns

Return-wall concerns center on lost floor space, inaccessible filters, noisy air velocity and leakage at duct transitions.

Conventional boxed return columns project into the cleanroom and reduce usable floor area.The hollow riser occupies the same plane and modular width as the surrounding partition.

A concealed pre-filter becomes difficult to wash when there is no clean-side access.A removable lower grille exposes the filter without opening the complete wall assembly.

An undersized intake creates excessive velocity and objectionable airflow noise.Single- or double-riser grille areas can be selected to provide a broader low-level return path.

Gaps at the ceiling connection allow air to bypass the intended return route.A formed top collar and sealed vertical channel direct the captured air into the return plenum.

Typical Applications

Pharmaceutical rooms with top-supply and low-return airflowCleanroom gowning and airlock areasMedical-device rooms using concealed return-air risersLaboratories with concealed recirculation pathsSpace-constrained clean manufacturing rooms

Technical Parameters

This specification follows the common 100 mm integrated return-air wall module used in modular cleanroom systems.

Core Material	12 mm gypsum liner with aluminum honeycomb reinforcement around a hollow air channel
Panel Thickness	100 mm
Effective Width	980 or 1180 mm
Maximum Length	6000 mm
Steel Facing Thickness	0.50 mm
Core Density	750–900 kg/m³ gypsum liner and approximately 27 kg/m³ aluminum honeycomb
Thermal Conductivity	0.17–0.25 W/(m·K) for the lined air-channel assembly
Surface Finish	PE-, HDP- or PVDF-coated steel; stainless steel intake face available
Joint Type	Sealed hollow tongue-and-groove riser with flush removable return grille
Customization	Riser width, grille size and filter access can be adapted to the intended airflow arrangement

Available Options

Single- or double-riser airflow channelAluminum or stainless steel low return grilleWashable coarse pre-filter cassetteHinged or lift-out clean-side access cover

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