Application
Luna-PBM is intended for use as a plenum box in ceilingmounted air distribution systems. The product can be used for both supply air and extract air applications, depending on the selected configuration and connected diffuser front. For supply air applications, Luna-PBM provides air distribution, airflow adjustment and measurement functionality. For extract air applications, the product can be used as a connection and balancing unit when configured according to the relevant installation requirements. The product is suitable for offices, schools and other commercial buildings where ventilation layouts may change over time. The modular PBM design makes the product particularly relevant for buildings with changing room layouts, tenant adaptations or
future refurbishment needs.
Functional description
Luna-PBM connects the duct system to the selected diffuser front and supports airflow regulation and commissioning. The plenum includes an integrated airflow adjustment damper and measurement outlets for airflow verification. In supply air applications, the plenum contributes to even airflow distribution to the diffuser front. Internal sound absorbing material contributes to reduced sound levels from the air distribution unit. In extract air applications, Luna-PBM provides a connection between the room-side air terminal and the duct system, with the possibility of airflow adjustment and measurement depending on configuration.
Design
Luna-PBM is based on a cylindrical plenum design. Compared with traditional rectangular plenum boxes, the cylindrical geometry enables a modular construction and supports conversion between different installation types.
PBM – Plenum Box Modular:
- patented modular plenum concept
- cylindrical plenum design
- adaptable between exposed installation and ceiling installation
- can be rebuilt without replacing the main product
- suitable for future layout changes and refurbishment
- designed for use with compatible diffuser fronts
Material and surfaces
The plenum box is manufactured in galvanised steel. The unit is internally lined with sound absorbing polyester material and equipped with an EPDM rubber gasket on the connection spigot.
Internal components may vary depending on configuration and application.
Accessories
Flow insert for supply air applications, Luna-PBM may be equipped with a removable flow insert to support even airflow
distribution to the diffuser front. The flow insert can be removed and reattached by means of a spring steel ring positioned in the
groove of the spigot. For extract air applications, the flow insert shall be removed if required by the selected configuration.
Commissioning
Luna-PBM includes an integrated airflow adjustment damper and measurement outlets for airflow verification. The damper can be adjusted and locked in the required position, allowing accurate balancing during commissioning. The commissioning procedure depends on whether the product is used for supply air or extract air, and on the selected diffuser front. Airflow data and correction factors shall be taken from the documentation valid for the complete product configuration.
Maintenance
Maintenance is normally limited to periodic inspection and cleaning. The connected diffuser front can be removed to provide access to the damper, measurement points and internal components, depending on the selected configuration. The flow insert, when fitted, can be removed and reattached for inspection, cleaning or reconfiguration.
Environment
Luna-PBM is designed to support sustainable and flexible building solutions. In modern buildings, ventilation products are often replaced due to changed layouts, new
tenant requirements or altered installation conditions rather than technical end of life.
The patented PBM concept enables the plenum box to be rebuilt
and adapted between installation types. This can extend the
actual service life of the product and reduce the need for
replacement.
The concept contributes to:
- reduced material consumption
- lower waste generation
- fewer product replacements during refurbishment
- increased flexibility during design and late-stage project changes
- improved adaptability over the building lifetime
