APC by Schneider Electric ACSB76152 Uniflair Plenum Sub Base, 200mm
Overview
The APC by Schneider Electric ACSB76152 is a 200mm (8-inch) tall plenum sub base designed for Uniflair precision cooling units, providing a dedicated under-unit airflow plenum chamber in raised-floor and perimeter-cooling data center deployments. At 1016mm wide and 762mm deep, the ACSB76152 establishes a sealed path between the raised-floor void and the cooling unit's underside — critical for maintaining consistent static pressure and predictable airflow distribution across the floor grid. Explore the broader APC by Schneider Electric cooling and power infrastructure catalog for compatible precision air units and accessories.
This is a Frame Size 3 base, finished in black to match Uniflair unit aesthetics. It ships from the factory at 17.7 kg (39 lbs) and arrives in packaging measuring 1118mm × 864mm × 305mm — plan for lift assistance and adequate staging space on delivery day. For integrators specifying entire precision cooling systems, the plenum base is a load-bearing structural component, not just a cosmetic riser, so it belongs on the bill of materials from day one rather than added as an afterthought during commissioning.
Key Features
- 200mm (8-inch) Plenum Height: delivers 200mm of clearance between the finished floor surface and the cooling unit inlet — enough vertical space to allow proper airflow velocity recovery and reduce turbulence before air enters the unit's coil section. Insufficient plenum height is a common cause of uneven coil loading and hot-spot persistence even when cooling capacity is nominally adequate.
- 1016mm (40-inch) Width: matches Frame Size 3 Uniflair cooling unit footprints exactly. Misaligned or undersized bases allow bypass air to short-circuit around the unit rather than through it — this base eliminates that gap by design.
- 762mm (30-inch) Depth: the 76.2 cm maximum depth accommodates the unit's full underside contact area, ensuring the plenum seal is complete on all four sides rather than relying on field-fabricated foam tape or infill panels to close gaps.
- 17.7 kg Structural Mass: the base is heavy enough to remain stable under the weight of a fully charged Uniflair unit without floor anchoring in most raised-floor configurations — though local seismic requirements may dictate additional securing. At 17.7 kg, two-person lift is standard; plan accordingly during installation scheduling.
- Black Finish: matches Uniflair unit cabinetry, which matters in glass-walled data halls and colocation environments where aesthetic consistency is a client expectation, not just a preference.
- Factory-Packaged Dimensions (1118mm × 864mm × 305mm, 22.3 kg): the packaging adds roughly 4.6 kg over the product weight — shipping weight is 22.3 kg. Factor this into freight class calculation and dock equipment requirements, particularly for upper-floor installations without freight elevator access.
Integration and Compatibility
The ACSB76152 is engineered specifically for APC Uniflair Frame Size 3 precision cooling units. It is not a universal plenum riser — installing it under a non-Uniflair unit or a different frame size will produce misaligned airflow paths and structural gaps that defeat the purpose of a plenum chamber entirely. Verify frame size designation on your Uniflair unit's nameplate before ordering. For complete data center cooling infrastructure planning, pair this base with the appropriate Uniflair unit, raised-floor grille tiles, and blanking panels to ensure the plenum operates as a closed system. Consult your data center airflow planning guide for static pressure and CFM calculations before finalizing tile perforation patterns around the unit.
This accessory integrates into standard 600mm raised-floor grid systems. Confirm your floor tile grid aligns with the 1016mm base footprint — partial tile cutouts may be required at the perimeter, and cuts should be planned before the unit and base are positioned to avoid having to move fully assembled equipment later. See compatible raised floor accessories for grille tiles, blanking panels, and cable cutouts designed to work alongside Uniflair installations.
Frequently Asked Questions
Q: What Uniflair frame size does the ACSB76152 fit?
A: The ACSB76152 is designed for Uniflair Frame Size 3 units. The base measures 1016mm wide × 762mm deep, matching the Frame Size 3 footprint. Do not use this base with Frame Size 1 or Frame Size 2 Uniflair units — the dimensional mismatch will leave airflow gaps around the perimeter of the plenum.
Q: How tall is the plenum chamber created by the ACSB76152?
A: The ACSB76152 provides 200mm (8 inches) of plenum height between the raised floor surface and the bottom of the cooling unit. This height is fixed — it is not adjustable in the field.
Q: Can the ACSB76152 be used on a slab floor instead of a raised floor?
A: The plenum sub base is designed to interface with a raised-floor void as the airflow supply path. On a slab floor with no underfloor plenum, the base would create an enclosed chamber with no supply air source, rendering it non-functional for its intended purpose. Slab-floor deployments typically use overhead or in-row cooling configurations that do not require a plenum base.
Q: What is the shipping weight of the ACSB76152?
A: The packaged unit ships at 22.3 kg (approximately 49 lbs), with packaging dimensions of 1118mm × 864mm × 305mm. Plan for two-person handling and verify dock equipment capacity, particularly for upper-floor installations.
Q: Is the ACSB76152 a structural load-bearing component?
A: Yes. The base supports the full weight of the Uniflair cooling unit above it. It is not a cosmetic riser — it is a structural element of the cooling unit installation. Verify that the raised-floor panel grid and pedestals beneath the base location are rated for the combined load of the base (17.7 kg) plus the cooling unit weight before committing to a floor position.
The ACSB76152 is one of those components that gets ordered as an afterthought and then causes a half-day delay on installation day when someone realizes the Uniflair unit is sitting at slab level with no plenum path. The 200mm height is non-trivial — that's the spec that determines whether your underfloor static pressure reaches the coil face uniformly or bleeds off through tile gaps before it gets there. Get this on the BOM at the design stage, not during commissioning.
Technical Highlights:
- 200mm Fixed Plenum Height: provides a consistent 8-inch air column beneath the Frame Size 3 Uniflair unit — enough clearance to achieve stable static pressure across the full coil inlet area without requiring custom plenum fabrication or foam-tape gap-filling.
- 1016mm × 762mm Footprint: dimensionally matched to Frame Size 3, so there are no perimeter gaps to seal. Any deviation from exact frame size match introduces bypass air paths that reduce effective cooling capacity — this base eliminates that variable entirely.
- 22.3 kg Packaged Weight: the 4.6 kg packaging delta over the 17.7 kg product weight signals a reasonably robust shipping enclosure, but the 1118mm × 864mm package footprint means standard pallet jacks and doorway clearances need to be confirmed before the delivery truck arrives, especially in retrofit data hall expansions with constrained access corridors.
Deployment Considerations:
- Confirm raised-floor pedestal load ratings at the planned installation position before placing the base — the combined static load of the ACSB76152 (17.7 kg) plus a fully charged Uniflair unit can exceed standard 600mm grid pedestal ratings in older raised-floor systems.
- This base is not field-adjustable in height — if your raised-floor void depth or underfloor cable tray layout requires a non-200mm plenum height, the ACSB76152 is the wrong part. There is no shimming or stacking solution that maintains the sealed plenum integrity the unit requires.
This base is the right call for greenfield data center builds and structured colocation expansions where Uniflair Frame Size 3 units are being deployed on a standard raised-floor grid — it keeps the plenum sealed, the installation clean, and eliminates the field improvisation that causes airflow problems six months after go-live.
