APC by Schneider Electric ACDC2551 Aisle Containment Depth Adapter
Overview
The ACDC2551 is a mechanical depth adapter for APC NetShelter aisle containment systems, solving a specific physical mismatch: when your containment overhead structure is sized for 750mm-deep racks but your installed enclosures run at 600mm depth. Without this adapter, the gap between the rack top and the containment canopy breaks the hot-aisle or cold-aisle seal — negating the thermal efficiency the containment system was installed to deliver. The ACDC2551 bridges that 150mm delta, restoring a continuous sealed plenum and keeping conditioned air where it belongs. At 41.29 lb (18.73 kg) and 75.35 inches in length, this is a structural component requiring planned installation, not a field-improvised fix.
Compatibility
Designed for APC by Schneider Electric NetShelter aisle containment configurations where overhead canopy depth is 750mm and rack enclosure depth falls in the 600mm range, targeting row lengths in the 1070mm to 1200mm span. Confirm your specific aisle containment canopy model and rack depth before ordering — this adapter addresses one specific depth transition (600mm rack to 750mm containment) and is not a universal fit across all NetShelter depth pairings. Consult APC's NetShelter compatibility matrix for your exact canopy SKU to verify the 1070–1200mm row-length range applies.
Installation Notes
Package dimensions of 80.12 in × 12.87 in × 3.70 in (203.5 × 32.7 × 9.4 cm) at 47.53 lb (21.56 kg) shipped weight indicate a long, flat structural panel — staging and lift planning is required in tight data center aisles. Overhead installation at rack-top height with two-person handling is strongly recommended given the length-to-weight ratio. Verify ceiling clearance above existing containment canopy before delivery. No power, cabling, or environmental conditioning connections are involved — this is a passive structural adapter. Refer to APC's rack accessories installation guide for torque specifications and fastener requirements specific to your canopy model.
