Panduit XG-TCBS1B FlexFusion™ Top Cap Brush Seal Kit, 1070mm, Black

The Panduit XG-TCBS1B is a 1070mm top cap brush seal kit engineered for FlexFusion™ cabinet systems to eliminate airflow bypass at the cabinet roof. In high-density server and network deployments, unsealed cable entry points at the top of racks create a direct path for cold supply air to mix with hot exhaust, undermining containment strategies and forcing CRAC units to overcool to compensate. This brush seal kit blocks that recirculation channel while maintaining easy cable access, letting you maintain the thermal boundaries your cooling infrastructure depends on.

Key Features

1070mm length designed for FlexFusion top cap assemblies

Dense brush seal construction blocks air bypass while permitting cable routing

Black powder-coat finish matches FlexFusion cabinet aesthetics

Tool-free installation into existing top cap channels

RoHS compliant for environmentally responsible deployments

Single-unit package for targeted gap remediation or new cabinet builds

Thermal management in modern data centers hinges on maintaining strict separation between cold supply air and hot equipment exhaust. Hot aisle/cold aisle containment architectures deliver measurable PUE improvements, but only when every potential bypass path is sealed. The top of the cabinet is a persistent vulnerability: cables must enter and exit, yet every unsealed gap allows hundreds of CFM of short-circuit airflow that defeats your containment investment. Traditional foam or rubber seals either block cable access entirely or compress over time, creating gaps. Brush seals solve both problems with flexible bristles that conform around individual cables, self-seal when cables are removed, and maintain their sealing performance across thousands of adds/moves/changes. The XG-TCBS1B integrates directly into FlexFusion top cap assemblies, creating a continuous brush barrier across the full 1070mm width of the cabinet opening. The bristle density is calibrated to allow single-cable or small-bundle insertion without tools while blocking the bulk airflow that causes thermal problems.

Installation is straightforward for technicians familiar with FlexFusion systems. The seal kit slides into the dedicated channel machined into the top cap, with retention clips that lock it in place without fasteners. If you're outfitting new cabinets, install the seal before the first cable pull. For retrofit applications on existing racks, you can install the seal with cables in place by gently threading them through the bristles, then pressing the seal into its channel. The 1070mm length matches standard FlexFusion top cap widths, eliminating the need for field trimming or gap-filling. Once installed, the brush seal remains effective across your equipment lifecycle, accommodating cable additions and removals without degradation. Pair this top seal with FlexFusion base brush grommets and blanking panels for a complete cabinet-level containment solution that supports the return temperatures your CRAC units expect.

RoHS compliance ensures this component meets restrictions on lead, mercury, cadmium, and other hazardous substances, aligning with corporate sustainability mandates and equipment disposal regulations. The black finish maintains a professional appearance in customer-facing or glass-walled data centers where aesthetics matter. For integrators managing multi-cabinet hot-aisle containment corridors or cold-aisle enclosures, the XG-TCBS1B is a low-cost, high-impact intervention that closes one of the most common thermal bypass paths. In deployments where every degree of return-air temperature matters — think 40kW+ racks or facilities running close to cooling capacity — sealing the top of the cabinet can be the difference between stable operation and thermal throttling.