Panduit FRIV4524X4LYL FiberRunner 24x4 Inside Vertical 45° Fitting
Overview
The Panduit FRIV4524X4LYL is an inside vertical 45-degree fitting for the FiberRunner™ 24x4 cable routing system, designed for data centers and telecommunications central offices where structured fiber pathways need to change plane without sharp bends. This fitting creates a 45° upward transition out of a straight horizontal run — giving you a smooth, bend-radius-compliant curve rather than a hard corner that would stress delicate fiber strands over time. It is designed to pair with the outside vertical fitting FROV4524X4LYL when a complete plane change requires both an inner and outer radius component.
Built from Polycarbonate/ABS and finished in yellow for quick visual identification in dense cable environments, the FRIV4524X4LYL is UL-listed under 2024A for fiber cable routing assemblies and meets Telcordia GR-63-CORE NEBS Level 3 requirements — the benchmark for telecom carrier-grade environments where equipment must survive seismic, thermal, and airflow stresses.
Key Features
- Inside 45° Vertical Geometry: Creates a controlled upward 45-degree transition in a FiberRunner 24x4 horizontal run. The inside radius keeps fiber bend angles within manufacturer-specified minimums — critical for maintaining signal integrity on single-mode runs where bend loss compounds over distance.
- Pairs with FROV4524X4LYL: This fitting handles the inner radius; the companion outside fitting FROV4524X4LYL handles the outer radius when you need a full plane change from horizontal to angled. Ordering both together is mandatory for a structurally complete transition — this unit alone does not complete the bend assembly.
- Polycarbonate/ABS Construction: The PC/ABS blend delivers impact resistance and dimensional stability across the temperature swings common in active data center hot/cold aisle layouts. It won't warp or crack from the thermal cycling that degrades simpler PVC fittings in high-airflow environments.
- NEBS Level 3 / Telcordia GR-63-CORE Compliance: Meeting NEBS Level 3 means this fitting has been tested against the seismic, thermal shock, and airflow criteria that telecom carriers require for central office deployments. If your customer is a carrier, CLEC, or colocation provider with NEBS mandates, this fitting satisfies that requirement — a lesser-rated fitting would not.
- UL Listed (2024A): The UL 2024A listing for fiber cable routing assemblies is the standard AHJs and enterprise IT departments look for at plan review. Using UL-listed raceways and fittings throughout the run keeps inspections straightforward and avoids field rejection.
- RoHS Compliant: Hazardous substance compliance is a procurement requirement for most enterprise and government environments. The FRIV4524X4LYL ships RoHS-conformant out of the box — no additional documentation burden.
- Yellow Color Coding: The yellow finish follows standard data center color conventions for fiber pathways, making it easy to visually trace fiber routes in dense cable trays during moves, adds, and changes — reducing the chance of accidental disconnection during maintenance.
- Compact Footprint for Dense Installations: At 10.24 in. wide × 8.15 in. tall with a 25.76 in. overall length, this fitting is sized specifically for the 24x4 channel. Using the correctly sized fitting (not a larger 4x4 or 6x4 variant) keeps the pathway tight to the rack structure and leaves adjacent space available for power and copper runs.
Integration & Compatibility
The FRIV4524X4LYL is exclusively compatible with the Panduit FiberRunner 24x4 system — the 24-inch wide by 4-inch deep channel format used in high-density fiber cable management installations. It does not fit 2x2, 4x4, 6x4, or 12x4 FiberRunner channels; channel width and depth must match exactly for the snap-fit and cover system to seat properly.
When planning a data center fiber infrastructure run that requires a 45° plane change, source both the FRIV4524X4LYL (inside fitting) and its companion FROV4524X4LYL (outside fitting) before installation. The outside fitting completes the structural bend; the inside fitting alone leaves an open gap on the outer radius. Both are sold individually (package quantity: 1 each).
FiberRunner covers sold separately — confirm cover part numbers for the 24x4 channel from the Panduit fiber routing systems catalog to maintain a fully enclosed, protected pathway.
Frequently Asked Questions
Q: What other fitting do I need to complete a 45° vertical plane change with the FRIV4524X4LYL?
A: You need the companion outside vertical 45° fitting, part number FROV4524X4LYL. The FRIV4524X4LYL handles the inside (inner) radius of the bend; the FROV4524X4LYL handles the outside (outer) radius. Both are required for a structurally complete transition — the inside fitting alone leaves an open gap on the outer radius of the bend.
Q: Is the FRIV4524X4LYL compatible with FiberRunner 4x4 or 6x4 channels?
A: No. This fitting is sized exclusively for the 24x4 FiberRunner channel (24 inches wide, 4 inches deep). It will not properly seat in or mate with 4x4, 6x4, or 12x4 channel formats. Always match the fitting to the exact channel width and depth in your installation.
Q: Does the FRIV4524X4LYL meet NEBS Level 3 requirements?
A: Yes. It meets the relevant test requirements in Telcordia GR-63-CORE for NEBS Level 3, making it suitable for telecom carrier central office and colocation deployments that mandate NEBS compliance for all pathway components.
Q: Is the FRIV4524X4LYL UL listed?
A: Yes. It is UL-listed under standard 2024A for fiber cable routing assemblies, which is the applicable UL listing for structured fiber raceways. This satisfies AHJ and plan review requirements in most jurisdictions.
Q: What are the overall dimensions of the FRIV4524X4LYL?
A: Overall length is 25.76 in., overall width is 10.24 in. (260.1 mm), and overall height is 8.15 in. (207 mm). Use these dimensions when laying out clearance requirements in the rack row or overhead tray run.
Q: Are covers included with the FRIV4524X4LYL?
A: No. The fitting ships without covers. FiberRunner covers for the 24x4 channel are sold separately. Confirm the appropriate cover part numbers from the Panduit FiberRunner catalog for your channel size before ordering.
The FRIV4524X4LYL is one of those fittings that looks straightforward on paper but causes problems when it shows up on-site without its companion piece. This is the inside-radius half of a 45° vertical plane change in a FiberRunner 24x4 run — it does not complete the bend on its own. The matching outside fitting FROV4524X4LYL must be on the same order. I've seen installs stall waiting on a single companion fitting that wasn't included in the original BOM.
Technical Highlights:
- NEBS Level 3 (Telcordia GR-63-CORE): Carrier and colocation contracts routinely require NEBS compliance on all pathway components, not just active gear. This fitting passes the seismic and thermal shock criteria — specify it by part number in the project documentation so it's not substituted with a non-compliant fitting during procurement.
- UL 2024A Listing: The UL 2024A listing for fiber cable routing assemblies is what plan reviewers and AHJs check. In jurisdictions where the NEC applies to structured cabling pathways, using listed fittings throughout the run prevents field corrections that cost more than the fittings themselves.
- PC/ABS Material at 10.24 in. × 8.15 in. × 25.76 in.: The Polycarbonate/ABS blend handles the thermal cycling in active data center aisles without warping. At these dimensions, the fitting is a tight fit in constrained overhead spaces — measure clearance before the run is complete, not after.
Deployment Considerations:
- Order FROV4524X4LYL at the same time as the FRIV4524X4LYL — the inside fitting and outside fitting ship separately (package quantity 1 each) and both are required to complete the 45° transition. Omitting either leaves the pathway structurally incomplete and fiber exposed at the bend.
- This fitting is channel-specific: it fits only the 24x4 FiberRunner format. Verify that the straight sections in your run are also 24x4 before ordering — mixing 12x4 or 6x4 sections with 24x4 fittings will not mate correctly.
Best-fit scenario: a high-density carrier central office or enterprise colocation row where a 24x4 FiberRunner horizontal run must transition 45° vertically to reach overhead ladder rack or a cabinet-top cable exit, and the project spec mandates NEBS Level 3 and UL-listed components throughout.
