Middle Atlantic 1 Space Flat Aluminum Blank Panel - PHBL-1

Middle Atlantic PHBL-1 1U Flat Aluminum Blank Panel

The Middle Atlantic PHBL-1 is a 1U flat blank panel engineered for standard 19-inch equipment racks — the straightforward solution for covering unused rack openings and maintaining proper airflow management in telecom, AV, and security infrastructure enclosures. At just 0.08 inches deep and 1.75 inches tall, it slots into any open 1U bay without consuming usable depth or conflicting with adjacent equipment.

Overview

Empty rack slots are more than an aesthetic problem — they disrupt designed airflow paths, allow hot exhaust to recirculate into cold air intakes, and create security gaps in locked cabinets. The PHBL-1 addresses all three: its flush aluminum face closes the bay completely, contributing to consistent front-to-back airflow through properly managed enclosures. For integrators building out rack systems and security infrastructure, blanking panels are a standard finishing step before commissioning.

The PHBL-1 is part of Middle Atlantic's PHBL series — a rack panel family focused on functional fill solutions for professional installations. When you're sourcing components for a rack accessory kit or completing a multi-bay enclosure build, this is the panel to reach for.

Key Features

• 1U Form Factor (1.75 in. height): Fills exactly one rack unit. If you're covering two adjacent open slots, order two panels — they stack without gaps in any standard EIA-310-compliant 19-inch rack.
• 19-Inch Standard Width: Matches the universal rack equipment width, so it installs directly into any standard open-frame or enclosed rack enclosure without modification or adapters.
• Aluminum Construction: Aluminum is the correct material for a blank panel — it's light enough that it won't add meaningful weight to a panel-dense rack, and rigid enough that it won't bow or flex when mounted. Steel panels are heavier without a functional benefit for this application.
• Black Powder Coat Finish: The powder coat gives the panel a matte black surface that matches the interior of most professional rack enclosures. It resists scratches during installation and doesn't chip the way painted steel can under repeated handling.
• 0.08-Inch Depth: At under a tenth of an inch thick, the PHBL-1 adds virtually no depth to the rack face. This matters when enclosures are mounted in shallow-depth spaces or when the rack door clearance is tight.
• Rack Mount Installation: Designed for standard rack rail mounting — installs with the same screws used for your active equipment. No special hardware or tools required beyond what's already on the bench.

Integration & Compatibility

The PHBL-1 (often searched as PHBL 1) is compatible with any EIA-standard 19-inch rack — open-frame, enclosed two-post, four-post, or wall-mount enclosures. It pairs directly alongside network switches, patch panels, NVRs, and other rack-mount equipment in security and IT infrastructure builds. There are no power, data, or grounding connections — installation is mechanical only. For builds requiring multiple blank panels across several rack units, the PHBL series offers consistent finish and sizing across the line.

Frequently Asked Questions

Q: What rack unit size does the PHBL-1 fill?

A: The PHBL-1 fills exactly 1U — it is 1.75 inches tall, which is the standard height of a single rack unit in an EIA-310-compliant 19-inch rack.

Q: Is the PHBL-1 compatible with standard 19-inch racks?

A: Yes. The PHBL-1 is 19 inches wide and designed for standard rack-mount installation in any EIA-compliant 19-inch open-frame or enclosed rack enclosure.

Q: What is the PHBL-1 made of?

A: The PHBL-1 is constructed from aluminum with a black powder coat finish — lightweight, rigid, and scratch-resistant for professional rack installations.

Q: How deep is the PHBL-1?

A: The PHBL-1 is 0.08 inches deep. It adds minimal depth to the rack face, making it suitable for shallow enclosures or tight door-clearance installations.

Q: Do I need special hardware to install the PHBL-1?

A: No. The PHBL-1 mounts using standard rack screws — the same fasteners used for your other rack-mount equipment. No specialized tools or adapters are required.

Q: Can I use multiple PHBL-1 panels to cover larger openings?

A: Yes. Multiple PHBL-1 panels can be stacked to cover consecutive open rack units. Each panel covers one 1U slot; for a 2U opening, install two panels.

Eden Phillips

The PHBL-1 is a component I spec into virtually every rack build — not because it's complicated, but because skipping blanking panels is one of the most common finishing mistakes I see on commissioned security and IT racks. At 0.08 inches of depth and 1.75 inches tall, it disappears into the rack face while doing real work: closing the airflow bypass that open slots create in actively cooled enclosures.

Technical Highlights:

• Aluminum construction: Keeps panel weight negligible — relevant when you're installing a full run of blanks across 10+ empty 1U slots in a dense rack. Steel would add weight without functional benefit here.
• Black powder coat finish: Matches the interior finish of most professional Middle Atlantic enclosures, giving the rack a consistent face. The powder coat holds up to repeated install/remove cycles better than painted finishes.
• 19-inch standard width: Fits any EIA-310-compliant rack without adapters or modification — interchangeable with other vendor's blanking panels if you're completing a mixed-brand enclosure.

Deployment Considerations:

• At 0.08 inches deep, the PHBL-1 sits essentially flush with the rack rail face — verify your enclosure door has at least that much clearance, though this is virtually never an issue in practice.
• The PHBL-1 is a flat panel with no venting — if you're blanking slots in a thermally loaded enclosure that relies on managed front-to-back airflow, that's the correct choice. Do not substitute vented panels in positions where blanking is required by your thermal design.

For commercial security rack builds — NVR enclosures, patch panel rows, PoE switch bays — the PHBL-1 is the standard finishing component to specify whenever the rack layout leaves open 1U slots between active equipment.