Middle Atlantic 1 Unit Width Half Rack Blank Panel - HRBL1

Middle Atlantic HRBL1 1U Half-Rack Blank Panel

Overview

The Middle Atlantic HRBL1 is a 1U aluminum blank panel sized for half-rack enclosures — the right tool for filling unused bays in any half-rack AV, security, or network deployment without resorting to foam inserts or improvised covers. At 10.4 inches wide and just 0.51 inches deep, it closes off open spaces in a finished, professional manner while keeping airflow predictable through the rest of the rack. If you're commissioning a half-rack enclosure with empty slots above or below active equipment, the HRBL1 is the clean solution.

Half-rack blanks are often treated as an afterthought, but open bays in active enclosures create real problems: unmanaged airflow bypasses heat-producing equipment, rack interiors collect dust faster, and finished installations look incomplete at client handoff. The HRBL1 addresses all three with a purpose-made panel rather than a workaround.

Key Features

• 1 Rack Unit height (1.75 in): Fills a single open bay precisely — no trimming, no shimming. At 1.75 inches tall, it matches the standard 1U slot geometry, so the panel sits flush against adjacent rack gear without gaps or overhangs.
• Half-rack width at 10.4 in (26.4 cm): Designed specifically for half-rack enclosures, not full 19-inch racks. If you're working with rack accessories and half-rack chassis from Middle Atlantic or similar, this panel drops in without modification.
• Aluminum construction: Lighter than steel blanks and corrosion-resistant — relevant in equipment rooms where humidity varies. The material stays dimensionally stable over time, so the panel won't bow or bind in the rails years after install.
• Flat black powder coat finish: Matches standard rack interior aesthetics. Powder coat holds up better than paint in enclosures where panels get handled during maintenance — no chipping on the edges when you pull adjacent equipment.
• Flanged style with 2 mounting points: The flanged design means the panel registers against the rack rail face for a flush fit, and 2 mounting points keep it secured without over-constraining a thin panel. Standard rack screws apply — no special hardware needed.
• 0.51-inch depth: At just over half an inch deep, this panel doesn't intrude into the usable interior depth of the enclosure. Cable runs, power strips, and rear-mounted equipment behind the panel plane are unaffected.
• 0.3 lb shipping weight: Ships light; stocking a handful for future expansion adds negligible weight to any rack accessory order. Worth ordering a few extra if you're building out a multi-enclosure deployment — open bays always appear at the wrong time.

Integration & Compatibility

The HRBL1 is purpose-built for Middle Atlantic half-rack enclosures and is compatible with any half-rack chassis that accepts standard 10.4-inch-wide 1U panels. It pairs naturally with Middle Atlantic rack enclosures and accessories but will also fit third-party half-rack frames sharing the same bay geometry. If you're specifying a rack enclosure for a security or AV head-end and need to fill unused 1U half-rack slots, verify your enclosure's panel width spec against the 10.4-inch dimension before ordering full quantities.

For deployments that also require rack-mounted power distribution or patch panels in the same enclosure, the HRBL1 fills the gaps between active components without requiring any modification to existing rail hardware. The flat powder coat finish blends with most black-interior enclosures from major manufacturers.

What's in the Box

• 1x Middle Atlantic HRBL1 half-rack blank panel

Frequently Asked Questions

Q: What rack enclosure width is the HRBL1 designed for?

A: The HRBL1 is designed for half-rack enclosures. Its panel width is 10.4 inches (26.4 cm), which is the standard half-rack bay width — not a full 19-inch rack. Verify your enclosure accepts 10.4-inch panels before ordering.

Q: How many rack units does the HRBL1 occupy?

A: The HRBL1 fills exactly 1 rack unit (1.75 inches tall). It closes off a single 1U bay in a half-rack enclosure.

Q: What material and finish is the HRBL1?

A: The HRBL1 is aluminum with a flat black powder coat finish. The powder coat is more durable than paint and resists chipping during routine maintenance access.

Q: Does the HRBL1 include mounting screws?

A: The package contains 1 panel. Mounting hardware (rack screws) is not listed in the verified package contents — use standard rack screws appropriate for your enclosure's rail type.

Q: How deep is the HRBL1 — will it interfere with rear-mounted equipment?

A: The HRBL1 is only 0.51 inches (1.3 cm) deep, so it sits almost entirely at the rack face and does not extend into the usable interior depth of the enclosure.

Q: How many mounting points does the HRBL1 have?

A: The HRBL1 has 2 mounting points — one on each flange — which is standard for a 1U panel and sufficient to keep it secure without over-constraining the aluminum.

Marty Allison

The HRBL1 is the kind of component that gets forgotten until the day of commissioning — and then you're scrambling. I specify these at the same time as the enclosure. At 10.4 inches wide and exactly 1.75 inches tall, it drops into a half-rack 1U bay with no adjustment needed. Flat black powder coat means it won't look out of place next to anodized or painted rack gear, and the aluminum construction keeps the weight negligible at 0.3 lbs shipping.

Technical Highlights:

• Flanged Style: The flanged design registers against the rail face for a flush mount — no gap between the panel face and adjacent equipment. Two mounting points hold it stable without stressing the thin aluminum.
• 0.51-inch Depth: This panel barely extends past the rail plane, which matters in compact half-rack enclosures where rear cable management is tight. You won't lose usable depth behind the panel.
• Aluminum + Powder Coat: Aluminum stays corrosion-free in variable-humidity equipment rooms; powder coat holds its finish through the repeated access typical in active security head-end racks.

Deployment Considerations:

• Confirm your half-rack enclosure accepts 10.4-inch panels before ordering in bulk — some third-party half-rack frames use non-standard widths. The HRBL1 is spec'd to Middle Atlantic's half-rack geometry.
• Mounting screws are not included in the verified package contents — have your standard rack hardware on hand at install time.

Best fit: security head-end closets using Middle Atlantic half-rack enclosures where NVRs, power supplies, or managed switches leave open 1U bays that need to be closed for airflow management and a finished client handoff.