Middle Atlantic GUARD Hamburger Style Fan Guard for 4.5 in. Fans
The Middle Atlantic GUARD is a hamburger-style wire fan guard designed to fit 4.5 in. (11.4 cm) fans in rack enclosures, equipment cabinets, and thermal management assemblies. At just 0.25 in. deep and 4.52 in. square, it adds personnel and debris protection over an exposed fan blade without meaningfully restricting airflow or adding bulk to the enclosure build. If you're finishing out a rack with open fan cutouts, the GUARD is the straightforward cover that completes the installation safely and cleanly.
Overview
Hamburger-style guards use parallel wire rows rather than a mesh grid, which means less material in the airflow path. For thermal management in populated AV racks, security NVR enclosures, or network equipment cabinets, that matters — reduced obstruction keeps fan performance close to its rated spec rather than choking it at the guard. The GUARD's 4.52 in. x 4.52 in. (11.5 cm x 11.5 cm) footprint is sized to the 4.5 in. fan standard used across Middle Atlantic rack enclosures and many third-party cabinets in the same class.
At 0.1 lbs shipping weight, this is a true add-on — you won't notice it on a fully populated rack, and it won't affect structural load calculations for wall or floor enclosures. The shallow 0.25 in. depth means it sits flush against the panel face without creating clearance conflicts with adjacent cable management or mounting hardware inside the cabinet.
Key Features
- Hamburger-style wire construction: Parallel horizontal wire rows leave more open face area than diamond or fine mesh guards — airflow restriction is minimal, so your fans deliver closer to rated CFM rather than working harder to compensate for a blocked face.
- 4.5 in. fan compatibility: Sized at 4.52 in. x 4.52 in. to seat correctly over 4.5 in. fans — the standard dimension used across rack thermal management accessories in this product class. No trimming, no adapter required.
- 0.25 in. profile depth: Shallower than most mesh guards, so it won't create a clearance conflict at the panel face. Relevant when adjacent blanks, cable rings, or patch panels are close-mounted on the same rack rail column.
- 0.1 lbs shipping weight: Negligible load contribution — useful when you're accounting for total enclosure weight in wall-mount or overhead installations where every pound counts.
- Personnel and debris protection: Covers rotating fan blades on exposed cutouts, meeting basic safety requirements for occupied equipment rooms and reducing the risk of cable or debris ingestion that can cause premature fan failure.
Integration & Compatibility
The GUARD is designed for 4.5 in. fans. Verify your fan's nominal size before ordering — 4 in. and 5 in. fans use different guard SKUs and the fit is not interchangeable. This guard is appropriate for any rack enclosure or cabinet that uses 4.5 in. panel-mounted fans, including third-party enclosures, as long as the mounting hole pattern matches Middle Atlantic's standard. The 0.25 in. depth addition is the only dimensional change to account for in tight-clearance builds.
For builds requiring active cooling across multiple rack units, pair this guard with compatible rack thermal management components — fan trays, blanking panels, and vented shelves — to complete a properly managed airflow path from intake to exhaust.
Frequently Asked Questions
Q: What fan size does the GUARD fit?
A: The GUARD is designed for 4.5 in. (11.4 cm) fans. Its outer dimensions are 4.52 in. x 4.52 in. (11.5 cm x 11.5 cm). It is not sized for 4 in. or 5 in. fans.
Q: How much depth does the GUARD add to the enclosure panel?
A: The GUARD adds 0.25 in. (0.6 cm) of depth at the fan mounting location. This is shallow enough to avoid clearance conflicts in most installations, but verify against any adjacent hardware in tight builds.
Q: What is the wire pattern on the GUARD?
A: The GUARD uses a hamburger (parallel horizontal wire row) pattern, which provides less airflow restriction than fine mesh or diamond-pattern guards, keeping fan performance close to its rated specification.
Q: Is the GUARD compatible with third-party enclosures?
A: The GUARD fits any enclosure using 4.5 in. panel fans, provided the mounting hole pattern is compatible with Middle Atlantic's standard. Confirm your enclosure's fan cutout dimensions before ordering.
Q: How much does the GUARD weigh?
A: Shipping weight is 0.1 lbs (0.1 kg), making it negligible in total enclosure load calculations.
The Middle Atlantic GUARD comes up most often when an integrator is finishing a rack build and realizes the open fan cutouts are a liability — fingers, loose cable ends, or debris can reach spinning blades in an occupied equipment room. At 0.25 in. deep and 4.52 in. square, the GUARD covers that exposure without adding measurable depth or airflow restriction to the assembly.
Technical Highlights:
- Hamburger-style wire pattern: Parallel wire rows maximize open face area compared to mesh guards — fan CFM stays close to rated output rather than being throttled at the guard face, which matters in a densely loaded rack where every degree of cooling counts.
- 4.52 in. x 4.52 in. footprint: Seats flush over the 4.5 in. fan standard with no trimming. Mismatching to a 4 in. or 5 in. fan will result in improper seating — confirm fan nominal size before specifying.
- 0.25 in. depth: The shallowest profile available for this fan class — relevant when blanking panels, cable rings, or patch panels are mounted adjacent to the fan position and clearance is already tight.
Deployment Considerations:
- Verify mounting hole pattern compatibility before ordering for third-party enclosures — the GUARD is designed to Middle Atlantic's standard, and hole spacing on off-brand cabinets can vary enough to prevent proper attachment.
- The 0.1 lb weight is genuinely negligible, but if you're populating multiple fan positions in a wall-mount enclosure with a tight structural load ceiling, accounting for each guard in your total weight calculation is still good practice.
The GUARD is the right finish component for security integrators and AV technicians closing out rack builds in occupied spaces — server rooms, NOCs, or classroom AV closets — where exposed fan blades represent both a safety and a reliability risk.
