Middle Atlantic Integrated 4 1/2in. Fan Top Includes 3 Fans 285 CFM Fits Any WMRK - ERK-4FT-285CFM

Middle Atlantic ERK-4FT-285CFM Integrated 4.5-Inch Fan Top for ERK, WMRK, and SCRK Racks

The Middle Atlantic ERK-4FT-285CFM is an active fan top designed to move 285 CFM of air through full-depth rack enclosures where passive ventilation falls short. Three 4-inch AC fans pull heat out of the top of the cabinet — the right solution when you're stacking dense AV or security equipment that generates sustained thermal load and needs more than a vented lid to stay within operating temperature. At 120 VAC, it wires directly into the rack's power strip without any external controller or special cabling.

Overview

Fan tops earn their place in racks where equipment density is high and the room's ambient cooling can't keep up on its own. The ERK-4FT-285CFM mounts to any WMRK, ERK, or SCRK enclosure from Middle Atlantic, making it a straightforward add-on for integrators already working in that rack family. The unit is classified as an active, uncontrolled component — the fans run continuously at full speed, which is a deliberate design choice for environments where consistent airflow matters more than noise attenuation. No fan controller is included or required for the base configuration.

Key Features

• 285 CFM Total Airflow: Three fans collectively move 285 cubic feet of air per minute through the top of the enclosure. For a standard 12U–16U security or AV rack loaded with NVRs, switches, and amplifiers, that's enough throughput to prevent thermal accumulation during sustained operation — a real factor in wiring closets with poor room conditioning.
• Three 4-Inch Fan Array: Rather than a single large fan, three 4-inch (10.16 cm) units distribute airflow across the full width of the top panel. Even airflow distribution prevents hot spots over individual components, which matters most when NVR storage drives are positioned near the top of the cabinet.
• 120 VAC Operation: Runs on standard AC mains voltage, so it connects directly to any rack-mounted power strip or PDU without a DC transformer or voltage converter. No additional power hardware to source or mount.
• Active (Uncontrolled) Design: Fans run at full speed continuously — no speed controller, no thermostat. This means consistent, predictable airflow with no controller component to fail or misconfigure. If you need variable speed or temperature-triggered operation, that requires a separate fan controller accessory (not included).
• Fits WMRK, ERK, and SCRK Enclosures: Compatibility is explicit across Middle Atlantic's wall-mount rack (WMRK), equipment rack (ERK), and studio/credenza rack (SCRK) lines. Drop-in installation — no drilling or custom fabrication.
• Compact 1.5-Inch Profile: At only 1.5 inches deep (3.8 cm), the fan top adds minimal height to the enclosure footprint. It doesn't consume rack space inside the cabinet — it sits above the top panel, preserving every U of mounting real estate for equipment.
• 19.75 × 14.38 Inch Footprint: Width of 19.75 inches (50.2 cm) and height of 14.38 inches (36.5 cm) align with standard 19-inch rack geometry. Fits directly without adapter panels or spacers.
• AC Power Type: The AC power input eliminates the need for an onboard DC power supply, which reduces internal heat generation from the fan top itself — a minor but real efficiency point in thermally constrained enclosures.

Integration and Compatibility

The ERK-4FT-285CFM is designed for the Middle Atlantic Middle Atlantic rack and enclosure catalog — specifically the WMRK, ERK, and SCRK enclosure families. If you're specifying a new rack build or retrofitting an existing one, confirm your enclosure series matches one of those three before ordering. This unit is not rated for international voltage (not available internationally), so installations outside North America on 230 VAC infrastructure will need a different solution.

For integrators managing rack thermal management accessories, this fan top pairs naturally with blanking panels to direct airflow efficiently — open U spaces allow recirculation that reduces the effective CFM reaching components. A fully blanked rack maximizes the value of the 285 CFM this unit delivers.

If your deployment includes a high-density NVR stack or a network video recorder array running 24/7, sustained thermal output from spinning drives and active processing makes active ventilation like this a practical requirement rather than an optional upgrade. Similarly, PoE switches and managed network gear in the same cabinet generate meaningful heat under continuous load.

For projects where noise level or energy consumption is a concern, review the rack cooling options in the broader Middle Atlantic line — variable-speed fan tops with thermostat controllers are available in the same enclosure families for environments where fan noise is a constraint (server rooms adjacent to open office areas, for example).

Frequently Asked Questions

Q: Does the ERK-4FT-285CFM include a fan speed controller?

A: No. This is an uncontrolled active fan top — the three fans run continuously at full speed. No fan controller is included. A separate fan controller accessory is required if you need variable speed or temperature-triggered operation.

Q: What rack enclosures is the ERK-4FT-285CFM compatible with?

A: It is designed to fit Middle Atlantic WMRK (wall-mount rack), ERK (equipment rack), and SCRK (studio/credenza rack) enclosures. Confirm your enclosure series before ordering.

Q: What power supply does the ERK-4FT-285CFM require?

A: It runs on 120 VAC — standard North American mains voltage. Connect directly to any rack-mounted PDU or power strip. This unit is not rated for international use.

Q: How much rack space does the ERK-4FT-285CFM consume?

A: None — the fan top mounts above the rack's top panel and has a profile of only 1.5 inches (3.8 cm). It does not occupy any internal rack U space.

Q: What is the total airflow output of the ERK-4FT-285CFM?

A: 285 CFM total across three 4-inch fans. This is sufficient for densely loaded AV or security racks in environments with moderate ambient cooling.

Q: What is the warranty on the ERK-4FT-285CFM?

A: Middle Atlantic provides a 3-year manufacturer warranty on the ERK-4FT-285CFM.