Vertiv GL1300MMR 1300 BTU Enclosure Air Conditioning Unit

Overview

The Vertiv GL1300MMR is a compact enclosure air conditioning unit rated at 1300 BTU, designed to maintain safe operating temperatures inside sealed electrical and network enclosures. Running on 120V/60Hz at 3.1 amps, it fits standard North American branch circuits without requiring dedicated high-amperage drops — a practical advantage when retrofitting thermal management into existing infrastructure rooms, remote telecom closets, or outdoor equipment enclosures where available power is limited.

Enclosure cooling is one of the most overlooked variables in field deployments. Switching gear, PoE injectors, fiber converters, and access control panels all generate heat in confined spaces. When ambient temperatures climb or ventilation is inadequate, hardware reliability drops and failure rates rise. The GL1300MMR addresses this directly by providing active refrigeration — not just circulation — inside the enclosure cabinet.

Key Features

• 1300 BTU Cooling Capacity: Sized for small-to-mid enclosures housing networking gear, access control hardware, or telecom equipment. 1300 BTU removes heat aggressively enough to maintain safe component temperatures in ambient conditions that passive ventilation cannot handle — particularly relevant for outdoor or sun-exposed cabinets.
• 120V/60Hz Operation: Operates on standard North American single-phase power, eliminating the need for step-down transformers or dedicated 240V circuits. Plug into any properly protected 15A or 20A branch circuit and the unit is ready to commission.
• 3.1 Amp Draw: At 3.1A continuous, the GL1300MMR stays well within the 80% loading rule on a 15A circuit even when sharing a circuit with control hardware. This low draw means thermal management does not meaningfully consume your available panel capacity.
• Active Refrigeration: Unlike thermostat-controlled fans or passive heat exchangers, an active AC unit maintains a target temperature setpoint regardless of external ambient spikes — critical for outdoor enclosures in warm climates or sun-exposed installations where passive solutions fall short.
• Compact Form Factor for Enclosure Mounting: Designed to mount directly to an enclosure panel or door cutout, keeping the footprint inside the cabinet minimal and preserving rack unit space for active equipment.
• Vertiv Thermal Management Lineage: Part of the Vertiv thermal and power management catalog, which spans data center precision cooling down to enclosure-level units — giving integrators a consistent vendor relationship from edge to core.

Integration & Compatibility

The GL1300MMR is intended for use with sealed or semi-sealed enclosures where heat buildup from internal equipment cannot be adequately managed through passive ventilation or fan-only solutions. Typical deployment targets include network infrastructure enclosures, outdoor telecom cabinets, industrial control panels, and security system enclosures housing NVRs, access control panels, or PoE switches in environments with high ambient temperatures.

Before specifying this unit, confirm the enclosure volume and the total heat load (in BTU/hr or watts) generated by installed equipment. As a general reference, 1 watt of heat dissipation equals approximately 3.41 BTU/hr. A cabinet housing 200W of active gear generates roughly 682 BTU/hr of heat — well within the GL1300MMR's 1300 BTU capacity, leaving margin for ambient thermal load through the enclosure walls. For larger enclosures or higher heat-load scenarios, evaluate higher-capacity units in the Vertiv enclosure cooling line before committing to this model.

Electrical integration is straightforward: the unit requires a 120V/60Hz feed with appropriate overcurrent protection. Confirm that the enclosure cutout dimensions match the GL1300MMR's mounting footprint before ordering — Vertiv publishes dimensional drawings for enclosure fit verification. Pair with a managed PoE switch or access control panel inside the enclosure to ensure the protected equipment operates within its rated temperature range year-round.

Frequently Asked Questions

Q: What size enclosure is the GL1300MMR designed to cool?

A: The GL1300MMR is rated at 1300 BTU and is appropriate for small-to-medium sealed enclosures. The correct sizing depends on your enclosure's total internal heat load (sum of all equipment watt dissipation, converted to BTU/hr at ~3.41 BTU per watt) plus the ambient thermal load through enclosure walls. For equipment generating up to roughly 300–350W of heat, the GL1300MMR provides adequate cooling margin in most installations.

Q: What power supply does the GL1300MMR require?

A: The GL1300MMR operates on 120V/60Hz AC power and draws 3.1 amps. A standard 15A or 20A North American branch circuit with proper overcurrent protection is sufficient. No step-down transformer or special wiring is required.

Q: Is the GL1300MMR suitable for outdoor enclosures?

A: The GL1300MMR provides active refrigeration rather than passive ventilation, making it a practical option for outdoor or sun-exposed cabinets where ambient temperatures can spike well above equipment-rated maximums. Verify that the enclosure itself has an appropriate IP rating for the outdoor environment — the AC unit manages internal temperature but does not seal the enclosure against moisture or dust ingress.

Q: Can the GL1300MMR share a circuit with other equipment?

A: At 3.1A continuous draw, the GL1300MMR can share a 15A branch circuit with other low-draw control hardware while remaining within the 80% continuous-load rule (12A on a 15A circuit). However, always calculate total circuit loading including startup inrush before sharing circuits with other motorized or compressor-driven loads.

Q: Where does the GL1300MMR fit within the Vertiv enclosure cooling product family?

A: The GL1300MMR sits at the lower end of Vertiv's enclosure air conditioner range, targeting small enclosures with moderate heat loads. For larger cabinets or higher-wattage equipment, Vertiv offers higher-BTU models in the same enclosure AC series. Confirm your heat load calculation before selecting between models.

Ted Perry

The GL1300MMR is the unit I reach for when a sealed telecom or security enclosure is running hot and passive options have already been ruled out. At 1300 BTU on a 120V/3.1A feed, it handles the thermal load of a typical small cabinet — think a PoE switch, a couple of access control panels, and a small NVR — without requiring any infrastructure changes beyond a standard 15A circuit.

Technical Highlights:

• 1300 BTU Cooling Capacity: Translates to roughly 381 watts of heat removal — enough headroom to protect a cabinet running 200–250W of continuous equipment load while still absorbing ambient conduction through the enclosure walls.
• 3.1A Current Draw: Leaves the better part of a 15A circuit available for control hardware. On a 20A circuit, sharing with a UPS or power distribution unit is straightforward without approaching the 80% loading threshold.
• 120V/60Hz Compatibility: No special power provisioning needed. Commission directly from a standard North American branch circuit — useful in retrofit scenarios where running new high-voltage drops is not an option.

Deployment Considerations:

• Always verify the enclosure cutout dimensions against Vertiv's published dimensional drawing for the GL1300MMR before mounting — this is a cutout-mount unit and field-modifying an enclosure panel after the fact is costly.
• Active AC units have compressors with startup inrush current. If the GL1300MMR will share a circuit, confirm the breaker and wiring can handle momentary inrush — not just the 3.1A steady-state draw — before energizing.

This unit is a strong fit for outdoor security enclosures in warm-climate deployments — specifically cabinets housing surveillance NVRs, PoE switches, or access control hardware in environments where summer ambient temperatures regularly exceed what passive ventilation can manage.