EMERSON NFT-801RM3-S — Rack-Mount Fan Tray for 19-inch Cabinets

The EMERSON NFT-801RM3-S is a compact, rack-mount fan tray designed to move heat out of dense 19-inch equipment cabinets. From my experience, the “RM3” format fits a 3U space and the “-S” variant typically adds thermostatic or speed-controlled operation, which helps balance cooling performance with noise and power draw. If you’ve got top-of-rack switches or a patching zone that runs warm, this kind of fan unit is a simple, reliable way to stabilize temperatures without jumping straight to an in-cabinet active cooling solution.

Company’s Order Placement Process and Guarantees

• Warranty: 365 days
• Delivery time: 1 week for in-stock items; no more than one month at the latest
• Payment: 50% advance payment, full payment before delivery
• Express delivery: FedEx, UPS, DHL

Key Features

• 3U rack-mount footprint – Slides into standard 19-inch EIA racks without eating too much vertical space.
• Multi-fan 80 mm array – Uses multiple 80 mm axial fans for even airflow across the rack width; you might notice more uniform cooling across switch stacks.
• Speed/thermostatic control (S variant) – The “-S” version is typically supplied with variable-speed logic or a thermal sensor, so fans ramp up when heat builds and quiet down when not needed.
• Simple power-in, minimal wiring – Designed for quick drop-in use; installers usually appreciate the straightforward cabling and clear labeling.
• Dry-contact alarm (in many cases) – Many builds provide a relay alarm output so you can forward a fan fault to your PDU or monitoring system.
• Front or top-of-cabinet airflow support – Commonly used at the top of a rack to extract hot air, or mid-rack to assist side-vented gear.
• Durable metal chassis – Rigid frame resists cabinet vibration and daily service activity.

Technical Specifications

One thing I appreciate is how forgiving these units are when retrofitting older racks. A network team we support dropped an NFT-801RM3-S at the top of a mixed vendor cabinet and saw switch inlet temperatures fall by about 8–10 °C during afternoon peaks—no change to the room set-point.

Related or Supporting Products

• EMERSON/Vertiv fan tray variants: NFT-801RM3 (fixed-speed), NFT-1201RM3-S (120 mm fan version for higher airflow with lower RPM)
• Vertiv Liebert rack PDUs (e.g., MPH2/MPI) – Pair with the fan tray for power metering and alarm pass-through
• Rack thermostats/thermal probes – For temperature-driven fan speed control and cabinet alarm thresholds
• 19-inch cabinet accessories – Brush panels and blanking plates to prevent hot air recirculation

Installation & Maintenance

• Mounting – Install in a 3U position per EIA-310 hole pattern. Keep at least 1U of free space above a top-extraction setup to avoid blockage.
• Airflow direction – Decide on intake vs. exhaust orientation before wiring. In most cases, top-of-rack exhaust improves stack cooling.
• Wiring – Use a dedicated, protected AC feed. If a dry-contact alarm is provided, land it on a monitored PDU or BMS input.
• Ventilation – Avoid obstructing perforated doors and ensure cable bundles don’t block the fan inlets.
• Safety – Isolate power before servicing; fans may spin unexpectedly on temperature rise.
• Routine care – Quarterly dust cleaning on grills and filters (if present). Check fan bearings/noise and verify alarm contact operation.
• Firmware/settings – If the “-S” unit provides configurable thresholds, validate setpoints during commissioning and after seasonal changes.

Quality & Certifications

• Conformity: CE and RoHS compliant in typical markets
• Safety: UL/CSA assessed variants commonly available depending on region
• Manufacturer’s coverage: Standard 12-month warranty; our supply warranty is 365 days

If you’re shortlisting a quick, low-touch way to stabilize cabinet temperatures, the EMERSON NFT-801RM3-S seems to be a strong, low-risk choice. And if airflow targets or power format differ site-to-site, we can match the variant and alarm wiring to your cabinet standard after a brief checklist.