ClosetAir™ Small Room Cooling

ClosetAir™ Small Room Cooling

Intelligent heat removal and monitoring solution for servers, network switches and phone systems in small spaces.



The ClosetAir system removes hot air and sends it to the outside corridor or ceiling plenum return, providing control and monitoring via a built-in web server. The web pages, including graphs, are generated by the unit to track settings and environmental conditions within the room.

The ClosetAir is a complete management system that provides remote visibility of your room environment. This system is ideal for mounting on the wall or ceiling and provides automated heat exhaust while intelligently monitoring your equipment.  Receive alert notifications if critical values fall outside the user-defined threshold. 

The ClosetAir system includes one internal temperature sensor, two external temperature sensors, and two additional ports to add extra external temperature sensors (optional). 

Special Features

Active Airflow Control

Use the out-of-box setting or set your desired temperature to maintain control within the IT space.

No Reconfiguration Required

The system comes pre-programmed and requires no initial programming for standard operation.  Modifications to factory settings are very simple and can be performed with any machine that has a hardwire network port and a web browser.

Simple to Install

ClosetAir can be mounted on the wall or ceiling.  Installation time is typically less than one hour.

Temperature Monitoring

The unit is not just an intelligent fan, it is also an environmental monitoring system, with the ability to set alarm levels and email alerts.  The ClosetAir includes two temperature sensors with 20ft (6,096mm) cords with the ability to attach four total temperature sensors.  This allows you to cool and monitor your room using one device.

Monitor Multiple Closets

Racknet (sold separately) aggregates hundreds of ClosetAir units into a single pane for a complete visualization of all your closets.  Racknet provides flexibility for individual naming and reporting.

Thermal Control and Monitoring Interface

Automatic temperature control allows you to monitor and adjust settings from anywhere.  ClosetAir is an intelligent heat removal system, ideal for 0-10kW, for computer and network systems in small spaces.

Versatile and Portable, Not Just for the Closets

ClosetAir is easy to install, but also easy to move.  ClosetAir is an ideal solution for data center white spaces where high density racks have outgrown the local cooling capacity.  Use the system to quickly address hot spots where containment systems are not present.

Spec Sheet  
ClosetAir Spec Sheet Download


User Manual  
ClosetAir Instruction Manual Download


Supporting Documents  
SNCC Case Study Download
CLC Case Study Download



Cool Firmware

Call 1.800.432.3219 if you have questions about the firmware for Geist cooling products.

ActiveAir Firmware

ActiveAir Firmware
ActiveAir Firmware

Firmware for all Geist ActiveAir devices

Version: 3.16.4
Release Date: 11/28/16

Bug Fixes:

  • Fixed issue with email alerts not sending when SSL/TLS connections are required.
  • Fixed issue where the MAC address was not reporting on standard OID.

Change log

ClosetAir Firmware

ClosetAir Firmware
ClosetAir Firmware

Firmware for all Geist ClosetAir devices

Version: 3.16.4
Release Date: 11/28/16

Bug Fixes:

  • Fixed issue with email alerts not sending when SSL/TLS connections are required.
  • Fixed issue where the MAC address was not reporting on standard OID.

Change log

Legacy Updates

Legacy Updates
Legacy Updates

Legacy download for Geist Automated Smart Updater (ASU). 

Click Here to Download Geist ASU v1.20.0.5

  • Supports Geist Upgradeable, WD15, and WD100 v3.3.2 firmware.

Geist's FAQ section aims to answer specific questions related to this product offering. If you need further support, please contact Tech Support directly.

ClosetAir™ Small Room Cooling FAQs

How much load can one unit handle?

The units are rated at 1100 CFM.  Typically IT equipment requires 110 CFM of air per Kilowatt of load.  If cabinet exhaust is properly sectioned off, IT loads in the range of 10 kW can be serviced.

How is the unit mounted in the ceiling?

The ClosetAir system is designed to drop into a standard 24” x 24” ceiling tile opening.  The unit utilizes tabs for attaching hanger wire for support.

Do I need a licensed tradesman to install this unit?

Not in most cases. Since the unit is designed to be powered by a standard wall outlet and does not require changes to the cooling system, installation is very simple.  However, it is always best to check with local codes to be safe.

Does the system work in a low density environment?

Yes, the fans will respond to the conditions of the room and fluctuate in speed. It is recommended that temperature sensors be placed on the intake of the server racks. When conditions reach a predefined point the fans will adjust accordingly.

Is the system networkable?

Yes, the unit is fully configurable over the network.  Temperature set-points, alarms, email alerts, current and historic conditions can be accessed through the web interface.

Is the system compatible with my DCIM package?

Yes, the ClosetAir system is capable of sending SNMP traps and can be pulled using the included MIB file for setup.

Is it possible to channel the exhaust heat to a return duct?

Yes, the unit can be purchased with an optional round duct adapter that can connect with rigid or flexible ducting.

Is it a requirement to control speed based on temperatures?

No, the web interface also allows users to set fan speed to a constant fan speed.

Is the ClosetAir system capable of working outdoors?

The unit is designed for indoor use only.

Is the system compatible with my email server?

The ClosetAir system will work with POP3/SMTP, email relay/no authentication, ESMTP/TLS/SSL email set ups.