Top 10 Thermal Management Product FAQ’s

Enclosure cooling

Axair Online Thermal ManagementThis year we launched our eCommerce website AxairOnline; making it simple and easy to purchase thermal management products for effective enclosure cooling and climate control within electrical cabinets. From our experience, we’ve noticed a set of common questions from our customers so this week we look at the top ten questions about the Fandis range of thermal management products:

How does a fan filter work to facilitate thermal cooling?

A fan filter is used to dissipate thermal heat within an enclosure or cabinet and thus prevent the premature failure of the equipment inside it.

The most common method is to pull the warm air out (reverse flow) near the top using a fan filter while cooler air is drawn in through a stand alone filter at the bottom of the cabinet. Both fan filter and filter provide protection to IP54 and prevent the ingress of dust and water splashes. Increased protection can be specified to IP55 if needed on most of the range. Where space is limited within an enclosure, a spacer can be used. You can view our range of Fan Filter units here

Can I buy a filter unit without a fan?

Yes, all items are available on our eCommerce website as separate purchases.

What bearings are used within your filter units?

Our fan filter units are manufactured using ball bearings. Ball bearings are superior to sleeve bearings increasing the life of the product. For more information, visit our Knowledge Zone.

What is the difference between Standard and Reverse airflow?

Our Fan Filter Units are available in either ‘reverse’ or ‘standard’ airflow.  The reverse is by far the more popular choice therefore standard airflow is only supplied upon request. (Contact us if you wish to order a Fan Filter in standard airflow).

The dimensions are the same and both types need either an inlet filter or outlet filter depending on the airflow direction chosen.

The difference is how the air is forced out of the enclosure:

–          Reverse airflow :

The preferred method is to situate the fan filter at the top and the filter at the bottom. Warm air rises so the fan forces the hot air out of the cabinet while the filter intakes cool air from the environment at the bottom. The airflow is more even throughout the enclosure because of constant negative pressure and there is less turbulence and more consistent pressure. All fan filters sold by AxairOnline are configured for this airflow.

–          Standard airflow :

Alternatively the fan filter can be mounted at the bottom of the cabinet and the filter at the top. This airflow direction is known as standard flow. The fan forces cool air into the cabinet while the filter ejects hot air to the environment. This has the benefit of positive pressure which helps expel dust from any gaps within the cabinet. To operate your fan filter in this airflow direction you will need to change the direction of the fan. You can request this of Axair Online at the time of ordering if required.

You can learn how to manually change the direction of the airflow here

On what occasion would I use a roof fan?

Where a cabinet or enclosure does not have the space to include multiple filters on the side walls or air needs to be ejected through the top of the cabinet then a roof unit can be used.


What does an adaptor do?

An adapter can be used during the installation of a fan filter unit within a cabinet or enclosure where space is limite. The adaptor is an accessory that can be easily integrated into the FPF fan filter assembly where internal space is at a premium. This can be used to fit fan filters FPF12, FPF15 annd FPF20.

Adaptors allow the fan/filters to sit from 23-26mm outside of the cabinet or enclosure. This will provide extra internal space for when the density of components within the cabinet is high and little room is available for a fan filter.

What type of filter media is provided?

A G3 filter media is a thermal management product supplied with all fan filter units and on replacement media. This is a thicker composition which enables more effective filter of dust and liquid ingress giving the fan filter units an IP rating of IP54. Many manufacturers use a G2 filter media giving the unit a lower level of dust and liquid ingress protection.

How many times can I wash the filter media before it needs replacing?

Our fan filter media is a G3 composition, making it a superior product for use within the filter unit. The media can be maintained by washing, blow drying and lightly beating. This can be done ten times before the media needs replacing,

What is the difference between a normally open and normally closed thermostat?

A Normally Closed (NC) red thermostat has closed contacts when the temperature is below the set value and opens with rising temperatures. A NC thermostat can be used alongside a heater or for switching alarm signal devices when the temperature drops below a certain value.

A Normally Open (NO) blue thermostat has open contacts when the temperature is below a set value and closes with rising temperatures. A NO thermostat can be used when using a fan to remove heat or for a temperature alarm when heat rises above a certain value.

How do heaters work and do I need one?

Heaters are used where damage from condensation must be prevented, or where the temperature must not fall below a minimum value. A drop in temperature can lead to a serious malfunction or to component failure. Convection heaters protect against low temperatures preventing the formation of condensation.

Heaters work using Self-regulating Positive Temperature Coefficient (PTC) thermistors. So as the temperature rises the resistance increases and less power is used. The reverse is true when the temperature drops.


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