Exhaust filter
Exhaust filters for control cabinets – clean exhaust air and reliable protection
Effective control cabinet ventilation only works if the supply air and exhaust air are optimally regulated. Outlet filters for control cabinets ensure that heated air can escape in a controlled manner while keeping dust, dirt, and moisture out.
This allows you to reliably protect sensitive electronics, prevent heat build-up, and extend the service life of your systems.
Function and use of exhaust filters in control cabinets
An electrical cabinet exhaust filter is the counterpart to the filter fan: while the filter fan draws cool outside air into the electrical cabinet, the exhaust filter directs the heated air outside after filtering it.
This targeted air flow creates constant temperature management that effectively protects electronic components.
Areas of application:
Exhaust filters are used wherever dust, dirt, or moisture could jeopardize the function of electronics – e.g., in
- mechanical engineering and automation,
- switching and control technology,
- building services engineering and energy distribution.
In combination with a suitable filter fan, outlet filters create efficient and energy-saving air circulation in the control cabinet – the basis for long-term trouble-free operation.
Installation and maintenance of outlet filters
Regular replacement of the filter mat is crucial to ensure that exhaust filters remain effective in the long term.
A high-quality filter mat for exhaust filters reliably retains dust particles and can be replaced quickly and without tools. This keeps the filter performance consistently high and maintenance particularly easy.
Our outlet filters are available in high protection classes (IP54) and are made of robust, durable materials – ideal for continuous industrial use.
Large selection of outlet filters for control cabinets
Terms such as exhaust air filter, outlet filter, or switch cabinet outlet filter are often used synonymously – technically, they refer to the same component: a filter that is mounted at the outlet opening of the enclosure to ensure clean exhaust air.
At Lm-therm, you will find a wide selection of outlet filters for switch cabinets in various sizes, designs, and performance classes.
Whether you need a compact outlet filter for small enclosures or for demanding industrial environments, all models are designed to meet the highest standards.
- Easy installation
- High filter performance
- Durable materials
- Easy filter replacement
With the right exhaust filters and filter mats, you can protect your electronics in the long term, optimize air circulation in the control cabinet, and ensure efficient heat dissipation.
Discover our high-quality outlet filters, exhaust air filters, and filter mats for control cabinets now.
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Frequently Asked Questions
What is an exhaust filter for control cabinets?
An exhaust filter is the exhaust component of a control cabinet ventilation system: It is located at the top of the control cabinet and allows the air heated by the filter fan to escape to the outside. At the same time, its filter medium prevents dust, insects, or other particles from entering the cabinet from the outside through the exhaust opening.
What is the difference between an exhaust filter and an exhaust fan?
An exhaust filter is a purely passive component. It does not contain a fan, but allows the warm air to escape solely through natural convection or the pressure difference created by the filter fan on the opposite side. An exhaust fan, on the other hand, is an active device with its own fan that actively extracts the warm air from the cabinet—for higher air volumes or larger control cabinets with higher power dissipation.
Is an exhaust filter always required in conjunction with a filter fan?
Yes, exhaust filters and filter fans always form a system. The control cabinet filter fan blows cool fresh air into the lower part of the cabinet, while the exhaust filter vents the heated air from the upper part to the outside. Without a suitable control cabinet exhaust filter, the warm air accumulates inside the cabinet and the cooling effect of the ventilation is virtually eliminated.
Where is the exhaust filter mounted on the control cabinet?
The exhaust filter is mounted in the upper section of the control cabinet—where warm air naturally collects inside the cabinet, since warm air rises. The filter fan is located opposite it in the lower section, creating a uniform airflow from bottom to top throughout the entire cabinet.
What sizes are available for control cabinet exhaust filters?
Exhaust filters are available in the same standardized cutout dimensions as filter fans—ranging from compact sizes for small control enclosures to larger models for industrial control cabinets. Important: The exhaust filter should match the size and airflow rate of the control cabinet filter fan being used to ensure optimal airflow.
How often does the control cabinet air filter of the outlet filter need to be cleaned?
The filter element of the control cabinet outlet filter should also be checked regularly for contamination—monthly in dusty environments, and every six months in clean areas. A clogged filter on the control cabinet side of the exhaust air increases flow resistance and significantly reduces the total air volume of the control cabinet ventilation.
Can the filter insert of the outlet filter be replaced?
Yes, the filter mats of the Lm-therm outlet filters can be easily replaced without tools. Replacement filter mats are available separately as accessories. It is recommended to replace the filter fan and outlet filter
Can I operate an exhaust filter without an active filter fan?
Yes, in small control cabinets with low power dissipation, an exhaust filter can also be used in combination with a simple supply air grille (without a fan) if natural convection is sufficient. For most industrial applications, however, we recommend using an active industrial filter fan to ensure a defined and sufficient airflow.