WHY ARE ONLY G3 OR G4 FILTERS AVAILABLE FOR SOME OLDER VENTILATION SYSTEMS?
Learn why older ventilation systems are often only suitable for G3 or G4 filters and why finer filters or an extra filter box are usually not recommended.
Why are only G3 or G4 filters available for some older ventilation systems?
For some ventilation systems, especially older units, only G3 or G4 filters are available. Many people wonder why finer filters, such as F7 filters, are not offered for these systems. In most cases, this has everything to do with the technical design of the unit itself.
Older systems are designed for low resistance
Many older ventilation units were developed for filters with relatively low airflow resistance. A G3 or G4 filter allows air to pass through more easily than a finer filter with a higher filtration grade. At the time, this was a logical choice because the motors and fans in older systems were designed for this lower resistance.
A finer filter, such as an F7 filter, captures more small dust particles from the air, but it also creates more resistance inside the ventilation system. As a result, the motor has to work harder to move the same amount of air.
Why a higher filter grade is not always possible
Modern ventilation systems are often designed with this in mind. Older systems usually are not. If a system is not suitable for a higher filter grade, this can lead to:
- -reduced airflow
- -lower ventilation performance
- -higher energy consumption
- -extra strain on motors and fans
- -a greater risk of wear or malfunctions
A higher filter grade may sound attractive, but it only makes sense if the ventilation system is technically able to handle it.
Is an extra filter box a solution?
Sometimes people consider adding an extra filter box in front of the ventilation system, containing a separate finer filter. In theory, this may seem like a good way to improve air filtration. In practice, however, this is often not a good solution for older systems.
An extra filter box also creates additional pressure loss. And that extra resistance can cause problems in older units. The motors in these systems are often not powerful enough to handle it. This creates the risk that the system will perform less effectively or be put under unnecessary strain.
That is why an extra filter box is usually not recommended for older ventilation systems.
The safest choice is often the correct filter grade for the system
For older ventilation units, a G3 or G4 filter is therefore often simply the right choice. Not because a finer filter would automatically be undesirable, but because the system was not technically designed for it.
It is always important to look at what the ventilation system can actually handle. A filter should not only fit in size, but also in terms of resistance and airflow characteristics.
Advice for older ventilation systems
Do you have an older ventilation system and are you wondering which filter is suitable? Then do not simply choose a higher filter grade without knowing whether your unit was designed for it. In many cases, that is more of a risk than an improvement.
In most situations, the best choice is a filter that matches the original system specifications. This helps keep the ventilation system working properly and prevents unnecessary strain on the unit.
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