A double-flow Heat Recovery Unit (HRU) is equipped with two main filter sections:
- Supply filter, which treats outdoor air before it is introduced into the indoor environment.
- Exhaust filter, which filters stale indoor air before it leaves the building, preventing coarse dust from depositing on the heat exchanger.
Recommended filtration classes
- Exhaust filter: Class G4 (ISO Coarse 60%) or M5 (ISO ePM10 50%)
- Supply filter: Class F7 (ISO ePM1 60% or higher)
A more efficient filter is more restrictive and can reduce airflow. For this reason, it is advisable to choose a balanced compromise between how much air passes through and how many pollutants are retained.
The exhaust filter mainly protects the heat exchanger, which can be damaged by coarse dust. In this section, a less efficient filter is often sufficient.
Geometric compatibility
It is essential that the filter is compatible with the dimensions of the section:
- The measurements must be identical or customized to ensure a perfect seal.
At AEROFEEL you can:
- Order custom-made filters to the millimeter
- Choose between framed and frameless filters
Choosing the right filter not only ensures cleaner and healthier air but also helps extend the lifespan of the system and reduce overall energy consumption, keeping the heat exchanger in optimal working condition.
