To understand why Pfannenberg AC units do not need to have a filter installed.
Unit Type
DTS Series Models
Filter-Less Design
Maintenance
The DTS 3000 Series cooling unit is largely maintenance free. The components around the external air circuit require periodic cleaning and maintenance depending on the environmental conditions. Proper maintenance will ensure the reliable operation. Pfannenberg is not liable for damage as a result of poor maintenance and any resulting damage would be repaired at the user's expense. All maintenance should be performed by qualified personnel, following all safety procedures.
WARNING!
Disconnect the cooling unit from the power supply before any cleaning or
maintenance.
DTS Maintenance Video