diff --git a/mlair/data_handler/data_handler_mixed_sampling.py b/mlair/data_handler/data_handler_mixed_sampling.py
index 71f9fe732e306b76f24f1f1455fc8830cf1492e1..718a8f3ecf6a799cfab3c273a525f05d07132627 100644
--- a/mlair/data_handler/data_handler_mixed_sampling.py
+++ b/mlair/data_handler/data_handler_mixed_sampling.py
@@ -194,13 +194,32 @@ class DataHandlerMixedSamplingWithFirFilterSingleStation(DataHandlerMixedSamplin
     _requirements = list(set(_requirements1 + _requirements2))
 
     def estimate_filter_width(self):
-        """ """
-        return 5  # Todo: adjust this method
+        """Filter width is determined by the filter with the highest order."""
+        return max(self.filter_order)
 
     def _extract_lazy(self, lazy_data):
         _data, _meta, _input_data, _target_data, self.fir_coeff = lazy_data
         super(__class__, self)._extract_lazy((_data, _meta, _input_data, _target_data))
 
+    @staticmethod
+    def _get_fs(**kwargs):
+        """Return frequency in 1/day (not Hz)"""
+        sampling = kwargs.get("sampling")[0]
+        if sampling == "daily":
+            return 1
+        elif sampling == "hourly":
+            return 24
+        else:
+            raise ValueError(f"Unknown sampling rate {sampling}. Only daily and hourly resolution is supported.")
+
+
+class DataHandlerMixedSamplingWithFirFilter(DefaultDataHandler):
+    """Data handler using mixed sampling for input and target. Inputs are temporal filtered."""
+
+    data_handler = DataHandlerMixedSamplingWithFirFilterSingleStation
+    data_handler_transformation = DataHandlerMixedSamplingWithFirFilterSingleStation
+    _requirements = data_handler.requirements()
+
 
 class DataHandlerSeparationOfScalesSingleStation(DataHandlerMixedSamplingWithKzFilterSingleStation):
     """