Air flow conditioning device

A filter assembly comprising:

• a support frame;
• a filter media coupled to the support frame, the filter media having a dirty side that receives an air stream and a clean side that outputs the air stream after having been filtered by the filter media;
• and
• a conditioning device coupled to the support frame, the conditioning device positioned downstream of the clean side of the filter media with respect to the air stream, the conditioning device directly contacting the clean side of the filter media,
• the conditioning device comprising a plate to condition the air stream, the plate comprising:
• a first plate section defining channels, the first plate section in contact with the filter media, and
• a second plate section in contact with the first plate section and downstream of the first plate section, the second plate section defining holes in series with the channels;
• wherein the channels are larger in cross-sectional area than the holes, the cross-sectional area taken in a plane perpendicular to a flow direction of the air stream;
• and
• wherein the condition device has an upstream side and a downstream side, the upstream side comprising at least one raised portion and a recessed portion.