Filter for purifying an air stream

A filter for removing contaminants from a gas flow, the filter comprising:

• a filter housing extending along a main gas flow direction from an inlet end of the filter to an outlet end of the filter;
• a plurality of panel filters arranged in the filter housing and spaced apart from each other to define a plurality of elongated gas flow channels extending generally in the main gas flow direction;
• wherein the plurality of elongated gas flow channels includes at least one inlet channel arranged in an alternating manner with at least one outlet channel, the at least one inlet channel configured to receive the gas flow at the inlet end of the filter and the at least one outlet channel configured to output a filtered gas flow from the outlet end of the filter;
• a gas flow blocking structure defining a downstream end of a respective inlet channel of the at least one inlet channel, the gas flow blocking structure fully blocking the gas flow through the downstream end of the respective inlet channel;
• and
• a gas flow obstructing structure upstream of the gas flow blocking structure, the gas flow obstructing structure extending partially across a width of the respective inlet channel to obstruct the gas flow through the respective inlet channel;
• wherein the gas flow blocking structure and the gas flow obstructing structure cooperate to redirect the gas flow in the respective inlet channel through at least one panel filter and into at least one adjacent outlet channel.