Gas filter element, filter device and method of use

A gas filter element comprising:

• a first end and a second end, having a plurality of inlet channels and a plurality of slotted outlet channels between the first end and the second end,
• wherein, in an alternating pattern, the plurality of inlet channels each have an inlet channel opening at the first end, and are closed at the second end, and the plurality of slotted outlet channels each have a slotted outlet channel opening at the second end, and are closed at the first end, each of the plurality of inlet channels being surrounded by 4 slotted outlet channels;
• each of the plurality of inlet channels and each of the plurality of plurality of slotted outlet channels having an inner cross sectional area, each of the plurality of inlet channels having an inner cross sectional area exceeding the inner cross sectional area of each of the plurality of slotted outlet channels;
• the plurality of inlet channels and the plurality of slotted outlet channels having common porous walls.