Figure 7 - uploaded by Rafael Moliner
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Diesel Particulate Filter (DPF) technology, channels are sealed at the inlet in a chessboard manner (Johnson Matthey). 

Diesel Particulate Filter (DPF) technology, channels are sealed at the inlet in a chessboard manner (Johnson Matthey). 

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... the collection efficiency is often rather low, and thick filters with high pressure drop are needed. Wall flow monoliths consist of a ceramic structure of parallel channels, half of which are closed at the upstream end in an alternate way, checkerboard manner, whereas the other half is composed by channels that are closed at the downstream end ( Figure 7). Thus, exhaust gases are forced to flow through the porous wall, which act then as the filter itself. ...