How the Type VII snorkel handled air and exhaust

Did the Type VII U-boat snorkel handle both intake and exhaust?

According to the featured Haynes manual, yes: it drew in fresh air and expelled diesel-engine air through the installation.

The answer checks the featured technical manual rather than relying solely on recollection. Its description identifies separate functions within the Type VII's raised installation. One passage drew fresh air down into the submarine, while another expelled foul air from the diesel engines. The clarification shows that this snorkel was not merely an intake tube but part of the boat's wider diesel-running arrangement at periscope depth.