vent header

vent header

A header, 4 (i.e., a horizontal vent pipe) that connects the tops ofVent stacks or stack vents at the header; a single vent pipe extends from the header to the open air above the roof.
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Typical applications include soil vapor extraction, vent header off-gassing, and landfill gas recovery.
Gases from the tank are drawn through the vent header by vacuum pumps and directed into the monitoring equipment.