Tag:man made=air vent

Often a pipe or a hole used to exchange air between different locations, for example from a sewage tank or an underground parking lot. In rare case a fan can be installed to get a better air flow. Don´t confuse with air conditioners or heat pumps on roofs.

Use air_vent=* for the type of lid:

you may not need the man_made=air_vent if air_vent=* is tagged

air_vent =	description	image	usages
chimney	free standing pipe that can be attached to a manhole. Often waterproof by a small roof or an 180° bend. See also man_made=sewer_vent
grid	floor vent hole covered with a mesh or metal grate or grill to prevent animals and trash from falling in. Often used for underground parking. See also man_made=ventilation_shaft
holes	small holes in a manhole cover, sometimes used as rainwater inlet
no	no vent installed