I would hope that this is a vent pipe for a gas furnace. Intake, that is.
Or it could be like my wood shop, where the small machines are plumbed to a shop vac using pvc pipe to each, and the DC handles the big machines .I would hope that this is a vent pipe for a gas furnace. Intake, that is.
I am fairly certain it isn't a water pipe....I would hope that this is a vent pipe for a gas furnace. Intake, that is.
Typical HVAC work...