These are the air vent pipes outside of the garage. These vent pipes are about 4 inches in diameter, they have large cartridge type air filters underneath the cans on top of the pipes. The tops of the pipes are 5 to 7 feet off of the ground. I'm not absolutely sure which pipe is the air intake. I think it is the far pipe in the photo. That pipe is more inline with the side of the shelter the blower is on. There is also a vent pipe through the ceiling of the entry room that goes up through the roof of the garage. I can't remember if that pipe had a filter or not.

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