I'm trying to add more ventilation to the back room of my garage. The only available outside air exit location is 25' horizontally along the front room of the garage's wall.
I have 6" 30ga sheet metal vent pipe like this for the ducting:
How would I go about securing it to the wall? All of the hangers and clamps I've seen are either nuts expensive or designed to support the pipe from above (ceiling), not from the wall.
I can't support it from the ceiling as it would interfere with the garage door mechanism.