Fan Attached to Airform
This inflator fan is built for pressure over volume. This fan will put well over 25 inches of water column pressure, which is a lot for a concrete Airform tube!
Image by Don Garrison
Sourced from Monolithic Commons
Posted to Pushing the Limits: Airform Seam Strength and Concrete Culverts
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Image by Don Garrison from Monolithic Commons via Monolithic Dome Institute (CC BY-SA 4.0)