How to Attach an Airform Preparing Ring Beam — Rebar is bent over so that the Airform can be slid over the rebar and attached to the footing. Attaching airform — Airforms can be attached a number of ways. The most common is a thin metal strap that is screwed on the outside with concrete screw anchors. Inflator fans — After the Airform is attached, workers will attach inflator fans to the domes via air tubes that are welded in place. Airlock — Once the air is turned on, workers will attach the air lock. The air lock serves as the entry point to the dome during the construction process. The airlock has two doors, so that while entering the dome, pressure will not be lost. Dome is inflated. — Dual fans are used, and often dual power sources, to decrease the chance of power loss. Keeping the air pressure in a dome is the most important factor during dome construction. These fans are called SC3s