A towed airport ground-support pre-conditioned air unit finished in bright blue. The boxy machine sits in a tubular frame on a two-axle trailer chassis with a drawbar, rugged tires, and a side control panel of gauges, dials, and indicator lights.

Large flexible corrugated ducts loop from the top of the unit, ready to feed conditioned air into a parked aircraft cabin.

A detailed piece of ground equipment for airport-apron and hangar dioramas, model railroad airfield scenes, and modern tabletop bases where servicing gear brings the ramp to life.