concept

Ram ventilation

Letting the animal's own motion do the pumping instead of muscle. The fastest sharks swim with mouths cracked open so the sea is forced over their gills by their own speed - no muscular effort spent. A forward-facing flank slot on a Pandoran flyer could do the same with air - as the animal drives forward, the dense airstream is rammed into the slot, through the lung, and out the rear. This is the central inference for how the breathing fans work at speed.