Aerated Floors

Aerated floors consist of PVC drainage pipe (OSMA or similar) either 160 mm nominal bore (4 mm nominal wall thickness) for shorter floors, or 200 mm nominal bore (5 mm nominal wall thickness) for longer floors, buried in concrete with nozzles (spigots) protruding from the pipes to a tapered slot in the surface of the concrete.

The pipes should have 48 mm diameter holes cut in them at 400 mm centres along the pipes, using a hole saw or similar, and then the nozzles either clicked or glued in place (note that gluing is not essential).