In the venture Air Blower , air or steam enters a concentric manifold chamber surrounding a Venturi throat. A series of orifices located symmetrically around the chamber are positioned to expand the air or steam into the reaction zone downstream of the throat. It is here that the high velocity air or steam imparts its energy to slower moving air and accelerates it, which in turn draws more air through the throat into the reaction zone. A conical-shaped diffuser controls direction and expansion of the accelerated air.