Circulation of fresh air is critical for many confined space entries. Teams are turning to the efficient and easy to use venturi blowers for a number of reasons. To start with, Plastic Allegro venturi blowers are lightweight, efficient, and intrinsically safe because they have no moving parts. Power for the blower is created by compressed air or steam being introduced to the cast chamber at the base of the unit. Circulating air creates a Venturi effect pulling air in through one end and blasting it out the horn-shaped diffuser. The Venturi blowers are able to clear large volumes of air containing gas and vapor as well as dust and particulate matter. Venturi air blowers are available in a range of sizes depending on the dimensions of the space you are trying to ventilate. The smallest blower is 16.75 in. overall can move from 815 - 1182 CFM (cubic feet per minute) while the largest option, 46.06 in., is capable of moving between 3152 and 4152 CFM - A massive amount of air when compared to traditional axial blowers.