This is for a quantity of 1 Air amplifier 1.50" ID. Arizona Vortex Air Amplifiers utilizes a small amount of compressed air to create larger volumes of air, as much as 25:1 amplification. The total volume and the volume of compressed air is infinitely adjustable. Air Amplifiers are used to replace straight compressed air, fans, and blowers in countless applications. Arizona Vortex Air Amplifiers do not have the drawbacks of fans and blowers requiring guards for fans and the bulk of blowers. Vortex Air Amplifiers have excellent vacuum characteristics which make them perfect for air conveying and exhausting of fumes. Air Amplifiers are quiet, safe, and maintenance free due their having no moving parts.