Wheels are furnished standard of welded steel construction with spun steel hub and die formed airfoil blades. These industrial airfoil fan blades are heavy formed airfoil sections wider at the tip than at the root and of such a design as to create a completely new concept in axial-flow wheels. Running approximately 1/3 slower than the same size conventional design vane axial fan it produces the same pressure and volume. This 1/3 slower speed characteristic makes this fan the quietest vane axial fan on the market. If first cost is the main consideration then a smaller fan can be selected to run at the same speed as the conventional vane axial. Wheel cone is a heavy gauge spinning, conical in shape which adds to the fan's efficiency, low noise characteristic and strength. Streamlined cap protects internal wheel mounting parts and helps guide air to the blades in an efficient flow pattern. Catalogued in two different pitches (or two different models per fan size). Other special blade pitches can be provided to meet any job requirement.