There are other airfoil impellers available, but when asked I only recommend using them if you can put them after your filters, meaning they only move cleaned air. Even if you meet these needs, unfortunately the firm I had making the custom extra heavy duty airfoil impellers was sold and the new owners have discontinued selling these units. When the airfoil impeller gets out of balance or begins buffeting it can quickly ruin motor bearings, catch your motor on fire and even cause these impellers to explosively fly apart. I worked with an impeller engineer and came up with a center vane in the airfoil that keeps this impeller from stalling up to about 8". With an average two car garage sized shop running about 10" of static pressure, we cannot use an airfoil impeller in shops larger than a one car garage. A one car garage sized shop will have a maximum pressure of about 7" even with very carefully chosen large ducting. Worse, typical airfoil impellers have bad stalling and buffeting problems when the pressure gets over about 6". When they do this they can become badly out of balance.
This means they can build up wood shavings and stringy material. Unlike a self cleaning material handling impeller, airfoil impellers have tops making them caged impellers. There are two major problems with airfoil impellers. Please read the disclaimer at the end of this page.Īlthough I very much like the idea of an almost twice as efficient impeller, most cannot use an airfoil impeller safely and they are not readily available. A blower is a powerful high-speed device that if you build wrong could cause fire, damage, serious injury and even death. This particular page steps you through the process I used to build a blower. The purpose of this site is to share what I have learned with other woodworkers about the hazards of wood dust and what I did to help protect myself and my family. Blower Frequently Asked Questions (FAQs).
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