Electrostatic filters remove fine particulate matter such as dust and smoke from the air stream using the force of an induced electrostatic charge. In this way the electrostatic filters can clean the air for ~90% from smoke.
Roasting coffee is a beautiful process in which green coffee beans are being transformed into roasted beans that can be used to brew fresh, aromatic coffee. The roasting process always produces by-products like smoke and smell. Depending on the size of your coffee roaster you can choose an electrostatic filter or an afterburner to reduce the nuisance of the exhaust.