There is a common principle behind color coating lines: solvents are evaporated to cross-link the varnish molecules and cure the varnish. Critical here are three factors which determine your choice of heating type for the oven: product portfolio, energy consumption, and costs. That explains why autothermic ovens are popular for a wide product range. Here, a regenerative thermal oxidizing system (RTO) with a high thermic operating efficiency extracts and combusts the exhaust gases. Depending on the solvent content in the exhaust air, you can operate the post-combustion system without any additional energy supply. Plus, if you use an energy recovery system, the same applies to the ovens.