Abstract: An air purification system includes a reverse flow heat exchanger, a combustion chamber and a means for heating particles configured to cause particles in air to combust in the chamber. The reverse flow heat exchanger transfers excess heat from the purified air to the incoming air to lower the amount of energy needed to combust the particles in the combustion chamber. The means for heating particles can comprise a flame or a microwave emitter. The reverse flow heat exchanger is spiral wound around the combustion chamber.

Abstract: An exhaust system includes a reverse flow heat exchanger having a plate separating an intake chamber and an exit chamber, each chamber having an inlet and an outlet located at opposing ends to allow flow therethrough. The plate can include a vane connected to the end of the plate in the vicinity of an inlet or an outlet. The vane is configured to reduce resistance to fluid flow near the intake chamber inlet. The exhaust system includes a heating manifold, such as a combustion chamber, configured to receive an exhaust stream from the intake chamber, further heat the exhaust stream, and return the exhaust stream to the exit chamber. Embodiments of the system can be configured to additionally perform as a catalytic converter and/or a muffler.