Energy recovery ventilation systems installations are not permitted in which type of dryer exhaust systems?

Energy recovery ventilation systems are designed to improve energy efficiency by transferring heat and moisture between incoming and outgoing airstreams. However, in the context of dryer exhaust systems, particularly clothes dryers, the installation of these systems is not permitted. This is primarily due to safety concerns associated with the potential for lint accumulation and the risk of fire.

Clothes dryers expel moist air that can contain lint, which can obstruct ventilation systems if not properly filtered. If an energy recovery ventilation system were to be installed in conjunction with a clothes dryer, it could lead to hazardous conditions by not adequately venting this lint or by creating a situation where combustion gases might be inadvertently reintroduced into the living space.

In contrast, kitchen and industrial exhaust systems serve different purposes that allow for safe integration of energy recovery ventilation. For instance, kitchen exhaust systems manage cooking vapors, while industrial systems often involve processes that do not carry the same risks associated with lint accumulation present in clothes dryers. Therefore, the restriction on the use of energy recovery ventilation systems specifically addresses safety measures associated with the unique nature of dryer exhaust systems.