This is a large multi-family project. This project is planning to meet IEQ 4.1 with continuous bathroom exhaust. However, the project team will not create exhaust pentrations for each kitchen because of the exceptional cost. They plan to use recirculating kitchen hoods, and they can plan to increase the bathroom exhaust to a higher air flow (i.e. 45 CFM higher). The kitchen is located within 10 feet of the air handler, which should increase air exchange in the kitchen. Can this approach pass for IEQ prerequisite 5.1?
Recirculating kitchen fans do not help to meet this prerequisite because they do not provide ventilation air or remove humidity or pollutants from the home.It is possible to meet the requirements without ductwork to the exterior walls. This can be achieved by providing ductwork through the attic/roof, which can also facilitate combining all the exhaust ductwork (for all units, including bathroom and kitchen), and using multi-port exhaust fan systems for cost savings. Such systems only require proper radiant dampers to meet fire codes if the ducts are designed properly and are small, thick metal ducts.
Updated 10/1/13 for rating system applicability.