Frequently Asked Questions

The unit should be relatively close to an exterior wall to minimize the length of the insulated duct to the exterior vent hoods. The outdoor duct connections must be insulated with a complete exterior vapor jacket to prevent indoor moisture from condensing on the inner duct, which would water-log the insulation layer. The duct connections to the heat exchanger and the exterior vent hoods must be designed to maintain the vapor jacket over the insulation. The fresh air intake must be located approximately six feet or more from any exhaust device, including discharge from the HRV/ERV, and it should not be installed where noxious gasses from outdoor sources are likely to be present, such as the exhaust of an automobile in a driveway. See our document, Considerations for Locating, Installing, and Ducting Heat & Energy Recovery Ventilators.

A continuously operating whole-house mechanical ventilation system is the best method to ensure a proper amount of ventilation. American Aldes offers a full range of continuously operating whole-house ventilation products. See our document, Introduction to Indoor Air Quality to see illustrations of 6 different configurations, including 1. Continuously operating exhaust systems 2. Continuously operating exhaust systems with on-demand boost 3. Continuously operating HRV/ERV or fans with or without boost 4. Continuously operating HRV/ERV for fans plus on-demand rangehood 5. Continuous operating exhaust plus on demand bath fans and rangehood 6. Continuous operating supply plus on demand bath fans and rangehood.

ASHRAE has identified several different climatic zones in the United States. See our document, Residential Applications by Climatic Zone. for guidance, or contact an Aldes expert for assistance at 800-255-7749.