Defrost damper and mechanism with defrost failure protection system to ensure trouble-free operation. 

External electrical access side panel for easily removable parts. 

Balancing dampers. 

Filtration of outdoor pollutants.

Deep one-piece condensation pan prevents water leakage and offers easy maintenance. 

Fully convertible energy and heat recovery ventilators to meet specific needs. 

Unparalleled technology. 

Aluminum framed foam filter.