deal for use with the Panasonic FV 04VE1, this exterior wall cap is an attractive and efficient way to provide a channel for both supply and exhaust air with a single 5 1/2″ penetration. The interior Y-adaptor connects to the 4″ diameter supply and exhaust ducts, transitioning to a single wall cap. Both the interior Y-adaptor and external wall cap divide into two chambers to separate supply and exhaust air flow. The wall cap is polypropylene, and can be painted.
Panasonic ERV Dual Chamber Wall Cap