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Panasonic FV-WC04VE1 Wall Cap for FV-04VE1 WhisperComfort ERV. Unique design allows for single exterior penetration. This unique wall cap allows both supply and exhaust air to pass through a single 5-1/2 inch exterior penetration The interior Y-adaptor connects to the 4 inch diameter supply and exhaust ducts and transitions to a single 5-1/2 inch diameter exterior wall cap. Both the interior Y-adaptor and external wall cap divides into dual chambers to separate supply and exhaust air flow The FV-WC04VE1 combines optimal function, minimum building penetration, and stylish design. (The FV-WC04VE1 wall cap is sold separately from the FV-04VE1) Width: 11-1/4" Height: 7" Length: 32-1/4" Cap is approximately 8-1/2" Square and 4-1/2" Deep