Zehnder CK300 Rigid Twin Duct, 2 x 158mm x 69mm x 1.5m AX3504 in Black) with foam in

in Black) with foam in cover

125mm or 5" solid ducting is recommended to minimise air resistance

Frost Protection Only Required At Extreme Outside Temperatures Of Around -6 °C

This QuietAir Basic Fan carries the Quiet Mark Approval and is part of an extended range of elegant

Optional smart frost protection

Zehnder CK300 Rigid Twin Duct, 2 x 158mm x 69mm x 1.5m AX3504 in Black) with foam inThe Zehnder CK300 rigid twin duct has an extremely low profile and compact design. It is suitable for use with the Zehnder ComfoTube Flat 51 semi rigid manifolds. The smooth, hygienic twin duct is made for air flows of 83. 3 l s (300 m h) at low pressure drops. It measures 65mm high x 326mm wide x 1500mm long. Zehnder P N 990 322 051 (Old Part No 990 322 020)