Diamond AP1B/L64 Upright Freezer 700 LitresEnvironmental odours will usually affect wines that are stored for longer however the WKr4211 is able to prevent this by maintaining perfect air quality through an easily replaceable FreshAir activated charcoal filter. WKr4211 Ventilation button can control the humidity as required.. Liebherr's PowerCooling system rapidly cools down freshly stored items while creating a consistent cooling temperature throughout the interior.