Diamond AP1N/L64 Upright Refrigerator 700 LitresEnvironmental odours will usually affect wines that are stored for longer however theWKt4552 is able to prevent this by maintaining perfect air quality through an easily replaceable FreshAir activated charcoal filter. WKt4552Ventilation 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.