Universal reducer for ventilation systems 100/110/120/130/140/150/160/170/180/190/200 mm Durable material: designed and engineered for use in ventilation systems both indoors and outdoors, made of high-quality material resistant to external factors (high-quality PVC plastic), no rust It can be used with the air conditioning system: bathroom extractor fan, fan, extractor hood, W tumble dryer, hydroponic system, kitchen, or any other place in the apartment, house or office. Wide temperature range of use (from 20°C to +65°C) with quiet, comfortable ventilation all year round and very efficient. All in one: this is a very practical solid tube reducer or diameter height that allows two different solid pipes or flexible pipes from small to large, from large to small. Using machine time and vice versa.