The universal reducer used for ventilation systems is 80 to 80°C. 200 mm in diameter. The diameter of the different diameter of the different diameter is 80/110/120/130/140/150/160/170/180/190/200 mm, decreasing or increasing. Transition ventilation pipe circular tube ventilation pipe The working temperature range is wide (-20 ° C to +65 ° C), and the year is quiet, comfortable and ventilated and efficient. It can be used with HVAC system: bathroom exhaust fan, built-in fan, range hood, heater dry, hydroponic system, kitchen or apartment, home or office. Specification: Material: plastic Weight: 8-20cm: 160g 15 to 18 cm: 120 grams The large reducer is the mother's head The small end is the head of the mother. of the reducer is the male characteristic Safe and reliable. Light, fast and easy to use. install Applicable to; all components of the ventilation system It can be used with the HVAC system Easy to install cut and to install There are many calibers of the catheter, and the