In terms of structural form, natural flap ventilator can be divided into open natural vent and opening & closing natural ventilator.

The difference is whether the natural vent is equipped with a valve plate. The valve plate is mainly used to control and adjust the ventilation effect of the natural ventilator, which is equivalent to install a "door" at the position of the roof opening, and the ventilation volume can be adjusted by controlling the opening degree of the valve plate.

The open natural vent is not equipped with an opening and closing valve plate, long-term ventilation without gaps can be carried out indoors and outdoors. It is an environmentally friendly and energy-saving natural ventilator.

Opening & closing natural ventilator, equipped with a valve plate, can control the opening and closing of the light-weight natural ventilator. The valve plate can be manually or electrically controlled to adjust the valve plate to control the amount of indoor ventilation, and it can also achieve connection control of firefighting, relying on smoke, wind, heat, etc. for linkage control.

Compared with open natural vent, opening & closing natural ventilator have an additional electric valve plate device. This electric valve plate can control the opening and closing of the natural ventilation system. 

Mcwell has been focusing on the design, production and installation of roof smoke ventilators for more than 17 years, and has accumulated rich industry experience.