Surely every resident of an apartment building often faced the problem of extraneous smells in the apartment. For example, neighbors cook food or smoke, and the whole smell goes straight to you through an outlet. Such unpleasant things happen due to reverse traction in the ventilation shaft. In order to avoid such unpleasant sensations in the future, many experts recommend installing the valve reverse ventilation. Its main function is to block the penetration of the spent air back into the dwelling.
Which allows the valve to effectively release the exhaust air and not let it back into the apartment? Everything is very simple. The valve blades are set so that the air leaves the room without problems, at one time the axis of the blades does not allow it to penetrate it. Roughly speaking, air can only move in one direction through the check valve.
It is important to understand that the check valves differ in the following characteristics:
The check valve can be made of various materials (galvanized steel, plastic, and t. D.). The valve material directly depends on the type of duct;
Flight valves can have a different design (membrane, grate, petal, butterfly). For example, in the check valve, the lattice provides for special blinds that open when the air flow from the room comes. In addition to the design and the ventilation grill (check valve), there may be a different design. The butterfly design valve consists of 2 plates, which are fastened with a spring, from here and the name;
The shape of the valve can be both rectangular or round. The choice directly depends on the duct. Household check valves have a diameter of up to 150 millimeters, and industrial can be up to 1000 millimeters.
