There is no fixed standard for the installation height of Sanitary Check Valve. It mainly depends on factors such as the ceiling height, the location of the flue outlet, and the size of the selected check valve.

‌Ceiling height‌: Generally speaking, most check valves can be installed when the ceiling height is above 27 cm. However, if the ceiling height is lower, such as about 20 cm, the height of the check valve needs to be considered to ensure smooth installation.
‌Flue outlet location‌: The location of the flue outlet will also affect the installation height of the check valve. When installing the check valve, it is necessary to ensure that the flue outlet and the check valve are tightly connected and have no gaps to prevent air leakage. Therefore, it is necessary to accurately measure the location and height of the flue outlet before installation in order to select a suitable check valve and determine the installation height.
‌Check valve size‌: The size of the check valve is also an important factor affecting the installation height. The common check valve sizes on the market range from 10cm to 18cm, of which the 16cm size is the most widely used. When choosing a check valve, you need to choose a slightly larger check valve according to the diameter of the flue opening to ensure tightness and functionality after installation.