‌Generally, the size range of Sanitary Check Valve is between 10cm-18cm, among which 15cm, 16cm, and 18cm are the most common sizes‌‌.

‌16cm size‌‌: This is the most widely used size, because the size of the smoke pipe in many households is 16cm, so choosing a check valve of this size can ensure a perfect match with the smoke pipe‌.
‌Other common sizes‌‌: In addition to 16cm, 15cm and 18cm are also common size choices. These sizes can meet the needs of different household exhaust systems‌.

When choosing a check valve, it is recommended to directly measure the size of the flue or exhaust port at home to ensure that a check valve of the right size is purchased. At the same time, the sealing of the check valve also needs to be considered to ensure that it can effectively prevent gas backflow‌.