The installation of fire hydrant box and hydrant mouth shall meet the following requirements: the hydrant mouth faces outward, the center of the valve is 1.1m from the ground, and the allowable deviation is 20mm; The valve is 140mm from the side of the box and 100mm from the rear inner surface of the box, with an allowable deviation of 5mm. The fire hydrant shall be installed flat and firmly, and all parts shall be complete and reliable.