The sealing valve of the smoke exhaust hood is correctly pressed.

does the subject want to ask "the sealing valve of the exhaust hood is correctly installed"? According to the law, confirm the installation position of the sealing valve, check the state of the sealing valve and press the sealing valve.

1. confirm the installation position of the sealing valve: the sealing valve is generally installed at the exhaust port of the smoke exhaust hood to control the ventilation volume of the exhaust port and ensure the sealing performance.

2. check the state of the sealing valve: before pressing the sealing valve, it is necessary to check whether the sealing valve is in the closed state to ensure that the sealing valve is in an operable state.

3. Press the sealing valve: When pressing the sealing valve, you need to use appropriate force to ensure that the sealing valve can be completely closed to achieve the sealing effect.