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A HS is considered commissioned only if the HS passes all the following tests in one inspection:

a. Light penetration test of HS door – an acceptable test method to check on light penetration into the HS is to use a torch-light from the exterior of HS door. The test is considered to have passed if no light could be seen from the inside of HS.

b. Chalk mark test on the HS door – an acceptable test method is to apply chalk to the part of the door frame where the door seal will come into contact with when the door is closed. The test is considered to have passed if there is an unbroken and uniform transfer of the chalk markings onto the door seal when the door is closed and re-opened.

c. Air-tightness test of the HS – an acceptable test method is to pressurise the HS and measure the rate of pressure drop or the pressure difference between the interior and exterior of the HS. The *pressure gauge can be used for the test. The HS is pressurised by pumping air into the HS such that there is a pressure difference of 250 Pa* between inside and outside of HS. The HS is considered to have passed the test if the pressure gauge shows more than or equal to 50 Pa after 45 seconds.