Preparation before installation of roof hatch Preparation before installation Confirmed location:
it shall be set at the gathering place of pipelines, near equipment or at a location convenient for operation, so as to avoid corners or hidden hard-to-reach areas.
Determine the size: If personnel need to enter, it is recommended to reserve 600 mm× 600 mm; If it is only used for inspection or threading, it can be 400mm×400mm or less.
Material selection: there are commonly finished gypsum manhole (integrated with ceiling) and aluminum alloy manhole (light and corrosion resistant).
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