The place in the office building where the manhole must be installed.

In the office building, the places where the manhole must be installed mainly include the following areas:

Central air conditioning system The indoor unit of the central air conditioner is installed in the ceiling, so it is necessary to reserve an access opening on the ceiling near the electric box, and the recommended size is ≥35×35cm, which is convenient for technicians to enter the maintenance. ‌

fire extinguisher system Sprinkler system: An access port should be reserved in spray head to facilitate later maintenance. Smoke sensing equipment: The smoke sensing equipment installed in the ceiling shall be cleaned and maintained in coordination with the access door.

Distribution system Strong and weak current box: it is necessary to reserve an access port or a hidden cabinet to facilitate operation and avoid affecting equipment maintenance.

Cable shaft: If concealed cable shaft is used, an openable access port shall be set in a hidden position. ‌ ventilation system

New air duct/exhaust fan: the valve and filter screen need to be replaced with a maintenance port.

Fan coil unit: it is necessary to reserve a manhole in the ceiling to facilitate the cleaning of filter screen and equipment debugging. ‌

piping shaft Water supply and drainage pipes: maintenance openings should be reserved in areas such as toilets to avoid damage to the ceiling structure by later maintenance. ‌

Gas pipeline: Valves and inspection points shall be provided with openable inspection ports. ‌