The smoke changer needs to be reamed, and the ceiling should be completely dismantled

Don't listen to their nonsense. If you just change the doors and windows, this can not be calculated based on the construction area, you directly find the decoration company that makes doors and windows and tell them that you want to change the doors and windows! They will price according to the material and quantity of doors and windows you need! >>>More

The main pipe is to pay for everyone, and the roof maintenance is also to pay for it, yes. Go to the community committee and ask, there should be an overhaul fund, try to pay for it. It is a good thing to replace the main sewer pipe, the old main pipe, easy to block, and the light to dredge a few more times, it is also a lot of money, and it is troublesome.

You don't need to press the ceiling first, after installing the cabinet hood, the position is set, and the hole is being dug. I sell integrated ceilings! >>>More

No, because the size of the hood is when the cabinet is installed, not the ceiling. Therefore, to make a wall cabinet for cabinets, you need to buy a range hood or provide accurate dimensional data.

First, you are right, if you remove the ceiling, your sprinkler head must be changed to spray upward, and the smoke detector must also be adjusted to the ceiling, and it costs money to change this sprinkler head; Second, "must be changed", this question is difficult to answer, anyway, the norm is not allowed; It is not allowed by the local fire department; I'm afraid the property won't allow it, and your neighbors won't allow it if they know it; It is also not allowed from a practical security point of view. If you can balance the above factors, then there is no problem, you can not change it. 3. If it is a formal procedure, before the fire protection system is changed, the modification plan issued by the unit with design data must be submitted to the fire bureau for approval, and you can only modify it after approval and approval.