What is the exhaust diameter of the bathroom integrated ceiling wall

Residential buildings are generally designed with air ducts, and the air outlet pipe of the exhaust fan directly penetrates into the air duct.

1.It depends on whether the sanitary partition wall reaches the top and whether it is connected with other areas; 2. See if there is any abnormality in the ceiling on the top of the bathroom, 3. Whether it is an independent ventilation fan or a central air-conditioning system; 4. Identify the type of paint smell so that you can find out the cause faster.

Remove your ceiling, I personally estimate that there are two possibilities. >>>More

Absolutely, because the exhaust interface on the heater and the heater outlet are not connected to each other, so you don't have to worry about the dirty air in the air duct entering the room. For example, Panasonic warm bath has the function of exhaust and warm air, exhaust is to suction air and discharge it to the outside, and warm air is to suck in indoor air and heat it before discharging it indoors.

This thing won't be big, as long as it's not blocked, you don't need to take it.