Is toilet drain hole 105 cm appropriate?

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Not suitable, the toilet is at most centimeters from the wall.

Are you referring to the counter under the toilet? 30 centimeters is too high, usually 10 centimeters is enough.

The back drainage and side drainage can be done, but the lower drainage is too far, the drainage will not be smooth, and it is easy to block.

30 cm for medium and lower toilets: 20 to 25 cm for rear toilets; The distance between 40 cm and more is the front flush toilet.