Can the toilet vent be blocked

No, you can't! Ventilation holes may be connected to the kitchen or bathroom of each home!

There are several approaches that can be taken:

1. Dun cloth method: use your mopping dun cloth. First put the cloth at the mouth of the toilet, and then put water to ensure that the water submerges the cloth. >>>More

It should be that there is a problem with the waterproofing of the bathroom on the second floor, and we had a similar problem some time ago. >>>More

Just open the sewer inspection port and poke it open

If it's a roof, you don't need a vent! If it is a self-built house with wooden purlins, it needs to have vents for ventilation - to prevent the purlins from becoming moldy!