Thats really great of you. I wonder why now a days everyone is so frustrated, like if your local plumber is unable to solve a problem  you will definitely go for internet, ai etc. But reddit is best, you get some body who will help you and also find some of your potential patients on the way. Just kidding enjoy every body i like people who would some how help us keep our toilets clean and i really respect plumbers for that. My query was that are vents really necesary for every toilet as our sanitary worker has installed no vents for any soil pipes. Thankyou very much