ventilation issue

buying or making a carbon filter is not such a big problem but problem is I have no exhaust hole ,no evac to the outside.Would it smell if i ventilate with carbon filter and all ,in the same room and not outside?

if your flowering "Box" had a carbon-scrubbed exhaust, you shold not have smell issues.

you have to ensure your seems are tight for that method of filtration. you can supplement the smell with a product like ona-gel

i am planning to grow one plant as it is legal here in a 40 x 40 x120 Darkroom
what do you recommend?

If you're really worried about the smell, add an ozone generator.....It goes inside the ducting and kills all of the smell before it exhausts it....I was worried about the same thing and you can literally stand next to the flower box with 18 plants inside and not smell a thing....The thing with an ozone generator has a specific smell to it kind of like a hospital smell but it's not that bad it beats the smell of the plants

I would but as I ll be sleeping in the same room.........heard they re not good fo health.