im growing in an old building very simmilar to a world war bomb shelter i was wondering if a 15cm wide tube running into to building from outside would ventalate the air inside well enough to grow the plants, thanks for help
You didn't mention how big the building is. Whatever you're going to need powered (fans) intake and exhaust. And an oscillating fan inside for air distribution and stem strength. Plants like all living thinghs need fresh air. MJ especially since it grows so fast.
