The amount of Nitrogen in the tank you linked is an absolute MINIMUM required for ctb. It leaves no margin for error at all. Really, you need double that amount, or more, of that 0.6m³ (600 liters) tank. You'd also, need to get a flowmeter to hook-up to the regulator that comes with the kit to control how much Nitrogen flows into whatever you decide to use to capture the Nitrogen - hood, mask, exit bag, etc. So, you'd also need to purchase a hood or mask, or make an exit bag, and then connect a line from the flowmeter you purchase to whatever you'll use over your head. I don't recommend trying to fill a room or space with the Nitrogen. For one thing, the 600L tank is undoubtedly not going to be enough.