Growing with no air intake and exhaust? And without supplemental co2?

Indoor Growing
20
  • what is a make up air unit which return air at normal temperatures?
  • what means chain furnaces?

Dont understand :-//

  • How quick does the 12% get reached? Are we talking about pouring a pound of sugar every day? Because I fear starting to brew will be too much effort. (Go to supermarket buying stacks of sugar, after couple of days throw it away and start again)

Also I will start drinking too much as a result :smiley:

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