Of course one should always do what one thinks is right. Even if it is just for ease of mind.
But things like 'fresh air' are human judgements. Us humans like rooms where the humidity is not too high and the amount of CO2 is not too high. If we stay in a room where the CO2 is too high for a long time, it makes us feel tired and can cause even headaches.
By opening a window and letting in 'fresh air', we even out the amount of CO2.
Plants absorb molecules of CO2 through the stomata and O2 through their roots. There is no 'bad' or 'fresh' O2. O2 is O2.
Plants also don't care about high levels of CO2 (not too high of course)
O2 isnt the part that is "bad" or "fresh" and O2 is O2, but air does become "stagnant", the term literally refers to the air quality being too low to be safe to breathe, Air Stagnation. Too much CO2 and plants will close their stomata and stop uptaking O2 from their roots and stop retaining water and lock out nutrients, turn yellow and die, they become sick from CO2 toxicity within a couple hours above 2200ppms, also if a single powdery mildew spore got into a sealed room where would it go? Your air scrubber also wont scrub the spores or anything but the organic material in the air thats meant to be absorbed by the activated carbon behind the screen, it will not improve your air quality past reducing the particulate count in your room and removes organic terpenes from the air through absorbtion, it will never however create a clean and breatheable enviroment on its own and doesnt make it any safer to have that scrubbing the air then it would be to turn on a fan for circulation with an air filter taped to it. all your are really doing is eliminating the smell of any airborn paticulates or terpenes in your air and taking out the dust and organic particulates. Im concerned that legitimately in less then a couple hours my CO2 would be over 3000ppm with the bags, id have to ditch those and solely rely on my burner for enrichment. The plants will use the CO2 over time and i doubt it would build up too much unless the burner malfunctions and stays lit, the bags just pump it out faster then plants use it.
Look i know you would never let the plants get CO2 toxicity or allow the air in the room to be unbreatheable and that would be the extreme end result, but in anycase air quality drops the longer a volume of air stays in one spot unchanged. Plants def care about O2 or the roots would die. CO2 readily combines with water to create carbonic acid, this kills everything. And nothing likes CO2 to be more then 1500ppm's except for maybe some of your more tropical varieties of plants or jungle vegitation like ferns but still topping out under 2000ppm's. When water goes bad or becomes stagnant its not because the water dissapears from the cup or is a different molecular make up, its still H2O, but its because its not safe to drink. This is because its either polluted or full of nasty bacteria or its not being 02 enriched as it should be to stay from becoming stagnant, like you would aerate your res or the solution goes bad. Same as air stagnation doesnt mean the air is gone, it means what your plants are breathing is unhealthy and could lead to a variety of problems for you in the future such as contamination and low transpiration levels and slower growth rates. Nobody said O2 went bad, nobody said that air goes bad, i said air quality is reduced, as it is over time in a stationary volume of air (circulated or not) and that is called Air Stagnation. It exists and it happens, its not a judgement call, or made up by people it literally means its hard and/or unhealthy to breathe and the air has been depleted of O2 or is full of nasty contaminants and particulates that reduce air quality. Ill keep getting fresh air to my plants because i feel they need it. i still think ur flowers are badass and looking super healthy, props for being able to seal your room and it not be an issue, im too skeptical to go full seal and not allow any air exchange to happen.
Not bothered by it at all, actually enjoy the debate!
