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I have the problem that Hawk alluded to, I ram so much air through my tent that I do not think that the exhalation of a colonizing mushroom block will raise CO2 levels for my plants.
I would love to be corrected....I have about 50 blocks in the garage right now. :0)
The issue of Oyster mushroom spores is a genuine one, as exposure can lead to mushroom workers lung. ...but I expect that the filter patch of those sacks will have a pore size small enough to contain any spores released.
I have had a slight positive pressure in my tent without harming my plants, but you will find that over-pressure will defeat your carbon filter and make the area smell dank.