Question about a "sealed" room

[Jack Harer]

My current flower room is almost completely sealed from outside air. I have been putting a pretty good fan in the doorway for about an hour or so every day to get some air exchange going until I can figure out how to properly ventilate. Odor isn't a prob, bringing in air from outside in the winter is. Also, I'm gonna be making seed, so bringing in air from the main part of the building won't be an option until I can get a HEPA filtration system. No pollenation going on at the moment, is an hour a day sufficient to exchange the stale air with fresh?

 

[DemonTrich]

I run a sealed flower room, with zero air exchange. A deheuy is a must and co2.

 

[stoned-trout]

so intake air from house or supplement co2....yeehaw..I cut through my floor and draw cool air from under house luckily and live in great climate in so cal san diego...aint hard to make a hepa filter setup ...everything ya need is at home depot...mine is a floor vent setup and hepa filter with poly fill in front of it..with only 1 hour of venting I bet your plants are starved for co2