5x5 tent with no positive or negative pressure

I am trying to create an environment where as little if not no new air is introduced and little to no air pushed out. I have a 5x5 tent. After researching portable ac's I found that dual hose ac's use outside air to cool the until and expells the same air out. There is a second intake on the unit that uses the air in the room you want to cool and passes that air through the coils then back in to the room. This should make it so no air is blowing out of the cracks and no air being suckdd in cracks.

When the tent is open there is no real wind blowing and even with no barrier the temps inside the tent are cooler by 8 degrees than air outside the tent. However with the flaps closed the sides of the tent slowly suck in the pull hard so there is negative pressure. I am using 3 air cooled lights. 2 are 8" and 1 is 6". The fan is a max fan 8". When that fan is on the sides suck in even more. The fan sucks air from tent and blows out other side in to tent again so the only thing I can think of is there is restriction from 8" to 6" and the powerful fan sucks more air than is blowing out so air from outside tent is sucked in to compensate? but then where would that "lost air" in the hoods go because there is no where it is blowing out. What am I missing?.

Co2 exchange.

Yes I will have co2 in the room but I need to figure out where the air is going since it is sucking the sides in hard or else I'll be exhausting all the co2. Right? Sides are sucking in means air being blown out somewhere? he only exhaust is the hot air out the ac.

There is 1 intake and 1 exhaust in the whole set up. That is for the dual hose ac.

I'm guessing because the passive intakes are either to small or there are none so that between the a/c and the exhaust fan the suction of those is greater to than that of what they can pull in. Or they pull in considerably more than what they put out. Maybe due to hot air going in which would be a lot of hot air where as coming out its denser colder air.

Try opening a zipper if your looking to even it out. Not really sure what your goals are exactly. With out co2 recycling the same air is a bad idea. Then again I'm not sure what you got set up.

I want a sealed room basically. I don't want air going in or out so I use little co2 keeping the ppm's where I want them. The ac has an intake and exhaust both 6". So I have 6" ducting to the zip tie holes in the tent. So it should be sucking garage air in and across the condensor then blow outside.. so technically the garage should be negative pressure and sucking air in from cracks in doors. The ac has a second intake which goes across cold coils. That intake and exhaust is from the air inside tent so it should be neutral because no air is blown out of the tent or sucked from another location. However something is sucking air from the tent and blowing it out. I have checked everywhere with a lighter (wind blows thw flame) there are no leaks on the ac exhaust hose and no holes for air to suck in the ac intake hose. Yet when I close the tent and put the flame by where the zippers meet I might as well put some weed on a screen and smoke the ladies out because it sucks the flame in to the tent. And it gets worse with the max fan for cooling the lights. I have the fan in middle of room sucking tent air and blowing through the lights then when it hits the last hood it goes back in to tent. I am using the same air because the temps are a nice 74. garage temp is 76.

Have you thought about leaky hoods?

Could your lights be allowing air up into them through the glass seal?



J

The hoods do leak but everything is in the same room so it's leaking in to where it needs to be anyway. Think that could be it?

You should put your ac outside your tent and have the exhaust go out a window.

Then have the cool air duct from the ac hooked up to the fan then blow into the light hoods and out of the tent through ducting



like this




AC>>>>8"fan>>>Lighthoods>>>>other side of the tent.

This would reverse the pressure and cool everything down while moving air out without loosing all your co2

That was my last 2 set ups. It blows air out of the tent then. The dual hose ac advertises no positive or negative pressure because the air blown in the tent is taken from tent and air blown out window is taken from outside.

I re read what you said and I'll end up doing that if no better idea's. The leaking cooler air may cool the tent as well.