Quick CO2 Question... Advice required (UNIS co2 controller)

I run a 4 x 4 x 4 tent with no active fan for air in - it is a passive system

(i have only the extraction fan and the vents in the side of the tent for air flow in)

Can i use bottled co2 in this set-up???

It goes like this

Filter>Fan>Ducting>Pushes through a Magnum XXXL>Ducting>Up and out of the tent and property

I was going to use a UNIS controller which approximates the size of the tent and doses accordingly - advice appreciated

Anyone... im worried about the co2 being sucked out of the room

However, if enough hangs around to be beneficial and i run my air cooled lights on higher temps 80-90F it means less warm air escaping the building which can only be a good thing?

Advice?

Come on people - anyone else running it this way?.....

Come on peeps... Surely someone must be using the UNIS controller, my temps are currently sitting at 90F and 30% Humidity which i thought would have been ideal for co2 dosing???

Anyone use an Ecotechnics UNIS controller?...

anyone..... looks around.....

bringing up an old thread, but does anyone have any input on this situation, as i am pondering purchasing a unis with almost the same kind of setup