The easiest way i say to use the co2 from the cannisters will not be efficient but it'll deliver the co2 if thats what you want to do.

All you have to do is get a paintball marker and dont load any paintballs any it! Fire a couple of blank shot of co2 into the room and you have sucessfully delivered the co2. Once again this will probably not be efficient nor work very well but i gave him an answer to his question!