Your enclosure there is not even close to a 2x2x4, which is still small. It would be different if that enclosure was a square but its circular, it's like cutting the middle circle out of a 2x2x4 screen cage and losing about 1/4-1/3 of the space. All of my adult panthers, even females, are housed in either 6 or 7 foot tall by 3 or 4 foot wide by 3 or 4 foot deep DIY cages. Even in these cages I feel they need more room as they use even single inch of them when its warmer out. Once you get your new screen cage I think thing will just be easier for you and better for the chameleon. Also why didn't you just mvoe your reptiles out of the room? Towel are not air tight and let air through between threads and everything. Sorry if this sound harsh but I just dont get how someone could make such a stupid mistake with a living thing they cared abouts life, Next time if your useing a poisonus bug bomb that you wouldn't want to breathe in don't force your reptiles to sit in the room next door inhaling all the yummy goodness of death just because your were too lazy too or just didnt care enough to move them outside. Sorry but it had to be said. Good luck with your little one.
Justin