I have a DR80 and am having a hard time keeping my temps below 80F. I am using a mini pulsar 250 watt switchable light which is an all in one lamp with ballast built in. I also have a 5" can-fan (206 CFM) that i am using for an exhaust at the top of my tent. my can-fan is sitting on top of my tent and is pulling air out of the tent. i have my can-fan hooked up to a carbon filter which sits inside of my tent. air is being pulled through the filter and out of the tent. I thought this would help with high temps but i was wrong. I went out and purchased a 250 CFM duct booster to see if that would help. I setup the duct booster in one of the ports located at the bottom of the tent to help get air into the tent. for a fan that is rated 250CFM it sure is weak when compared to the can-fan 206CFM. am i doing something wrong here? my tent is located in my stand up shower in my bathroom. it fits nicely in there and is stealth. the ambient temps in my bathroom are around 73F while the temps in my tent get to 86F when the lights are on. i am exhausting the air back into the bathroom but leave the door to the bathroom open. the tent has passive intakes down at the bottom but if they are opened, light will get in when lights are out. i was thinking of getting another duct booster but the first one I got didnt seem to help. can anyone help me out? thanks.