sorrey to interject on your thread but i just want to make sure I have the right thing. I suffered a brain injury in a car crash and can't remeber my conversation with my grow shop guy (and al lot of other things lol)
this is for odor only.
if you need to attach fan to barrell use high temp aluminum tape makes duct tape like a band aid. this stuff is great.
I used to work in pest control and we would use ONA to mask certain odors. they have one that is a liquied you stick a paper towel in as a wick. If you spilled on you stunk like deodorizer for a week and there was no getting rid of it. so be careful. perhaps setting several around the exterior of your tent might do some good as well as by entrances to tent area as well.
this unit ran about 180ish at shop
good luck
JS