is it possible to hook up flanges to these inlet sleeves in my grow tent so i can connect duct fans???
no need mate, the sleeve will hug the outside of the duct, and you can add duct tape for that warm fuzzy feeling. Peace
For mine I bought a cheaper tent and the sleeves would not fit over the stated size. Like my 6 inch sleeves would not no matter how I did it fit over anything 6 inches. So what I did was use 4 inch ducting and cinch them then zip tied them around. I found that to be more appealing then cutting a hole out.