Has anyone else had the same problem that I'm having? I have a Ventech filter and centrifugal fan and they worked fabulously for the first two weeks then all of a sudden it's like there's no air coming out the ducting. When I first hooked my filter/fan up, the air flow was great, my tent had negative pressure, the opposite side of the ducting had a pretty powerful vent of air and I didn't even need to turn on my intake fan, the larger fan spun the blades with its powerful suction. Now, my tent is bowing outwards instead inward like it used to. I haven't changed anything on the filter/fan so I am completely vexed by this situation. So if anyone has had a similar problem or could shed some light on this situation, I'd greatly appreciate it, thank you.