I ordered a VIVOSUN 6" Fan and filter combo a little over a month ago. It worked well until about a week ago and I started noticing higher temps in my tent. It didn't take long to figure out that the filter had become very restrictive and very little air was actually being moved. I emailed VIVOSUN and they sent me a replacement. Now, 2 days after installing the new filter I'm noticing that it is becoming restricted as well. I did a quick Google search and found out that my humidifier may be causing the problem. I added the humidifier recently and after that is when the first filter became restricted. So, I turned the humidifier off before I left for work this morning. Hopefully that will help. Has anyone else had this problem before? Is there any way to get my filter "unclogged"? Before anyone asks, yes, I am using the pre-filter that comes with the carbon filter.