They don't seem to be, and I have no idea what could clog them with the way I use it.
UPDATE: I called support, and they said that even just the electronic issues are enough for them to send a replacement. The will also be paying for shipping to have me return the current unit so they can figure out what's going on. While I was on the phone they put in the replacement order and said I should have it within 1-3 days due to where I live, so I should be back up and running at full speed by the end of the week.
This is how people want a company's support to behave, but not many do. I'm still very happy with my Roffu over all, and getting this kind of support is how you build brand loyalty.
Sorry I don't know how to do multiple quotes from different people on here. @
noceb0 mentioned the filter being a possible issue. What filter?
I tried sucking on the oven hole (sorry, that sounds so wrong) without the device on of course, and I could still hardly get any air through it.