Stand horizontally behind. A few months later they wheezed very strongly. I took it off, blew it, shook it - it seemed to be the norm. Not for long. After another 3 months, they wheezed very strongly. When you move the pancake with your hand, something directly clings inside, which causes wheezing. Blowing doesn't help. They stand almost in sterile conditions, there is nothing special to get there. Addition: Dismantled, cleaned (which is very difficult to do) - again wheezing after a couple of months. In general, for a vertical installation - take it and do not think. Under the horizontal - in no case, or think anther.
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