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Remove the 6 screws around the entire frame of the unit, that will give you better access to the jet nozzle area. The high velocity hose should come off when you loosen the clamp. Let me know what you discover, we can go from there.
These were on the market about 50 years ago, and never caught on, very few if any of us have even seen one of those systems... we will have to play it by ear.
Please hold your rating until we get an answer and the problem is solved.
It is most likely that the entire unit pulls out of the wall... that would be because in order to be installed it had to be put into the wall, and only after the 2" high velocity air supply hose was attached with suitable slack, so that the box could be pushed back into the wall.
That is my best guess...I have been in the business for 51 years, but not worked on one of those, that is my view on how the system would have been put together however.
Its up to you, but I would suggest prying around unit and between the wall with a wide flat chizzle,, a little bit on each side of the unit... if it gives, then it is most likely stuck in wall, and some persistence should get it out....there is some risk of course, but that is my best estimate of the situation.
Hello again, I've been in the business since 1962... There have been a range of different manufacturers some still in business. The market saturation would be something like one system in 10,000 or 100,000.
Knobs of that sort commonly just press onto a shaft with a flat on one side... you might try prying it off.
At this point, your guess about how that comes out would be better than mine. I will opt out and we can see if anyone else here has seen one of those systems...thats very long odds though.
There might be detents that you can push in with a knife on each side of the unit to release spring clips that might be holding the box in place... it may have been a snap in arrangement. Lay the knife flat against the wall and feel with the tip of the blade for it, probably as close to middle of the side of the box as possible since we know there are none on the top half.