My new to me Rainbow E Series E2 Single Speed

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Good question

This is the first model that used a HEPA exhaust filter, and while the filter fit the compartment, there was room between it and the vacuum body. Looks like the filter got so clogged that dirt had no where to go. I'm willing to bet that they either ran it with not enough water in the pan, or no water in the pan. The old filter was stained so it appears that they may have over filled it at one point. I've NEVER seen one of these so dirty. I also believe they left it full of dirty water because the mud in the water pan was dried up like cement, and difficult to get cleaned out, but I did it. Obviously the people who had this machine before me either had no idea how to take care of it, or as I suspect, didn't really care. I can guarantee that this will never happen to this machine again because I do know how to take care of it and will perform routine PM to keep it running.
 
So the filter doesn't have a gasket? It looks like it just pushes back onto the opening.

With the oval filter, it has a gasket that pushes into the oval opening.
 
The filter does have a gasket around the frame, however with the amount of air pressure behind a clogged filter where else does the air have to go other than around the edges. Basically, At that point the filter frame would flex outward regardless of the back cover holding it in place and allow that mess to escape it.
 
Oh, I get how it fits in now

like in this video demo

the filter looks HUGE! bigger than the 2-speed oval filters. I clearly see the way it fits in now (not what I was expecting.)

It's so weird that the majority of the filter sits up against the side of the body of the vacuum away from the actual square opening.

Oh, and wonder what the goodvac guy was thinking with this music?

 

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