messy inverted bags
Agreed, Alex.
The inverted bags are messy and the dirt never totally sheds off of them (in my experience) as the manufacturer claims. I have had a Eureka and a Broan, and installed a Beam in my parent's home, all with inverted bag, cloth filters.
I have had two Nutone's with bags. Very easy (and sanitary) to empty. But... the bags are expensive. The downside is the only time you have full suction is the first time you turn it on with an empty bag. But the suction generally falls of slowly, unless vacuuming something fine up such as plaster dust or flour, then it clogs rapidly. However, I would rather have suction weaken with use than go back to the mess of cleaning the inverted bag cloth filter.
Better yet, were my VacuFlo true "cyclonic" vacs. No filter and no bags. Just empty the container outdoors (while holding your breathe) and you're done. I occasionally washed the container out with the garden hose.
Best of all worlds are the newer Cyclonic Vacu-Maid central vacs models. My dream machine to own day own.
They offer some pure cyclonic models, but they differ from the VacuFlo units in that they use plastic trash bags in the container.
Vacu-Maid has patented the use of "air channels" to keep the bag from flopping around in the container due to air flow (which is why you can't use trash bags in other central vacs).
When it's time to empty, just drop the container, lift out the plastic bag. No filters to ever clean, no loss of suction with use, no dust clouds in emptying the container. A good setup. Cyclonic vacuums never lose suction with use. Suction when the container is full is the same as suction on day one of an empty container.
In cyclonics, when the air is spun in the machine at high speed, dirt is separated from the air and drops to the bottom of the container. About 98% of the dirt is separated. The remaining dirt laden air is exhausted to the outdoors..... never to be recirculated into the home.
When I moved recently, I got a new MD central vac off of Ebay (open box for very low price), it has the inverted bag cloth filter, but also comes with paper bags as the Nutone. It is not the bag on the top unit, like the MD Silent Master, but the conventional bottom fill bag like Nutone. I suspect the inverted filter bag will rarely if ever need cleaning.
Cyclonics are my favorite, but the price was so good on this MD unit (which are very high quality, and this model has very good sealed suction and CFM ratings) that I couldn't pass it up. Hope to get it installed in a few months.