Bypass motor with most airflow

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Several

systems us the Lamb 2 or 3 stage bypass motors. Some for very large or commercial installations even use two motors.
If you mean portable cleaners, then probably large commercial types.
 
Mark,

Just a clarification: did you mean a bypass motor in a domestic cleaner or a "clean air" machine that has a bag first orientation?

Bill
 
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That is impressive!
Are there any clean air machines that can reach 100 CFM at the floorhead? Or is that stretching it a bit?
 
Nilfisk GM80

My Nilfisk GM80 with two turbine industrial GMI motor (1000W) pulls huge airflow. Almost 9 on the baird airflow meter. And it is measured at the hose end.

mike811-2017032617115000801_1.jpg

mike811-2017032617115000801_2.jpg
 
Mark,

Yeah, I'd think that 100 CFM at the nozzle would probably be something of a record for a clean air machine.

Mikko,

That Nilfisk is pretty cool! A Baird 9 is about 108 CFM at the end of your hose. BUT, measure it once again at the nozzle end and watch the CFM drop an average of 20 CFM. :(

What does that Nilfisk pull on the Baird meter with the hose stretched out straight?

Bill
 
Bill

Oh yes cfm will probably drop when measured from the nozzle :(
I haven't measured when the hose is stretched out straight.
If I then get over 9 I would be stunned :)
 
Miele S7?

Vacuum-direct stated the Miele S7 has 141 CFM of airflow, but I have no idea where they measured that. I find that hard to believe. I have one though, and I can say that it does suck crumbs in front of the vacuum on hard floors with the brush off. Most other clean air vacuums with a 12 amp motor should be able to do that though, right?

http://www.vacuum-direct.com/miele-s7-jazz-upright-vacuum.aspx
 
Derek,

Yeah, that'll be a reading directly from the motor. What manufacturer would ever want to post a much lower nozzle number? :)

Even Aerus only posts out-of-the-vacuum motor specs, like the Guardian Platinum 505 Airwatts, 116" of water lift.

Bill
 
Maybe I should have said most airflow at the hose.
Would be good if manufacturers were forced to list the CFM at the floorhead.
 
Mark,

In my small collection here's the best hose measurements based on type of machine.

HOSE MEASUREMENTS (with HEPA bag/Filters installed)
Dirty air upright 120 CFM = Kirby Sentria II
Clean air upright 115 CFM = Panasonic MC-UG589
Clean air canister 95 CFM = Electrolux Olympia One (new vinyl hose)
Bag less upright 75 CFM = Dyson DC14 Animal

And yes, it would be GREAT if manufacturers were forced to list the hose and power nozzle CFM. But that will never happen because the world would explode. :)

Bill
 
Interesting Mike.

So is there any way to manufacture a cyclone unit that will have less impact on the restriction of airflow?
 
It's hard to say. Single cyclone vacuums with very powerful motor has most likely the most airflow.
I have to make a video with my Electrolux UltraFlex. It's designed so that I can measure airflow before the cyclone. With cyclone it has 4.5 airflow, but motor in it is 2100 watts so I guess it needs it.
 

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