CFM VS LIFT

orbit-kleen

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Which is more important in a portable ?


From Cleancraft:


Lets breakdown a carpet cleaning machine. Basically, it is a machine that sprays water onto the carpet and sucks the water & dirt back up. There are other features that make carpet cleaning machines more dynamic, such as: heaters, pressure regulators, and auto features. However, when it comes down to it.... the more suction power you have, the more dirty water you will remove from the carpet. This sounds pretty basic, however, many carpet cleaners forget the basics when searching for a new carpet cleaning machine. It is easy to get caught up in unnecessary "features" that lead you astray from the main thing: Suction Power. Remember, you can put all the water, chemical, heat, and agitation you want down onto a carpet, but if you can't suck it out... you are left with hot, wet, dirty carpet !!

Now that we have focused our attention to suction power, lets define terminology: CFM vs. Lift. Many professional carpet cleaners do not know the difference between the two factors. However, a little knowledge in this area can help you choose the right carpet cleaning machine for your business.

CFM: Cubic Feet per Minute of airflow. This is a measurement of airflow.

Lift: This is a measurement of vacuum "Pull." Commonly measured in Water Lift or Mercury Lift. (To convert between the two, just multiple or divide by 14. Remember, High School Chemistry Class??? Mercury is about 14 times heavier than water. Example: 15" Mercury Lift = 210" Water Lift).

Both CFM and Lift have their purpose in carpet cleaning. However, the measurement that correlates with "Water Pickup" is Lift. The more Lift you have, the more water you can potentially pull out of the carpet. CFM does not pull water out of the carpet. CFM is the measurement of "wind" or "air" sucking into the vacuum motor. Try to think of it this way: When you turn on your vacuum, air is sucked into the vacuum hose. The blower or vacuum motor is trying to create a vacuum (the ultimate vacuum being an absence of air). When you place a wand onto a wet carpet, you create a seal. The vacuum motor continues to suck the air out of the vacuum hose to try to create a true vacuum (absence of air). When air is removed from the vacuum hose, the only thing that can now be "pulled" is the water in the carpet. The measurement of this "pull" is Lift. Thus, Lift pulls the dirty water out of the carpet, not CFM.

Now the obvious question: Why do truck mounts advertise their CFM so heavily? CFM is important on a truck mount, because you are probably going to be using hundreds of feet of vacuum hose. You need a great deal of CFM to remove the air out of hundreds of feet of vacuum hose, so the Lift can take over for your water pull. Most truck mounts have close to the same Lift. Thus, truck mount manufactures do not advertise their Lift as heavily, because how does their truck mount differentiate themselves from their competitors in this area? Truck mount manufacturers will advertise their CFM, because bigger blowers will produce more CFM.

So, how about portable extractors? Again, Lift is the important factor. Too many portable manufacturers advertise their CFM. Many manufacturers even produce so called "High Powered Portables" with tons of CFM (200, 250, even 300 CFM). However, this can be quite deceiving. Look at the Lift on these machines. Many of these high CFM machines have low Lift. They need to sacrifice the Lift in order to produce that much CFM. What good is a portable machine that can run hundreds of feet of vacuum hose (because of the high CFM), but cannot pull the water out of the carpet (because of the low Lift)? Many of these manufactures rely on the fact that most professional carpet cleaners do not know the difference between CFM and Lift. When shopping for a new portable extractor, look at the Lift. Remember, the more Lift, the more dirty water you will pull out of the carpet: producing cleaner & drier results.

Common mistaken statement: Many people will say, doesn't air dry carpet? So, shouldn't more CFM dry the carpet during cleaning? In reality, this is not being used in the right context. Sure, airflow dries carpet. However, airflow after cleaning (not during) dries carpet. Example: an air mover or fan blowing air onto the carpet after you are done cleaning dries the carpet faster. However, airflow moving through your wand does not dry carpet faster. Think about it: the wand is being moved back and forth over a small section of carpet only for a few seconds. The airflow coming through the wand for those few seconds will not do anything to dry carpet. The only thing you can do to dry carpet quicker in the actual hot water extraction cleaning process itself is to remove more water from the carpet while cleaning, hence, more Lift.

Does carpetcleaning-machine.com recommend a High Powered Portable Extractor? Yes, this website recommends the Eclipse by CleanCraft Products, Inc. This machine contains three individual vacuum motors producing high Lift for more removal of dirty water during the cleaning process.
 

Kenny Wright

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OK, isn't the right combination of cfm and lift what we really need?
 

locko-fabara

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we need both.
pull you will have only is the wand has a perfect seal. if not you will need the cfm to compensate the air leakage.
I also noticed the lift is very necessary for pull the water out, now the cfm move the water thru the hose, and also the amount of air passing thru the fiber will dry the carpet faster. but that is the only reason.
 

Ed Valentine

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I agree with both Jaime & Kenny's opinion and answer.

There is a formulation for top effiency and I believe this was written in a book titled "Taking the Mistique out of Carpet Cleaning".

However we have done this research way back in the early 70's, which btw, the book above has the research documention.

The very best to all;
Ed Valentine
"Smart-Designed" Systems
 

CleanBean

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I'm not really up on the Lift/CFM debate so I won't even act like I understand it totally.

When I decided to get a portable I was looking at the Truckforce, the Mytee 1003 DX, the Recoil, and the Eclipse. I finally narrowed it down to the Mytee 1003DX because the Truckforce and the Recoil were above my budget. Finally a guy offered his Mytee M5 for sale, it was slightly used. That sent me back to research. Everything I read on the M5 was very favorable so I went with the deal. Mytee was able to verify my machine was sold at the time the seller told me he bought it by the S/N.

My M5 is a great machine and its got great CFM. Mytee's spec state the CFM is 230. Now I don't know how accurate that is but I've been very pleased with it.

The point is I did my research and the guy that sold me my machine stood behind it because he knew in selling it the warranty wouldn't transfer. There are better machines than my M5 no doubt...but I know I have one of the best.

It did held up great in the porty shoot out too..and had 225 CFM...only 5 less than advertised. :AddEmoticons0423:
 

Lefty724

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I'm not really up on the Lift/CFM debate so I won't even act like I understand it totally.

When I decided to get a portable I was looking at the Truckforce, the Mytee 1003 DX, the Recoil, and the Eclipse. I finally narrowed it down to the Mytee 1003DX because the Truckforce and the Recoil were above my budget. Finally a guy offered his Mytee M5 for sale, it was slightly used. That sent me back to research. Everything I read on the M5 was very favorable so I went with the deal. Mytee was able to verify my machine was sold at the time the seller told me he bought it by the S/N.

My M5 is a great machine and its got great CFM. Mytee's spec state the CFM is 230. Now I don't know how accurate that is but I've been very pleased with it.

The point is I did my research and the guy that sold me my machine stood behind it because he knew in selling it the warranty wouldn't transfer. There are better machines than my M5 no doubt...but I know I have one of the best.

It did held up great in the porty shoot out too..and had 225 CFM...only 5 less than advertised. :AddEmoticons0423:

That is a great story CB!! I don't give a **** about all this porty debate, after all....it's our money. There is too many people around here that bash the "other guys" machine.

It gets old real fast IMO! All porty's are good nowadays and anyone can do a good job. All you guys should just be happy that you have a unit and are working instead of talking crap on the BB's! Sorry...just needed to vent a little!
 

CleanBean

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Thanks Floorguy.

BTW...I went to that carpetcleaniing-machine.com to check them out. One thing suspicious about that site is they RECOMMEND THE ECLIPSE ONLY. :confused:

That in itself makes the website suspicious....if they were interested in the best machines they would have more than one recommended because we know there are great machines out there....HMMMM?

I wave the BS flag on that site! :AddEmoticons04259:
 

Rick Imby

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When you hook up your vacuum motors in series you increase the lift.
The second vac will add 40 to 70 pecent of its lift to the total.

When you hook up your vacs in parallel you increase your CFM.

If you hook up different size vac motors in parallel you will end up with the cfm of the different vacs added together
but the lift will be the lift of the lowest vac.

When you add another 50 feet of 2" hose to your machine you decrease both lift and cfm by about 10 percent. Add another 50 feet and you decrease another 10 percent.

If 25 feet is the minimum you can work with in a porty when you go to 75 feet you will be at 90% capaciity of your machine. When you go to 100 feet you will be at 85% and when you go to 125 feet you will be at 80%.

You muist have more lift and cfm in your main vac AT THE POINT IN THE HOSE THAT YOU ADD THE BOOSTER than you add with a booster if your booster is in parallel. If not then the booster will outpull the mainline and splatter water all over.

The physics of this stuff is pretty simple.

Rick
 
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Thanks Floorguy.

BTW...I went to that carpetcleaniing-machine.com to check them out. One thing suspicious about that site is they RECOMMEND THE ECLIPSE ONLY. :confused:

That in itself makes the website suspicious....if they were interested in the best machines they would have more than one recommended because we know there are great machines out there....HMMMM?

I wave the BS flag on that site! :AddEmoticons04259:
Well the guy that owns that site is the same one that sells the Eclispe. What else did you think he was going to say? LOL
 

Kenny Wright

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Whe you hook 2 portables together with a Y connector and then run a single hose to the wand is that putting them "in parallel" ?

When you hook up your vacuum motors in series you increase the lift.
The second vac will add 40 to 70 pecent of its lift to the total.

When you hook up your vacs in parallel you increase your CFM.

If you hook up different size vac motors in parallel you will end up with the cfm of the different vacs added together
but the lift will be the lift of the lowest vac.

When you add another 50 feet of 2" hose to your machine you decrease both lift and cfm by about 10 percent. Add another 50 feet and you decrease another 10 percent.

If 25 feet is the minimum you can work with in a porty when you go to 75 feet you will be at 90% capaciity of your machine. When you go to 100 feet you will be at 85% and when you go to 125 feet you will be at 80%.

You muist have more lift and cfm in your main vac AT THE POINT IN THE HOSE THAT YOU ADD THE BOOSTER than you add with a booster if your booster is in parallel. If not then the booster will outpull the mainline and splatter water all over.

The physics of this stuff is pretty simple.

Rick
 

locko-fabara

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Thomas,
I noticed that in that website.
The ecplise has many bad designs, heavy , the cords positions, the way the vac motors are connected (plumbing).
the only thing i am happy is because it has a big square space inside that you can re-arrenge everything, do your own set up.
 

Rick Imby

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Whe you hook 2 portables together with a Y connector and then run a single hose to the wand is that putting them "in parallel" ?
Yes They will be in parallel. If you were to hook the second portable into the exhaust of the first one they would be in series. The Air Hog from Mytee hooks into the exhaust of the Mytee dual two stage vac machines. this makes them dual series quad two stage vacs. The Quad Dual parallel series is a very powerful vacuum setup. that utilizes almost all of the available amps in two circuts.

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Gnu

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In the most basic and simplest explaination.. the amount of C.F.M. flow. determines how much air flow is moving through an opening.. holes, hose, etc. the smaller the opening the faster vacuum is obtained and higher the vacuum pressure but the lower the c.f.m..

also things effecting all that jazzy talk. is simply put. the smaller the hose the faster vacuum can be obtained. and the negative force to remove the water is increased. at a faster speed. and the whole 4 to the door.. lowers the ability to create a faster lift until it builds up the vacuum to create the lift needed. but it will for darn sure inclease flow ..
 

rjfdube

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Kenny I was thinking of running 2 Recoils in Paralell some day. Then add a booster on the last 50 feet. Only thing is I need a 17kw generator(which Generac makes that is only slightly heavier than my current Generator).

I do however would like for CA to experiment with this first to see how well it would actually work and what would be the most efficient setup method!!.
 

Ed Valentine

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Rickie;

Actually, there is a much better way of acomplishing your goal, and this is something we already had developed years back anyways.

Our second generation would perhaps make it alot easier to do within seconds!

Thanks to all;
Ed Valentine
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CCWorks

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Kenny I was thinking of running 2 Recoils in Paralell some day. Then add a booster on the last 50 feet. Only thing is I need a 17kw generator(which Generac makes that is only slightly heavier than my current Generator).

I do however would like for CA to experiment with this first to see how well it would actually work and what would be the most efficient setup method!!.
I suggest when running out of a auto, Find a high power turbine motor and mount it to you trailer or van. Close off all ports (installed motors) on the recoil and just run the turbine. Hook turbine up to the 3rd vac port on the recoil. When you pull out the recoil re-adjust setting and use it as a portable again :)
 

Ed Valentine

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CFM vs. Lift. Many professional carpet cleaners do not know the difference between the two factors.
When I read the above quote from Ken above, it just made me think that what the Cleaner --really--does not understand or even consider in terms of CFM's/Lift is: "Design". It is the Design that elevates and keeps the efficiency at an optimum level. Hugh difference.

(Hence: Remember the design in glides that make a difference???!)


The very best;
"The beat goes on.............."
Ed Valentine
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