More Airflow Tests Part II

[blackheart]

Another Filter Queen.

This time a Model 112b. I just finished cleaning the unit out today. I should add I did include all the dead space as part of the nozzle width as i usually do include that on other machines.

I'm also going to be running a week long test to see how Filter Queen retains airflow. I'll probably measure hose CFM day to day as getting set up for nozzle measurements is a pain but i'll probably take one the final day.

 

[rivstg1]

I have this model so I’ll be anxious to read your findings

 

[holeefuk]

karcher CV300/380

i am use alternative methodology for measurement and able reconcile back to other data points and Anemometer methodology. ultra bag half full, filters low mileage.

 

[holeefuk]

Simplicity 7Series

I measure 92cfm on my 2001 Simplicity7

other data points and methodology with comparable vacuum this pull about 100CFM at the hose use Anemometer. Does 1.15" reducer nozzle adapt for a 2"+ Anemometer probe skew the result? 10% CFM drop in unloaded versus 7/8" orifice loaded. that's quite impressive and show the power of dual fan

 

[holeefuk]

Sebo Airbelt C3.1 Canister Vacuum

I measure 104cfm at body and 87cfm at hose on a 20 year old Sebo Canister.

Measured use new X ultrabag and old hospital grade filter (red) i clean out. A new HEPA filter (yellow) reduced a couple CFM as comparison. I fill old paperbag full with this vacuum and it reduce performance 15-20%; not sure how ultrabags cope. I cut open the paperbag and all layers clogged. I think if add backup oring seal to hose/handle and it will pull 90+, new hose or nonelectric hose.

Appears comparable to current model D4. I think D4 should maintain performance with full bag from top suction path design. D4 have taper hose advantage too.

 

[ridgidwd0670]

where can i find the cfm measuring device? i want to measure cfm of the following:

compact c9
ridgid wd0670 (aka workshop ws0600va they are identical) with 1 1/4" hose & 2 1/2" hose
electrolux 1205
eureka esp
hoover elite

 

[lesinutah]

Hey

Go to Amazon preferably since it gives you reviews. Look up anemometer. There 20-40 typically.
I believe c9 is 130 range, so eureka 130-140, Hoover I have no clue.
Les

 

[holeefuk]

https://www.thinkvacuums.com/central-vacuum-pressure-gauge.html

There's more than one way to skin a cat. The Anemometer gm8901 measures air velocity directly and then is converted to CFM. You could get to the same answer with a vacuum gauge and properly sized restrictor plate.

The vacuum gauge will also allow you to measure sealed suction.

 

[blackheart]

A C9

I can't imagine it's more powerful than the CXL which scored about 97 CFM at the hose end. The highest score we've seen from a canister at the hose was a suped up Marquis at 115CFM, it's believed that it has one of the Perfect C101 motors in it.

 

[lesinutah]

Hey

Your talking hose end I was measuring at the beginning. I believe it was around 100 cfm at end. It may have been 120 ish my royal backpack was 118 the c9 was 123. At the hose beginning. But 100 or high 90s at hose end. That the 7 ft crush proof no leak brand new hose. I am finishing my c8 tommorow. I have brand new motor and basically everything is brand new. I took entire bag off measuring air flow. Well the bag upside down on lid sealing lid and not blocking air.
Les

 

[mike811]

My highest airflow canister is the Miele C3 1600w (using 1400w).
I measured 121 cfm from the hose end and 94 cfm from the nozzle.

 

[lesinutah]

Hey

Mike your vacuums seem to have more power than over here in United States. I'm going to build another airflow box. I had a 12x2.5 in opening in top. What is diameter of your opening.
My prior box had 2 gas lead blowers and a shiz ton of vacuum items smash it up. I'm going to build a rectangle box to go inside box and not collapse.
Thanks I did my tests I want to say a few months ago but it's more like 6 months so my numbers are off memory there were precise but I didn't write them down so it's memory. I hope to back up words I spew.
Thanks
Les

 

[mike811]

Yes it is slightly more powerful than the US models.
My airflow box opening for the GM 8901 anemometer is 58 millimeters (2.28″).
Nozzle opening is 25 x 5 centimeters (9.84" x 1.96")

 

[mike811]

Here is Vorwerk VK 135 results after replacing the dirty hepa filter. Unusually high cfm for a clean air vacuum. I think key for the results is the simple airpath. Internal pipe goes straight to the bag without any tight bends. Power usage is slightly over 1000 watts.

 

[lesinutah]

Hey

What material is your box made of. It looks like sheetrock or plaster board. I imagine my local habitat for humanity I could get green gypsum board for $5 to make a box. It's a nice box. I'm not positive on my anemometer but knows it's slightly bigger than 2 5/8".
Les

 

[mike811]

It's made from the plywood. Top part is stronger waterproof plywood. It's hold gather with screws and construction glue.
On top of the opening it has glued down cardboard to make the nozzle are slightly higher, but this step is not necessary.
Seal is the key. Otherwise measuring results are not accurate.
I hope this helps.

 

[lesinutah]

Hey

Yes seal is key. I have plywood it's thicker plywood. I'd either use my spray foam insulation. I'm probably going to take ansmomter to parts store and get PVC pipe same diameter and glue in front of box so no air loss. I would make sure no air leaks anywhere. Sealing durability and accuracy are top priorities. There is a PVC adaptor I'd use plumber's glue and the PVC pipe would be air only go through the PVC pipe. I'm glad I asked I'll post it when I have it finished. It will be accurate and durable.
Les

 

[blackheart]

Another!

Recently acquired this from Hoover300, thanks again. I've not seen too many victory style machines in recent years. One of my friends' families had a red model when I was younger, so I've always been curious to know whether or not they were good machines. It did better than I expected it to it didn't seem like it had much power from the hose and it definitely leaks as when you place your hand over the hose you still have air blowing from the exhaust.

All that said it's a decent machine. It has more flow than most bagless machines despite being 18 years old.

 

[blackheart]

Dirt Devil 103

I did these a while ago and I forgot to take some measurements like wattage and suction. I see that I wrote 36.98 CFm for hose airflow and 6" for hose suction on this model.

 

[blackheart]

Another old test

46.21 CFM from the hose no suction rating in my book but I think it was somewhere between 8 and 10 these have a little more power than the 2 amp version and had the bag tube built in.