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Is vacuum cleaner motor ok for fb roaster?
Can vacuum cleaner motor (600W?!) be used for fb roaster? Is the amount of air enough?

The roasting chamber is ID 80 mm and 310 mm high glass tube. Air inlet hole diameter 28 mm. Plan is to get 250 g green beans at least.

For example:


Thank You!
Edited by renatoa on 02/17/2022 3:10 AM
Is overkill, check here how 250 grams are lift by an 110-130W air pump.


The pump is for camping/pool/airbed inflate. Check Bestway Sidewinder AC Air Pump on Amazon.
Wow, I love this air pump! Great find. If he needs 220 V single phase, do they come in a high voltage model?
1/2 lb and 1 lb drum, Siemens Sirocco fluidbed, presspot, chemex, cajun biggin brewer from the backwoods of Louisiana
There should be models for US market too, on 110V, if this is what you mean...
I found something similar on

Thank you!
Can you guess what might be the max green beans amount of my ID 80 mm X h 310 mm roasting chamber?
Nope, sorry... guesses aren't my strong ability.
What I can tell you for sure is the glass in the video is similar with yours, because the cocktail shaker funnel is 80-82 mm diameter.
And the fan power at start is 100%, as you can see on controller display.
So the margin to add some greens is very low, maximum 50 grams more, "I guess" Grin

What I want to emphasize with this example was how low you can go with the fan power, compared to what you asked.
500 Watts seems more appropriate for one pound of greens, and using proportionally bigger glass.


renatoa wrote:

There should be models for US market too, on 110V, if this is what you mean...
I found something similar on


The vacuum motor walk had linked to was a 220V motor so I had assumed he/she needed to keep the build at 220V so was wondering if there was a 220V version of the air pump available. If walk will need 220V, I'm sure there must be a EU version of the air pump.
1/2 lb and 1 lb drum, Siemens Sirocco fluidbed, presspot, chemex, cajun biggin brewer from the backwoods of Louisiana
I use a 600W vacuum motor on my 300g roaster. Yes, it's overkill, but usable (just). I start the roast on 20% airflow and end on 12%.
This creates a good idea of my need, Thank you!
What is your rosters heating power and how many percent max is used?
1800W and running up to about 95%.
Great, thank you!

I need to design a heater holder. I plan to fit a temperature sensor between the heater and the inlet, which takes about 20 mm. Should this distance be increased for any reason?
I see on amazon cordless vacuum cleaners rated 300W, sounds as the right power you need... maybe their motors are available as spare.
But they are DC, if this matters...
At the moment I am thinking about use of that:


1. The body fits well to my plans
2. 24VDC 6A makes 144W, and it should fit good.
3. Should be easy to control with TC4+ PWM
4. No brushes! I prefer brushless motors noise and brushes makes also smell.
5. The whole motor is isolated from air flow.
6. The motor cooling will be great.
Edited by renatoa on 02/18/2022 6:50 AM
Puzzled how you plan to use/mount this motor in a FB...
Maybe you aren't aware that the small center 23 mm round opening is for suction, not for exhaust of the air !
If you plan to mount the heater on top of that opening, won't work.
One picture is a thousand words. I'm planning something like this right now.
walk attached the following image:
Can't comment, quite unusual design...
Uncut view
walk attached the following image:
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