actually many got deceived by suction power figures nowadays. Many brands suction power do not have a standard method of measuring. Robam in malaysia claim to have an Unrestricted Air Flow Rate: 2010m³/h
https://robammalaysia.com.my/product/id/cxw-220-a670

However, in china and also in user manual it only spec air flow : 19m /min or 1150 m3/h only. SO why the big difference? unrestrained air flow = no specific method used, so u can boast and spec as high as u wan. From what i know, CHINA adopts IEC standards in measuring suction power.
EVIDENCE :
http://global.robam.com/index.php/product/productdtl/46.html
http://www.robamindia.com/1613-2/
https://www.manualslib.com/manual/1590831/R...l?page=6#manual

Fotile JQG9031 unrestrained air flow 1750m3/h, but IEC standards 1350m3/h
http://www.fotile.com.my/products/JQG9031.html

So if compare with the same international standards FOTILE is stronger
JQG9031 @ 1350m3/h vs robam 1150m3/h

However, Robam SPEC unrestrained air flow as 2010m3/h, that is very HIGH almost double the actual performance.

Fotile max static pressure is 460pa vs robam 430Pa, fotile win also