Philips Expression FC860214 Jul 2007 My vacuum cleaner is a Philips Expression FC8602 capable of sucking air at a rate of 40l/s and pulling a vacuum of 30kPa.
According to the pressure unit convertor I found earlier, that's about 9 inches of mercury. Hopefully, that will be enough.
I've also seen "CFM" mentioned a lot. CFM stands for Cubic Feet per Minute, with 1CFM being about 0.472l/s. So my vacuumcleaner would be able to pull about 84.7CFM