How much vacuum do i need to suck up bees.

[gregted]

I would like to make a bee vac for swarms and was wondering if anybody knows how little vacuum pressure is needed.

I would like to use a cordless Hitachi 18 volt blower/vac or a 12 volt inflating device used to inflate ski tubes etc...

The 12 volt item is high volume/ low pressure.

I have heard some testing their bee vac on polystyrene balls from a bean bag.

Is this the best test. ( Without trying it on my own bees )