The spider folk, excluding their legs, are about the size of a golf ball but they are very numerous, they are highly venomous and, they're invading. Various tactics have been tried but the invaders have incredibly fast reflexes, are tough and can reproduce quickly by carrying off and cannibalising the dead bodies of their fellows. It has been discovered that sucking them into huge vacuum cleaners is an effective way of disabling them.
To begin with they didn't perceive vacuum cleaners as a threat until they were in the area of 'suction' and by then it was too late. They aren't very intelligent but they are now getting wise to this.
Can I focus the 'suction' to give a greater range. If not how else can I increase the effective range of the vacuum cleaners at a distance from the nozzle?
Is this even theoretically possible? I believe blowers can be focused but suckers?
I can find discussions of increasing effectiveness at the nozzle but I haven't yet been able to discover anything about increasing (or indeed focusing) it at a distance from the nozzle.
Please do not suggest other weapons. Of course these are being trialled as well but I particularly want to focus on vacuum cleaners.