It usually best to only use "keyboard" handi-vacs to vacuum computer parts -- home floor vacuum cleaners, with their high air velocity, tend to build up a lot of static which is deadly to your computer.
While I've been known to whip out the floor vac, slap the hose attachment on and use that soft, bristly head attachment to really get the dust out, I have since stopped doing so. While it did a great job, the thought of electrocuting my computer didn't sit well with me.
Just a suggestion.