Check out Rocket blowers that are used by photographers. I use one in conjunction with an artists paintbrush or you can get blowers with brushes on the end. Be careful with vacuum cleaners and fans, it's easy for the suction to get the fans spinning and it has been known for them to spin quick enough to put a negative charge through the header and blow the motherboard. If using a vacuum cleaner near a fan I will always put my finger in the blades to stop it spinning.
Check out Rocket blowers that are used by photographers. I use one in conjunction with an artists paintbrush or you can get blowers with brushes on the end. Be careful with vacuum cleaners and fans, it's easy for the suction to get the fans spinning and it has been known for them to spin quick enough to put a negative charge through the header and blow the motherboard. If using a vacuum cleaner near a fan I will always put my finger in the blades to stop it spinning.
The pressure is pretty localized, I usually brush a component / fan then use multiple squirts of the blower to shift the loosened dust as it's not sufficient on it's own to blast stuck on dirt free. The process is more labor intensive than a can of air but cheaper in the long run and much more preferable to sticking your head in the case, blowing and getting a face full of dust. I guess it depends on how obsessive you are about keeping your kit clean but for ~£5 it's a fairly useful tool to have on hand at cleaning time for not much money.I've come across this recommendation before, I checked out the reviews for one on the rainforest but apart from cameras people used it for keyboards. Is the air pressure effective enough for the inside of a case?
IF your interested in fan filters, use a pair of your Mrs old tights / stockings, very stretchy, non restrictive and catch dust, cheap easy alternative. Stretch them over the front of your fans and then simply hold it in place with the fan screws themselves, 4 corners, dont require cleaning either, they are a disposable item.
A mains powered airbed inflator works really well and they cost under £10.