But I would leave it plugged in, but switched off, so that any static is discharged to ground. Or else unplug and use an anti static wrist strap, which you connect to ground.
Take a look at the link and you will get the idea. I would imagine you might have something like it hanging around somewhere, though keep in mind it must let air in or out, so nothing to dense. Even with the best of filters some dust will still accumulate inside the case over time.
Foam though will decrease the airflow quite significantly and needs cleaning out more frequently or it will get bunged up. Just need to be careful when using filters.
Yes hold upright if you hold it upside it will start to freeze stuff
Gonna get one of these... Compu Cleaner Xpert Air Duster | Ebuyer.com Get a great deal on a Compu Cleaner Xpert Air Duster as well as thousands of products at Ebuyer! www.ebuyer.com