This has been brought to my attention from Sergeant !shira!, as seen here and a recent PM from him (which will not be disclosed).

Dustycaseitis. It's ridden in everyone's rig. Everyone tries to keep it out with filters and other tricks, but it still gets in. After a period of time, temperatures increase and soon you'll probably wonder why your rig is a few degrees higher than normal.

It's a disease: It slowly chokes the life out of your parts and eventually kills them, especially parts that require fans. Examples are CPU fans, Northbridge fans and Video cards. They are not limited to said parts, however. It could be anything.

So, with the help of !shira!, I've sorta "created" Case Cleanout day. At the 18th of every month (or whatever day in that week feels good for you), everyone in the Guild (and not) is encouraged* to clean out their cases of dust bunnies. It only takes about 1-2 hours for a total cleanout, and it can help your temperatures - I just cleaned mine out and my CPU temps dropped from 19C to 18C Idle

You're fans will thank you!

* = It's "Encouraged" since nobody is forced to. Think Earth Day