Do you mean to the duct or to the front of the case? The front is actually the exhaust end. To the front of the case the radiator is just attached with sheet metal screws. To the Duct, there is actually no physical attachment at all, since I wanted to be able to easily remove the sidepanel. The panels are of the usual attachment, so you put them on slightly back from their final position, then slide 'em forward to lock in place. So I just made the duct so that when it's put on in that initial position, it's sittining a couple millimeters behind the edges of the fan, that way I can get the sidepanel up against the case with no trouble, then when the panel is slid forward and locked in place the duct obviously moves forward with it, and slides up around and against the outside edges of the fans. Hopefully that makes it clear! It's hard to describe verbally.
But wait! I can use a pic and photoshop...
Here's the only halfway decent internal pic I've got of the radiator (unfortunately, I don't have my own digital camera, or I'd get you a better one), but you can see there're no extra attachments to it anywhere. I tried to show here what happens with the duct. In red, you see where the forward edges of the sidepanel and the duct are when the panel is put up against the side into its slots, but not slide forward yet. In blue you see the locations when the panel it slid up and locked in. This way there is no obstruction to the panel being put straight on from the side.
