I just ordered my enclosure. This is what they sent me:
qty. 1 of 20-12125PM no vent holes $95.00 with clear anodized handles, no vent holes, we will first put the gold alodine inside and black painted outside only to make it EMI Shielded.
So I guess the gold alodine is the shielding agent?
I bought the 5" just in case Raife finds a new transformer in the future that is larger and then I'll be able to upgrade ;)
I ordered it UPS ground since they are only 16 miles away.