Hossfly...One thing about that insulation is that is easy to cut and handle, it's really dense. It's 1" thk. & too thick to wrap the entire oven so Iam splitting it in half to cover the top and other side.
jsizemore... I understand this about recovery time using 2 sets of elements and I can put the second set on the bottom back in service if one set will not do, but...I want to try this and time it from a cold oven, full tray (about 175, 200 gn. cast).
While ordering a heat sink for the SSR, I ran across this chef's pocket thermometer & ordered it too...thinking that it can be mounted in the enclosure above the PID and I can see in an instant if this cooling fan is doing an adequate job of venting the enclosure or if something else is going awry...excessive heat is prolly the no.1 enemy of these solid state electronics.