I wasn't able to confirm this as a construction door as I found it on free-to-play, but it's definitely a Collapsing doorframe.
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Doors are an integral part of Dungeoneering. There are a number of different types of door that...
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|current||09:15, November 19, 2011||807 × 637 (474 KB)||Image optimisation bot||(Automated) PNG recompression|
|23:36, August 5, 2011||807 × 637 (554 KB)||Spineweilder||LD free|
|07:48, January 23, 2011||755 × 589 (418 KB)||Ejp10||Bigger.|
|03:35, April 15, 2010||329 × 318 (151 KB)||Vibo||I wasn't able to confirm this as a construction door as I found it on free-to-play, but it's definitely a Collapsing doorframe.|