You can use a Hoklartherm Greenhouse Drop Door Kit to place your Nelke PRO 4 Greenhouse on a 20" knee/stem wall. The kit has aluminum pieces to replace the vertical extrusions on either side of the door with taller extrusions that run from the ground all the way up to the eaves in one continuous piece for added strength. It will include a piece of polycarbonate to fill the header space above the doorway.



Hoklartherm Greenhouse Assembly
Questions & Answers
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what is the overall dimensions of the door? Janssens Hinged Door, double door
Check out this PDF for the most requested dimensions for the Janssens doors - this has rough openings for stem walls, single and double sliding and hinged door dimensions.