with various pull out lengths

instructions and is easy to assemble

just unpack and unwind

and a potting sink for added functionality

Works with Palram - Canopia Prestige

Janssens | Greenhouse Roof Vent Color:Black with various pull out lengthsThe Janssens Greenhouse Roof Vent can be added to any Royal Victorian or Cathedral Greenhouse at the time of order. They come in black or green. Most Royal Victorian and Cathedral Greenhouse models already include at least one roof vent. You can add as many roof vents as you want to your greenhouse with the caveat that you cannot put the vents adjacent to each other so 'every other panel' would be the most you can add. Optional auto openers and fly