Venlo greenhouse 8,00 m 40.752 m²

For sale: Venlo greenhouse 8,00 m 40.752 m²
Number of square meters: 40.753 m²
Trellis: 8,00 m
Section size: 5,00 m
Post height: 5,50 m
Gutter: Aluminium Boal
Ventilation: 1-pane, 1400 mm deep
Glasssize: 1.662 x 2.113 mm
Info: still available to be viewed buit-up. Please contact us for an appointment!
Contact:
Hans Kerklaan
Tel: [phone] (Also WhatsApp)
E-mail: [e-mail]
Noordeindseweg 346a
2651 LM Berkel en Rodenrijs
For our entire range of used greenhouses, please visit www.kerklaanho...

[@1984Yusif]

But what about the drainage system in the top of the greenhouse? Can you explain how it works?