Large Tunnel Growhouse Garden Plant Greenhouse with PVC Cover The tunnel greenhouse provides plenty of protection against rain, wind and pests. The tunnel has a sturdy tubular steel frame and heavy-duty polythene cover with a roll-up zipped door which not only provides easy access, but ventilation in the warmer months. The cover has 10cm excess at the bottom which can be buried to provide extra security in storms and strong winds. Dimensions: 300 x 100 x 80cm