Produce > Under Glass

new poly tunnel

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Vinlander:
A good polytunnel supplier will offer the option of putting vents in the side - the clamping method is simple and effective but I would definitely recommend using the same technique to put vents in the roof instead and use mesh doors in place of the lower vents (this means you can still bury the 2 sides of the cover - much simpler).

A hole above your head allows the hot air to build up some momentum on the way out. It's not beyond the wit of man or woman to add an automatic vent lifter.

At some point I might use some old 5L olive oil cans to make hot solar chimneys like the ones that cool Portcullis House next to Parliament - except obviously with a clear roof they should be positioned above the N side wherever that is.

Why didn't they use this method for the BM atrium? - or maybe they did and it's hidden...

Cheers.

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