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MB – I use solar exhaust fans on the gables of hobby greenhouse came with place (cement floor with water, electric, propane – but don’t use the electric or propane) and have the auto-openers filled with wax for 2 lower and 2 upper panels that I ‘set’ by how far I turn them.

Here I use shade cloth I clip over the outside on the aluminum channels all summer 70% in my case so they don’t get so stressed. I don’t care really for this greenhouse now that I have used it for years because it has a cement floor and can’t plant in the soil.