Flange-shut-off-flaps-and-grid-set for 240mm RoofWhirly4Africa roof mounted wind turbine ventilator (aka whirlybird vent)

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Grid and flange set for 240mm RoofWhirly4Africa roof mounted wind turbine ventilator (aka whirlybird vent)

Grid and flange set for 240mm RoofWhirly4Africa roof mounted wind turbine ventilator (aka whirlybird vent)

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