Airtight and deformable sealing gasket for greenhouse vent closures

In a greenhouse having a stationary roof defining an elongated edge and a vent closure defining an elongated edge and movably mounted between an open position and a closed position wherein the edges of said roof and said vent closure define an elongated air gap therebetween,

• the improvement comprising
• an elongated gasket means secured to the edge of said roof for deforming into airtight sealing contact solely with the edge of said vent closure to close said air gap when said vent closure is in its closed position and the edge of said vent closure is moved downwardly into compressed sealing engagement with said gasket means, said gasket means including a pair of laterally disposed flaps extending outwardly and longitudinally along opposite sides of said gasket means and adapted for securance to a frame of said greenhouse.