All glass, including safety glass, carries some potential of danger in handling. For safety reasons always use protective eyewear and gloves, in a well lit area when working with glass.
Removing the Existing Opening Pane:
Remove the screen assembly (see appropriate section - Screen Replacement and Re-Screening).
Removing the Vent Glass:
Carefully pry out the vinyl glazing bead by separating it from the frame with a putty knife. Once an end is loose, it can be pulled out. Remove remaining pieces the same way. If the glass is intact, carefully pry it loose from its bedding. If the bedding is hard, it can be softened using an electric hair dryer. Since this glass can be non-safety, wear gloves and safety glasses while working with it. If there are glass spacers between the glass edge and frame, set them aside for re-use. After the glass is out, clean the glazing ledge of the frame, so that the new glass will adhere evenly.
Installing the New Glass:
Lay down a even bead of bedding on the glazing ledge. There are many suitable, non-hardening types of bedding available from glass shops, auto supply houses, and home center stores. Do not use too thick of a bead. It will have to compress in order to reinstall the gazing vinyl. Place the new glass into the prepared space, pressing down evenly on the glass edge.
Installing the Vinyl Glazing Bead:
This process will be easier if the bead is warm and moist. Soaking it in hot soapy water will work for this. Fit the bead snugly into the corner between the glass and frame. Roll and push the bead backward into the groove, so that is does not stretch. A round end plastic handle, such as on a screwdriver, can help to force the bead into place. apply all pieces the same way. Check to see that they are properly seated. Clean up.