Seals Due to variation in stress concerning the IGU and the outside, seals are designed in the IGU to equalize tension. Window Sash Substitute Kits In the event the window sash breaks, it is feasible to acquire a sash alternative package. This avoids the expense and mess of whole window https://kameronqhwly.elbloglibre.com/36072741/details-fiction-and-sash-windows