Progressive Windows

This will help to familiarize you with the terminology used both on this site and when you when discussing windows with us. A colorless and odorless gas used to fill the airspace between two pieces of glass in a dual glazed unit. The addition of argon greatly increases the performance of Low-E Glass. A moulding applied to the stile of a French Door, Sliding French Door or French Casement window unit which the other door panel or window sash strikes. Usually head and footbolt devices will be found on the astragal side.