GLOSSARY OF WINDOW TERMS The Learning Center Molding An ornamental exterior trim around the perimeter of a frame. Mortise A slot or rectangular cavity cut into a piece of wood to receive another part. Mortise-and-Tenon A strong wood joint made by fitting together a mortise in one board and a matching projecting member (tenon) in the other. Mullion The vertical or horizontal divisions or joints between single windows in a multiple window unit. Mullion Casing An interior or exterior casing member to cover the mullion joint between single windows. Muntins Also called "grids" or "grilles." The decorative bars that divide the glass part of a window up and create a pattern. With most newer windows, muntins are located between the panes of glass. Molding - Passive Solar Collector New Construction Also called nail-on frames, this type of frame installation is used for new construction where the window frame is nailed to the studs. NFRC National Fenestration Rating Council - a nonprofit public/private collaboration that provides contractors and homeowners with a standardized energy-performance rating system for fenestration products. Obscure Glass A type of glass meant to camouflage a window. Often used in bathrooms. Styles include: rainglass, glue chip, reed glass and several others. Panel Usually refers to the separate panel or panels in a door frame. Passive Solar Collector Any glazed area in the walls or roof of a building pointed to the south to take maximum advantage of the sun's heat without a mechanical (or active) method of storage or distribution of the heat. < previous main menu       next > 1-877-SWING CLEAN info@energyswingwindows.com 3245 Miracle Drive Murrysville, PA 15668 724-387-2991 PA Contractor ID PA001856