Call To Fenesta
  • Home
  • Knowledge Center
  • Glossary

knowledge center


This is your hub for knowledge and information on windows and doors. Over the years, Fenesta has developed a unique understanding of how they work. This knowledge is shared through this section to help you learn what features and materials enable windows and doors to contribute to your home's comfort


UPVC Unplasticized polyvinyl chloride

Casement Window Windows with swinging open-able parts (Sashes)

Horizontal Slider Windows/doors with sliding open-able panels (sashes)

Outer Frame The part of the window fixed to the masonry work

Sash Open-able part of the window/door

Transome Horizontal dividers of window/door outer frame

Mullion Vertical dividers of window/door outer frame

Midrail Dividers (horizontal or vertical) in a window/door sash

Bay Window A combination of three or more windows that projects outward from main walls forming a bay in a room, either square or polygonal

Tilt & Turn Window A window that tilts at an angle for ventilation and opens inwards like a casement

Multi-point locking A locking mechanism that locks at more than one point

Extrusion A process where solid plastics in the form of granules is melted in a heated chamber. The molten plastic is then forced out through a die and then immediately cooled to re-solidify to desired shape

Extruded Profile Sections made through the extrusion process

Fusion Welding A process where members are joined by heating the ends to create a semi solid area and fusing them together

Sill The main horizontal part forming the bottom of the frame of a window

Patio Door A sliding glass door used in a patio area

Rollers Wheels attached to the bottom of the sash of a window or door that allows it to slide easily

STC Sound Transmission Class ‘Higher the STC rating, better is the sound insulation characteristic of the material

Gasket The black rubber strip that runs around the pane of glass in a window to create a weatherproof joints

Reinforcements Steel or aluminium sections are used in the chambers of the UPVC profile to provide necessary strength

Single Glazing Single glass in a window is called single glazing

Double Glazing Use of two panes of glass in a window with a space in between

Triple Glazing Use of three panes of glass in a window with spaces in between

Composite Door Made from Glass reinforced plastic, it is a sturdy and stylish alternative to traditional wooden door

Low 'e' glass Refers to low emissivity glass. It lets in energy from the sun while preventing the heat escape from indoors to outdoors

'U' Value It is a measure of heat loss. Lower the 'u' value, better thermal insulation of the material

Solar Heat Gain Coefficient (SHGC) It measures how well a product blocks heat from the sun. SHGC is expressed as a number between 0 and 1. The lower the SHGC, the better a product is at blocking unwanted heat gain.