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A

Active Door	The primary door in a pair of double doors that operates normally, while the other remains fixed or opens secondarily.
Air Chambers	These are small honeycomb spaces found within the frame and sash, helping to insulate a window.
Air Infiltration	The flow of air through the seals of windows or doors, typically caused by inadequate insulation or worn seals.
Argon Gas	This is a non-toxic gas that is used to replace air between window panes, reducing the heat transfer between panes.
Arched Window	A window with a rounded top, commonly used as a decorative feature in homes with traditional architecture.
Awning Window	An awning window is a type of window that is hinged at the top and opens outward, typically used for ventilation.

B

Bay Window	A bay window is a combination of three or more windows that project outward from a building, creating additional space inside.
Bow Window	Similar to a bay window, the bow window consists of four or more windows forming a curved outward projection.
Brickmould	A trim surrounding the window frame, providing weather protection and securing the unit to the wall.

C

Casement Window	A casement window is hinged at the side that opens outward, like a door.
Casing	Decorative molding that surrounds the perimeter of a door or window, covering the gap between the frame and wall.
Cladding	A protective layer on the exterior of a window frame, usually made of vinyl, aluminum or fiberglass.
Clerestory Window	A tall, narrow window positioned above eye level. Brings in natural light while maintaining privacy.
Condensation	This is moisture that develops on the surface of a window. It can occur on the interior surface (due to indoor humidity) or the exterior surface (due to warm, humid outdoor air meeting cold glass).
Condensation Resistance	The capacity of a window, or door, to prevent moisture build-up on its surfaces.
Conduction/Convection	Conduction is heat loss through window edges, sash, and frame, whereas convection is heat loss as a result of air movement between the window and its glazing.

D

Daylighting	The use of windows to harness natural light. Minimizes the reliance on artificial light in a dwelling.
Door	A barrier used to close off an entrance, typically swings or slides to provide access, security and privacy.
Door Frame	The supporting structure around a door, it ensures stability and proper alignment.
Dormer Window	Commonly used in attics, windows that are installed vertically from a sloped roof. They can add natural light and additional space to upper floors.
Double Glazing	A window with two panes of glass, often with an insulating layer between them, that provides enhanced thermal efficiency compared to single glazed options.
Double Hung Window	A double hung window has two sashes that slide vertically past each other within the frame.
Drip Cap	A strip of material placed above the windows or doors at an angle to divert water away from the frame.

E

EcoSmart Glass	Triple-pane, double-argon chamber-filled, low-E windows that are sold exclusively through EcoTech Windows & Doors. EcoSmart glass helps to offset the cost of rising energy bills by providing superior energy-efficiency compared to competitor’s windows.
Egress Window	A window that provides a means of escape in case of an emergency. Often required in bedrooms or basement living areas.
Energy Star	This is the government program that establishes the quality standards for energy efficiency for windows and other products.
Entry Door	A door designed for accessing the exterior of a home, built for durability and security.
Entryway	The main access point of a home or building, typically featuring a door, sidelight windows, and decorative elements.

F

Factory Direct Pricing	When window companies manufacture their windows and work based on volume, consumers are able to receive more competitive pricing.
	A term encompassing the design, construction, and placement of windows in a building.
Fixed Window	A non-operable window. Used for natural light and views, not ventilation.
Flashing	A water-resistant material installed around windows and doors to prevent water or air infiltration.
French Doors	A pair of doors with glass panels that extend for most of their length, allowing light to pass through. Often used as an alternative for sliding patio doors.

G

Garage Door	A garage door is a large, exterior door that opens manually or via a motorized system, typically made of steel or fiberglass.
Garden Window	A small, bay window that is typically located above the kitchen sink. Allows for growing plants indoors.
Gas Fill	A feature in modern windows where argon, krypton, or other gases are used between panes to improve thermal insulation.
Glazing	This is the process of sealing glass to the window sash.
Grills	These are horizontal or vertical bars that are commonly installed between the glass panes, usually for decorative purposes.

H

Head / Header	The horizontal part at the top of a window or door frame.
Hinge	A piece of hardware that connects a door or window to its frame. Allows for the window or door to swing open or closed.
Hopper Window	Commonly used in basements, this is a window that opens upwards.
Hung Window	A hung window is a vertically sliding window with one operable sash in single-hung designs or two independently operable sashes in double-hung designs.

I

Insulated Door	Commonly made with fiberglass or steel, a door with an insulated core to improve energy efficiency.
Insulated Glass Unit (IGU)	Two, or more, panes of glass separated by a spacer and sealed to form a single window unit.
In-Swing Door	A door that opens inward.

J

Jamb (Window or Door)	This is the vertical section of the main window or drame frame. It holds the sash or door in place.
Jamb Extension	An addition piece added to the jamb to acommodate thicker walls.

K

Krypton Gas	An inert gas, denser than argon, used between window panes for superior insulation.
Kick Plate	A metal or plastic plate installed at the bottom of a door to protect it from damage.

L

Laminated Glass	Glass made with layers of plastic between sheets of glass, offering improved security and sound insulation.
Low-Emissivity (Low-E) Glass Coating	This is a thin metallic layer that is applied to the window surface to help reflect the sun’s rays and energy, helping to reduce the impact of exterior.

M

Mullion	A vertical, or horizontal, bar between window units that provides additional structural support.
Multi-point Locking System	A window and door locking mechanism that secures the window or door at multiple points along the frame for increased security.
Muntins (or Grids)	Dividers that create a grid pattern on windows, often found in traditional-style designs. They can be either between the panes of glass, or applied to the exterior.

N

NFRC Label

National Fenestration Rating Council label that details a window’s energy efficiency, including U-factor and SHGC.

O

Obscure Glass	This is glass that is manufactured to be translucent. Also known as Privacy Glass.
Operable Window	A window that is able to open for ventilation, unlike Fixed Windows.
Operator	The mechanism used to open and close a window.

P

Pane	The term for a single sheet of glass within a window or door.
Passive Solar Gain	The use of windows to capture sunlight and reduce heating costs during colder months.
Patio Door	A door designed for access to outdoor spaces like patios, terraces, or gardens, typically large with glass panels that enhance natural light and offer an unobstructed view of the exterior.
Picture Window	A large, fixed window designed to provide an unobstructed view.

Q

R

R-Value	R-value measures the resistance a material has to heat. The higher the R-value, the greater resistance it offers, making it a better insulator.
Replacement Window	A window that is installed into an existing frame to replace an old or damaged window, allowing for upgrades without altering the surrounding structure.
Rough Opening	The designated space in a wall where a window or door will be installed, prior to the addition of the frame.

S

Sash	This is the window component which contains the glass.
Shims	These are two inch wide wedges that are used to position the window into the window opening. They ensure the installed window is square and flush.
Sidelight	A narrow window panel installed on one or both sides of an entry door.
Sill	This is the bottom section of the main window frame. It commonly has a 2-3 inch lip.
Sliding Door	Often used for patio doors, doors that slide on a track.
Sliding Window	Windows that open and move horizontally along a track making them easy to operate.
Solar Gain	The amount of heat which has passed through the glass of windows and doors and has collected inside of the home.
Sound Transmission Class (STC)	A rating system for sound insulation. Higher STC ratings indicate products have better noise reduction.
Spacer	A material placed between panes of glass in an IGU to maintain consistent spacing and improve energy efficiency.
Super Spacer	EcoTech’s innovative warm-edged spacer system, made of high-quality silicon foam, that reduces heat and noise transfer compared to traditional metal spacers.

T

Tempered Glass	This is glass which breaks into small pieces rather than shards when broken. It is used to help prevent cuts and injuries as a result of broken glass.
Thermal Break	This is a form of insulation that is used to slow down the transfer of heat through your windows.
Thermal Expansion	The tendency of window materials to expand and contract with changes in temperature.
Threshold	The bottom part of the door frame. To improve weather resistance, this part is often slightly raised.
Tilt and Turn Window	A casement window that can also be tilted inwards for cleaning.
Tilt Latch	This is the window mechanism that unlocks the sash. It allows the window to tilt.
Transom Window	A small window located above a door or another window, often used for ventilation or decorative purposes./td>
Triple Glazing	Three layers of glass with two spacers, providing excellent insulation and energy efficiency.

U

U-Value

This is a measurement that shows the amount of heat transferred, with the lower the U-value, the better insulation of the window.

V

Vinyl Window	Windows with frames made of PVC (polyvinyl chloride), known for low maintenance and good insulation properties.
Visible Transmittance (VT)	A measurement of the visible light that passes through a window. A higher VT will allow more light.

W

Weatherstripping	This is the material that is used to form a weather-resistant seal. Its most common used in the winter and applied around the window sash to prevent air and water leakage.
Weep Hole	Small openings at the base of a window, or door, frame to aide in water drainage.
Window Stop	A strip of wood or metal used to hold the window sash or glass panel in place within the frame.
Wind Load	The force exerted on a window due to wind pressure, an important consideration in design and installation.

X

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Zoning

A technique to design window placement and glazing to optimize natural light and energy efficiency in different areas of a building.

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