TEMPLATE: C3

Glossary

Learn the parts of your Pella window.



1. Frame

The combination of the head, jambs and sill that forms a precise opening in which a window sash fits.

2. Glass

A framed sheet of glass within a window frame.

3. Grilles

Any bar that divides window glass into smaller panes. Also called a muntin, grid or windowpane divider.

4. Head

The main horizontal part forming the top of the window frame.

5. Jamb

The main vertical parts forming the sides of a window frame.

6. Sash

A single assembly of stiles and rails made into a frame for holding glass.

7. Sill

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

More Parts

Aluminum clad

Exterior wood parts covered with extruded aluminum, with a factory-applied finish to deter the elements.

Argon

An inert, nontoxic gas used in insulating glass units to reduce heat transfer.

Balance

A mechanical device (normally spring-loaded) used in single- and double-hung windows as a means of counterbalancing the weight of the sash during opening and closing.

Casing

Exposed molding or framing around a window or door, on either the inside or outside, to cover the space between the window frame or jamb and the wall.

Check rail

The bottom horizontal member of the upper sash and the top horizontal member of the lower sash which meet at the middle of a double-hung window.

Emergency exit window

Fire escape window (egress window) large enough for a person to climb out. In U.S. building codes, each bedroom must be provided with an exit window. The exact width, area, and height from the floor are specified in local building codes.

Fixed panel

An inoperable panel of a sliding window.

Frame

The combination of the head, jambs and sill that forms a precise opening in which a window sash fits.

Glass

A framed sheet of glass within a window frame.

Grilles

Any bar that divides window glass into smaller panes. Also called a muntin, grid or windowpane divider.

Head

The main horizontal part forming the top of the window frame.

Integrated Crank with Fold-Away Handle

A window crank that folds in on itself, improving operation and aesthetics by not interfering with roomside window treatments.

Jamb

The main vertical parts forming the sides of a window frame.

Lift

Handle for raising the lower sash in a double-hung window. Also called sash lift.

Lock handle

A locking mechanism located on the handle of a window.

Mullion

A major structural vertical or horizontal member to combine two or more windows together.

Operator

Crank-operated device for opening and closing casement or awning windows.

Rail

Horizontal member of a window sash on a double-hung or single-hung.

Sash

A single assembly of stiles and rails made into a frame for holding glass.

Sash lock strike

A lock attached to the sashes of a double hung window that can fix both in the shut position. Secures window and reduces rattling.

Screen

Woven mesh of metal, plastic, or fiberglass stretched over a window opening to permit air to pass through, but not insects.

Screen strike

A device fixed in or on a screen into which the lock or latch bolt engages when the window is closed.

Sill

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

SureLock®

Pella patented window operating system that reaches out to pull the window sash against the weatherstripping for a tight seal.

Vent

The movable framework or sash in a glazed window that is hinged or pivoted to swing open.

Weatherstripping

A strip of resilient material for covering the joint between the window sash and frame in order to reduce air leaks and prevent water from entering the structure.

Weep Holes

The individual openings provided in the window sill to allow water or condensation to escape.

Weep System

A series of tiny openings in the sill that allow unwanted moisture to drain to the outside.

Egress window

A window big enough and low enough to the ground — per local building codes — that allows occupants to escape through the opening in an emergency, such as a fire.

Hinged glass panel

The roomside glass panel on Designer Series® windows and patio doors that opens to allow access to our snap-in between-the-glass blinds, shades, decorative panels and grilles.

Dust pads

Small, cloth-like pads used to seal the gap at the corner of a window or door.

Gaskets

Rubber strips applied to the top and sides of doors, and into double-hung and sliding window channels, to seal out air and water.

Mortise and Tenon Joint

A joint where one piece of wood is inserted into the other.

Blocking Resistance

The capability of a paint, when applied to two surfaces that touch, not to stick to itself.

Shim

A shim is a thin and often tapered or wedged piece of material, used to fill small gaps or spaces between objects.

Jambliner

A strip which goes on the sides of a window frame to provide a snug fit for the sash.

Lock strike

The opening that receives the bolt of a window or door lock.

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