D
Daylight TransmittanceThe percentage of visible light that glazing transmits through a window. A standard clear dual- pane has a daylight transmittance of 82%.
DeadboltLocking mechanism for an entrance door or other door, in which a bolt moves with a turn of a key into a jamb. Deadbolts can be a single cylinder or double cylinder. With a single cylinder deadbolt, a key is used on one side, and is turned by hand on the other side. With a double cylinder deadbolt, a key is used on both sides.
DeadliteA piece of glass or insulated glass unit with a sash profile around it; not set within the main frame of a window unit.
DesiccantA porous crystalline substance used to absorb moisture and/or sealant solvents from within the sealed air space of an insulating glass unit. A material used in insulating glass to absorb water vapor which causes fogging. SWISCO spacer is filled with desiccant along with butyl to manufacture our insulated glass.
Divided LightA pattern of muntin bars using horizontal and vertical members to form a "tic tac toe" design on a light of glass. Originally, these crossed muntins divided a single glazed light into smaller pieces (called true colonial). Insulated glass can have the muntin bars placed between the panes of glass (called internal muntins) or attached as a grid on the inner side of the structure, but not outside the insulated glass light itself (called external muntins). Divided light windows are sometimes referred to Colonial Lite, "Cut Up" windows or True Colonial.
Door StopA door stop is the small piece of wood, usually 1 3/8" - 1 1/2" wide, that is attached to the door jambs on both sides and on top of the door. This strip of wood is where the door comes to rest when it is closed. It stops the door from moving any further, and also covers the gap that would otherwise appear between the door and the jambs.
Door ViewerItem that is inserted into a hole drilled into the face of a door. Viewer has a curved lens in it to magnify an image on the other side of the door. Viewers are made with various degrees of field of vision.
Double GlazingUse of two panes of glass in a window to increase energy efficiency and provide other performance benefits.
Double-hung WindowA window unit that has two operable sashes which move vertically in the frame. Two vertically sliding sash which by-pass each other in a single frame. Sashes typically fit within vinyl balances and tilt out and remove for safe, easy cleaning.
Drop In GlazingA type of glazing that attaches directly to the glazing leg in the sash and frame members using glazing compounds or adhesive and glazing bead.
Dual Durometer BeadA vinyl glazing bead with a softer flap against glass and a harder section inserted into sash member.
Dual WindowTwo windows joined together, one in front of the other, to provide superior sound control.
Dummy PairsDummy pairs are for doors where no latches are needed. These knobs or levers do not turn. They can be split up for bi-fold door set, since no hardware is needed on back of the bi-folds. Dummy pairs can also be used on double french door units, where ballcatches are used to hold doors in place. Dummy Pairs do not require a standard hole to be drilled, since most are attached from each side of the door.
