Fenestrerende

Fenestrerende is a Danish term meaning the act of fenestrating, i.e., creating fenestrae or openings such as windows in a structure, or more generally introducing openings in a design. The word derives from fenestra, the Latin for window. In some contexts it is used to describe processes that involve making or increasing openings.

In architecture, fenstrering (fenestration) refers to the design and arrangement of openings on a building façade, including windows, doors, skylights, and curtain walls. It influences daylight distribution, ventilation, acoustics, thermal performance, and views. Key considerations include proportions and rhythm on the façade, alignment with structural grids, choice of frame and glazing materials, weather sealing, solar gain, energy standards, and compliance with safety and building codes. Fenestration design aims to balance visual appeal with performance and occupant comfort, while supporting exterior envelope integrity.

In anatomy and physiology, fenestration describes the presence of fenestrae—microscopic pores—in the endothelial lining of capillaries. Fenestrated capillaries have pores that increase permeability to small molecules, facilitating rapid exchange between blood and surrounding tissues. They occur in organs such as the kidney, endocrine glands, intestinal mucosa, and choroid plexus; the central nervous system generally relies on non-fenestrated endothelium due to the blood–brain barrier. The exact size and presence of diaphragms over the pores can vary by tissue.

Overall, fenestrering or fenestration is a term used in both architecture and biology to denote the creation or presence of openings that affect exchange, light, or fluid movement, with context clarifying its specific meaning.