This topic includes information related to vents installed during construction.  Vents provide air movement and ventilation for a variety of spaces within a structure.  They are not mechanical, rather they rely on the passive principles to cool a space.  Vents should also prevent the undesirable elements, such as rain, snow and debris from entering into a space.  Spaces that are typically ventilated in a residential structure include the attic and crawlspace.

Configurations of louvers include horizontal louvers, with blades arranged horizontally, and vertical louvers with blades running vertically. They may have fixed blades or adjustable blades. Blades may be formed from steel or aluminum sheet or made of aluminum extrusions.