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Provide occupants access to fresh air for increased productivity and energy savings, using natural pressure and/or thermal differentials between supply and exhaust locations.

Operable windows, curtain-wall-integrated louvers, high ceilings, atria, light wells, strategic thermal and/or solar chimneys and evaporative cooling towers.

Fresh air is drawn from outside into occupied space and is exhausted with contaminants to the outside at a different location. The client and design team establishes minimum and maximum acceptable indoor temperature values as a baseline for the ventilation design and engineering.

Reduced first cost due to smaller mechanical equipment. Lower operational cost due to reduced mechanical ventilation cost, higher performance, less absenteeism. Higher first costs of operable window systems and controls.

Access to outside air, improved health, higher performance, less absenteeism, and less operational cost.

Moderately warm to cool climates. Naturally ventilated buildings should be narrow. Maximum distance from air supply location not to exceed 15’ (5m). Each room should have separate supply and exhaust openings: Air exhausts are to be located high above inlets, taking advantage of thermodynamics. Facade openings are to be placed apart from each other to maximize mixing within the room while minimizing the obstructions to airflow within the room.

1.1.3 Building Orientation
1.1.4 Skin to Core Distance
1.2.2, 1.2.4, 1.2.5, 1.2.8 Displacement, Cross, Stack, & Hybrid Ventilation
1.2.7 Skygardens
1.3.1 Daylighting
5.1.2 Air Flow Modeling