Design Development

By increasing glazing and designing for natural light, projects can reduce the number of ambient light fixtures or the frequency with which they are used, reducing the cost of electric lighting both upfront and for ongoing operations.

Identify available products and furniture that combine glazing and building elements for optimum access to views while maintaining privacy—for example, workstations with low partition heights and interior perimeter glazing.

Explore a combination of strategies that increase views such as low-partition furniture, space-planning techniques, and interior glazing.

In naturally ventilated multifamily buildings, air

The surface area of window openings must, for compliance with ASHRAE 62.1, be equal to or greater than 4% of the occupied floor area that the design considers naturally ventilated. Multiple windows in aggregate can provide the operable area needed to meet the requirements.

The calculation for operable openings will only apply to the floor area adjacent to the window—25 feet to either side and in front of the opening.

Continue to run calculations and develop flow diagrams to inform the design process and confirm compliance. If you are using a natural ventilation modeler for the project, use the model as a tool to inform design development.

Case 2: Naturally Ventilated Spaces

For Core and Shell projects, the space occupant densities used to determine the number of full time equivalent (

The Ventilation Rate Procedure calculation includes occupancy counts based on space types.