This is a planning estimate. Confirm the final selection with a site survey and a stamped calculation.

Project and site

Elevation sets barometric pressure, which changes air density and grains of moisture per pound of air.

Design conditions

Enter temperature and one humidity value for each condition. Use the hottest, most humid outdoor condition you plan to design for. Adjacent spaces are optional, and each source below can be tied to any of them.

Room, pressure, and allowances

How this is calculated, and how far to trust each default