Draft Risk Assessment Calculator

Assess draft risk and local discomfort from air movement per ASHRAE 55.

Air temperature at location.
°F
Average air velocity at location.
FPM
Ratio of velocity fluctuation to mean (typically 0.3-0.6).
ratio

Results

Draft Rating (DR)-%
Discomfort Risk Level-
Max Acceptable Velocity-FPM
References: ASHRAE Standard 55, Section 5.2.5 (Local Thermal Discomfort)