Downdraft or downdraught? To clarify, the difference is, downdraft is American English. Downdraught is British English. As a result of being British we will use the latter. What is downdraught? Downdraught is; “the downward movement of air in the lee of large objects” To come out of the dictionary and to give it some true … Read moreDowndraft or Downdraught? What is it?