SYNOPSISThe effect of ambient air flow on the burning behavior of thirty-one fabrics varying in fiber type, fabric construction and weight, was evaluated with an isoperibol calorimeter. An extensive calibration was carried out at five (5) different air flow rates ranging from 4 to 15 cm/sec, to verify the response of the calorimeter as theoretically predicted.Results on the heat release and the residue yield of the fabrics, at four (4) different flow rates, indicated that varying ambient air flow has significantly different effects on the burning of these fabrics, depending on their fiber content. Furthermore, results, in most cases, are interpretable in terms of a simplified cyclic model of burning and existing knowledge on the degradation and combustion behavior of the fibers involved.