Abstract: Recording og forced eexpiration from tidal breathing referred to as forced expiratory capacity (fec) and its volume for first sec. Referred to as (fec1) appears to be a simple convenient technique than the conventional forced vital capacity manuevre(fvc). From fec tracings volume expelled for the first sec and its % can be measured (fec1%) such spirometric recording obtained from tidal breathing to residual volume may be referred to as spirometric recording at low lung volume. Asthmatics and old subjects find this manuevre easier to perform than the conventional manuvre of forced vital capacity (fvc) fec recording offers no discomfort to subjects as it does not involve maximal inspiration before forced expiratory effort in its procedure as seen in conventional spirometry recording of FVC. FEC recording is a simple, reliable and sensitive test for evaluation of early airway obstruction in asymptomatic smokers and therefore may be utilised in clinical and epidemiological survey.