What is the first step to take prior to using a draft gauge?

Prior to using a draft gauge, zeroing it out is crucial for obtaining accurate readings. This process involves ensuring that the device reads zero when there is no pressure difference being measured. If the gauge is not zeroed out, any subsequent measurements can be misleading, as they would include the inherent bias from the gauge’s current calibration state. Starting from a zero reference point helps establish a baseline for the measurements, allowing for a more precise understanding of the draft conditions being evaluated. Properly zeroing the gauge is fundamental in ensuring reliable, valid data collection during inspections or monitoring processes.