ZONE ANALYSIS OF FIRE IMPERVIOUSNESS OF AN AIR GTE FAN HOUSING
Nowadays fire certification tests are carried out not on full-size fan housings, but on its separate components, which are most vulnerable for the fire impact. Successful results of fire tests of components extend to all fan housing. The paper considers principles of the most fire-vulnerable zones selection on the basis of material thickness, existence of finning or ribbing, cooling, the heat-protective and abraded coverings, etc. The paper proves that existence of elements in the form of thickenings, fins or ribs on a fan housing enhances its resistance to burn-through, and tests of flat plates of the smallest thickness will be the most critical.