How do gas-fired furnace designs differ from oil-fired designs?

Gas-fired furnace designs are characterized by their ability to provide more uniform furnace temperatures compared to oil-fired designs. This uniformity is largely due to the combustion characteristics of gas. Gas tends to burn more cleanly and evenly than oil, which can sometimes have issues with liquid fuel distribution and incomplete combustion.

In a gas-fired system, the flue gases that are produced are often at a more consistent temperature and travel through the furnace in a more uniform manner. This leads to better heat distribution throughout the furnace chamber, allowing for steadier and more consistent temperatures. This feature is particularly beneficial in many industrial processes where maintaining a uniform temperature is crucial for product quality or safety.

The other options suggest design differences that do not accurately represent typical characteristics of gas versus oil furnace designs. For instance, gas-fired furnaces do not inherently require larger volumes nor do they significantly improve localized heat absorption rates compared to oil furnaces. Additionally, they are not designed specifically to generate more steam per hour; steam generation capabilities depend on various factors including the type of fuel used and the efficiency of the overall system design rather than being a definitive feature of the furnace type itself.