What should be done immediately if a gas odor is detected near a gas furnace?

If a gas odor is detected near a gas furnace, the immediate and appropriate action is to turn off the furnace and exit the building. This response is vital for ensuring safety, as a gas leak can pose serious hazards such as fire or explosion. By turning off the furnace, you are attempting to minimize the source of potential ignition and take proactive steps to avoid further danger.

Leaving the building is equally important because it removes individuals from a potentially life-threatening environment. It's critical to prioritize safety and to alert emergency services to handle the situation properly.

While venting the area might seem like a reasonable option, it’s less effective if there is a significant gas leak that could lead to serious consequences. Using air freshener does not address the danger of gas and could create further hazards by masking the smell, which is crucial for detecting gas leaks. Continuing to use the furnace under such circumstances is irresponsible and poses a significant risk to life and property.