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Sound Comparison

When you ask for a sound rating of a gas furnace today, you're liable to get just about anything. That is because there is no industry-wide standard for rating the sound of an operating gas furnace. Consequently, different manufacturers use different testing procedures. Different airflows, duct configurations, building construction, and especially the firing rate of the furnace cause dramatic and detectable differences in sound readings or perceived sound levels.

For example, a manufacturer might claim to have "the quietest furnace" when comparing high-fire sound levels on two-stage furnaces, despite the fact that the furnace spends less than 20% of its operating time at high-fire. The rest of the time the furnace is operating in low-fire, where it might not necessarily have an advantage. How can you break through all the clutter about sound claims? This tool provides a relative sound comparison of a number of different furnaces in the same operating environment and operating at different firing rates—also known as "capacities" or "output levels."

This tool should only be used as a comparison device that means that it should be used to compare how different furnaces sound in this simulated home installation in comparison to one another. Further, this tool won't give you a precise idea of the sound level of a furnace in your home as the sound level is dependent on the volume level during the playback on your computer. In addition, the actual sound level of a furnace and how it will sound in your home will vary based upon where it's installed, what kind of ductwork you have, and a variety of other operating conditions.


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