Abstract: Example embodiments of the present disclosure relate to improved HVAC devices and kits for HVAC devices that improve the sound attenuation associated with the device, particularly low-frequency noise. An example embodiment includes an improved furnace including a housing with a combustion air chamber, a heat exchanger chamber, and a circulation blower chamber, wherein the combustion air chamber comprises a burner assembly and a combustion air fan, the furnace also includes a sound attenuation layer including a first acoustic metamaterial layer coupled to the combustion air chamber and tuned to attenuate sound for a first frequency band, one or more housing openings fluidly connecting the combustion air chamber to an environment outside the housing, wherein the sound attenuation layer includes a discontinuous section that aligns with one or more of the housing openings.

Abstract: Example embodiments of the present disclosure relate to improved HVAC devices and kits for HVAC devices that improve the sound attenuation associated with the device, particularly low-frequency noise. An example embodiment includes an improved furnace including a housing with a combustion air chamber, a heat exchanger chamber, and a circulation blower chamber, wherein the combustion air chamber comprises a burner assembly and a combustion air fan, the furnace also includes a sound attenuation layer including a first acoustic metamaterial layer coupled to the combustion air chamber and tuned to attenuate sound for a first frequency band, one or more housing openings fluidly connecting the combustion air chamber to an environment outside the housing, wherein the sound attenuation layer includes a discontinuous section that aligns with one or more of the housing openings.

Abstract: Example embodiments of the present disclosure relate to improved HVAC devices and kits for HVAC devices that improve the sound attenuation associated with the device, particularly low-frequency noise. An example embodiment includes an improved furnace including a housing with a combustion air chamber, a heat exchanger chamber, and a circulation blower chamber, wherein the combustion air chamber comprises a burner assembly and a combustion air fan, the furnace also includes a sound attenuation layer including a first acoustic metamaterial layer coupled to the combustion air chamber and tuned to attenuate sound for a first frequency band, one or more housing openings fluidly connecting the combustion air chamber to an environment outside the housing, wherein the sound attenuation layer includes a discontinuous section that aligns with one or more of the housing openings.

Abstract: A system which may enable users to plan, design and observe various building systems in an abstract and intuitive view, such as with a map view. In this view, virtually all facility information and objects may be displayed as simple shapes (e.g., rectangles). Just by some drag-and-drop, a user may provide shapes and rearrange positions of these shapes quickly to reflect a desired space relationship. Objects (e.g., components, devices, controllers, and the like) may be placed, moved around, and associated with each other on a facility layer or floor. Further, the map view may be used together with a tree view and a list view to provide alternative design ways. Changes made in any of the views may be synchronized with the other views. Various presentations of the facility may be provided.

Abstract: A system which may enable users to plan, design and observe various building systems in an abstract and intuitive view, such as with a map view. In this view, virtually all facility information and objects may be displayed as simple shapes (e.g., rectangles). Just by some drag-and-drop, a user may provide shapes and rearrange positions of these shapes quickly to reflect a desired space relationship. Objects (e.g., components, devices, controllers, and the like) may be placed, moved around, and associated with each other on a facility layer or floor. Further, the map view may be used together with a tree view and a list view to provide alternative design ways. Changes made in any of the views may be synchronized with the other views. Various presentations of the facility may be provided.