Abstract: Certain aspects involve a lighting system including a compressible gasket. The gasket can include front and back surfaces and at least one substantially rigid support embedded within the gasket. The embedded support can be positioned within the gasket so as not to be exposed on the front or back surfaces of the gasket.

Abstract: A furnace has a cabinet having at least one wall at least partially defining an interior space of the cabinet, a heat exchanger disposed in the interior space, and a protrusion formed integrally with the at least one wall, the protrusion extending generally inward into the furnace to at least partially obstruct a circulation airflow through the cabinet.

Abstract: Systems and methods are disclosed which may include (1) providing a preselected and/or non-uniform airflow distribution output from a heat exchanger, (2) selectively directing air through a relatively lower resistance flowpath to manage an airflow characteristic and/or distribution downstream of the heat exchanger, (3) providing an HVAC system comprising a heat exchanger comprising a fin arrangement configured to cause relatively more air to contact a selected component that lies either upstream or downstream relative to the heat exchanger, and (4) receiving a relatively uniform airflow into a heat exchanger and outputting an airflow comprising a localized increased airflow rate. A heat exchanger comprising differentiated resistance flowpaths may selectively affect a direction and/or localized flow rate or distribution of an airflow exiting the heat exchanger.

Abstract: A heating, ventilation, and/or air conditioning (HVAC) system may include a heat exchanger comprising at least one heat exchanger tube. The heat exchanger tube may include multiple passes: a first pass, a second pass having an elliptical portion with ribs disposed in the elliptical portion, a third pass having an elliptical portion with ribs disposed in the elliptical portion, and a fourth pass having an elliptical portion with ribs disposed in the elliptical portion. The first pass and the second pass may be connected in fluid communication by a first bend, the second pass and the third pass may be connected in fluid communication by a second bend, and the third pass and the fourth pass may be connected in fluid communication by a third bend. The heat exchanger tube may be configured to promote heat transfer while also controlling a pressure drop across the heat exchanger tube.

Abstract: A heating, ventilation, and/or air conditioning (HVAC) system may include a heat exchanger comprising at least one heat exchanger tube. The heat exchanger tube may include multiple passes: a first pass, a second pass having an elliptical portion with dimples disposed in the elliptical portion, and a third pass having an elliptical portion with dimples disposed in the elliptical portion. The first pass and the second pass may be connected in fluid communication by a first bend, and the second pass and the third pass may be connected in fluid communication by a second bend. The heat exchanger tube may be configured to promote heat transfer while also controlling a pressure drop across the heat exchanger tube.

Abstract: A furnace has a cabinet having at least one wall at least partially defining an interior space of the cabinet, a heat exchanger disposed in the interior space, and a protrusion formed integrally with the at least one wall, the protrusion extending generally inward into the furnace to at least partially obstruct a circulation airflow through the cabinet.

Abstract: Systems and methods are disclosed which may include (1) providing a preselected and/or non-uniform airflow distribution output from a heat exchanger, (2) selectively directing air through a relatively lower resistance flowpath to manage an airflow characteristic and/or distribution downstream of the heat exchanger, (3) providing an HVAC system comprising a heat exchanger comprising a fin arrangement configured to cause relatively more air to contact a selected component that lies either upstream or downstream relative to the heat exchanger, and (4) receiving a relatively uniform airflow into a heat exchanger and outputting an airflow comprising a localized increased airflow rate. A heat exchanger comprising differentiated resistance flowpaths may selectively affect a direction and/or localized flow rate or distribution of an airflow exiting the heat exchanger.