Abstract: A defrost airflow assembly for a heating, ventilation, and air-conditioning (HVAC) case, having a defrost channel starting in a mixing chamber and terminating in a defrost outlet with a defrost door, a demist channel starting in the mixing chamber and terminating in a demist outlet with a demist door, and a bypass channel connected directly with the pre-door defrost channel, the post-door defrost channel, the pre-door demist channel and post-door demist channel. The first bypass channel is configured to allow airflow from the mixing chamber to the defrost outlet when the defrost door is in the closed position and the demist door is in the open position.

Abstract: A defrost airflow assembly for a heating, ventilation, and air-conditioning (HVAC) case, having a defrost channel starting in a mixing chamber and terminating in a defrost outlet with a defrost door, a demist channel starting in the mixing chamber and terminating in a demist outlet with a demist door, and a bypass channel connected directly with the post-door defrost channel and the post-door demist channel, and indirectly with the pre-door demist channel and the pre-door defrost channel. The first bypass channel is configured to allow airflow from the mixing chamber to the defrost outlet when the defrost door is in the closed position and the demist door is in the open position.

Abstract: A blower device for a heating, ventilation and air conditioning system, including: a blower housing defining an internal volume with an inlet and an outlet; a blower wheel with blower blades, arranged within the internal volume of the blower housing; a motor configured to rotate the blower wheel in a first direction around a central axis; a preswirler arranged within the inlet upstream of the blower wheel and including a plurality of vanes extending towards the blower wheel. Each vane of the plurality of vanes includes a first section and a second section, both extending along the central axis toward the blower wheel, with the second section being closer to the blower wheel than the first section is. The vanes of the plurality of vanes slope in a second direction as they extend along the central axis towards the blower wheel, the second direction being opposite to the first direction.

Abstract: A blower device for a heating, ventilation and air conditioning system, including: a blower housing defining an internal volume with an inlet and an outlet; a blower wheel with blower blades, arranged within the internal volume of the blower housing; a motor configured to rotate the blower wheel in a first direction around a central axis; a preswirler arranged within the inlet upstream of the blower wheel and including a plurality of vanes extending towards the blower wheel. Each vane of the plurality of vanes includes a first section and a second section, both extending along the central axis toward the blower wheel, with the second section being closer to the blower wheel than the first section is. The vanes of the plurality of vanes slope in a second direction as they extend along the central axis towards the blower wheel, the second direction being opposite to the first direction.

Abstract: An HVAC unit including: a case defining a first aperture, a second aperture, a third aperture, and an outlet aperture, a first door rotatably attached to the case, a second door, rotatably attached to the case, and a third door rotatably attached to the case, with the first door being arranged to partially allow the exterior airflow in its closed position.

Abstract: A defrost airflow assembly for a heating, ventilation, and air-conditioning (HVAC) case, having a defrost channel starting in a mixing chamber and terminating in a defrost outlet with a defrost door, a demist channel starting in the mixing chamber and terminating in a demist outlet with a demist door, and a bypass channel connected directly with the pre-door defrost channel, the post-door defrost channel, the pre-door demist channel and post-door demist channel. The first bypass channel is configured to allow airflow from the mixing chamber to the defrost outlet when the defrost door is in the closed position and the demist door is in the open position.

Abstract: A defrost airflow assembly for a heating, ventilation, and air-conditioning (HVAC) case, having a defrost channel starting in a mixing chamber and terminating in a defrost outlet with a defrost door, a demist channel starting in the mixing chamber and terminating in a demist outlet with a demist door, and a bypass channel connected directly with the post-door defrost channel and the post-door demist channel, and indirectly with the pre-door demist channel and the pre-door defrost channel. The first bypass channel is configured to allow airflow from the mixing chamber to the defrost outlet when the defrost door is in the closed position and the demist door is in the open position.

Abstract: A method and apparatus for removing tubulars from a wellbore is disclosed. A lifting member grips the tubular and applies a lifting force. The lifting force is then transferred to a first surface. The lifting member is monitored and when the capacity of the first surface is reached a force transfer assembly is activated. The force transfer assembly transfers the lifting load between the first surface and a second surface. The lifting member and force transfer assembly are then adjusted to maximize the amount of lifting force applied to the tubular.