A heating, ventilation, and air conditioning (HVAC) door assembly includes a first HVAC door rotating about a first axis, a second HVAC door rotating about a second axis that is nonparallel with the first axis, an actuator, a mode cam. The mode cam is engaged with the actuator and controls movement of the first HVAC door and the second HVAC door.

Disclosed herein is an air conditioner capable of guiding air in a desired direction with an adjusted speed without marring the appearance to solve the above-described problems. An air conditioner comprising a ceiling-embedded type indoor unit configured to discharge air into an indoor room through an air outlet simultaneously sucking indoor air through an air inlet, wherein a air conditioner comprises, a main flap configured to guide a direction of air discharged from a air outlet in a preset direction, and a sub-flap configured to guide the direction of air between the main flap and the sub-flap in the preset direction, wherein a length of a main flap in a direction where air flows is longer than that of the sub-flap in the direction where air flows.

An air conditioner includes: a main body having an air outlet; a fan provided in the main body; a heat exchanger provided in the main body; and a first member rotatably supported on the main body and opening and closing the air outlet, wherein the first member includes a first casing having a first surface facing an inner side of the main body while operation is stopped and a second casing attached to the first casing; on the first casing, a recess is formed on the first surface and a protrusion protruding toward the second casing is formed, and the recess is positioned on an opposite side to the protrusion.

The present disclosure relates to a heat dissipation hole structure of a flip-type electronic device. The heat dissipation hole structure includes a first connecting rod, a second connecting rod, and a blade group. The flip-type electronic device includes a base, an upper cover, and a pivot. Two ends of the first connecting rod are respectively pivoted to the pivot and the second connecting rod. The second connecting rod is further pivoted to the blade group. The blade group is disposed in an opening of the base and includes two blades. The two blades are both pivoted to an inner surface of the opening, and one end of each of the two blades is slidably connected to each other. In this way, when the upper cover is opened, the pivot drives the blade group through the first connecting rod and the second connecting rod, so that the two blades rotate.

A damper assembly is configured for placement within a duct of an existing ductwork system, the duct supplies conditioned air through a register boot to a register vent within a room. The damper assembly includes a damper blade that is movable between a closed position and an open position. A damper motor is operably coupled to the damper blade and is configured to move the damper blade between the closed end position and the open end position. A microphone provides an output signal that is representative of sounds sensed by the microphone. A control module is operably coupled to the damper motor and the microphone and is configured to control operation of the damper motor based at least in part on the output signal provided by the microphone.

A damper system is configured for installation in ductwork including a duct supplying conditioned air through a register boot to a register vent. A damper is movable between a closed position and an open position. A control module includes a control module housing, a controller, a power supply and a transceiver. The controller monitors a remaining energy level of the power supply and transmits a first low battery message via the transceiver when the remaining energy level drops to a first energy threshold. The controller instructs the damper assembly to move to a predetermined position and to transmit a second low battery message via the transceiver when the remaining energy level drops to a second energy threshold.

A retrofit damper system is configured for installation in existing ductwork including a duct supplying conditioned air through a register boot to a register vent. The retrofit damper system includes a damper assembly including a damper blade and a damper motor configured to drive the damper blade between a closed end position and an open end position. A control module includes a control module housing and a controller within the control module housing that is configured to regulate operation of the damper motor. The controller outputs a drive signal that causes the electric damper motor to drive the damper blade to the desired position and creates a plurality of interruptions in the drive signal while driving the damper blade. A sense circuit senses back EMF signal, and the controller estimates a blade position based at least in part on the back EMF signals.

A grille assembly having a housing including a corridor between a first end and a second end of the housing. The housing may be fluidly couple with a duct. The grille assembly also includes a core disposed within the corridor and having a plurality of blades that may guide fluid flow through the housing and a first portion of the plurality of blades slanted in a first direction at a first non-perpendicular angle relative to a corridor axis. The first portion of the plurality of blades are spaced relative to one another to form a first plurality of channels that partially pass through the housing. The grille assembly also includes a second portion of the plurality of blades slanted in a second direction that is substantially opposite the first direction at a second non-perpendicular angle relative to the corridor axis. The second portion of the plurality of blades are spaced relative to one another to form a second plurality of channels that partially pass through the housing and the first and second plurality of channels are arranged such that a line of sight from the first end to the second end of the housing is obstructed.

The present disclosure relates to a heat dissipation hole structure of a flip-type electronic device. The heat dissipation hole structure includes a first connecting rod, a second connecting rod, and a blade group. The flip-type electronic device includes a base, an upper cover, and a pivot. Two ends of the first connecting rod are respectively pivoted to the pivot and the second connecting rod. The second connecting rod is further pivoted to the blade group. The blade group is disposed in an opening of the base and includes two blades. The two blades are both pivoted to an inner surface of the opening, and one end of each of the two blades is slidably connected to each other. In this way, when the upper cover is opened, the pivot drives the blade group through the first connecting rod and the second connecting rod, so that the two blades rotate.

This air management system (2) comprises at least one heat exchanger (4, 6), at least one fan (8, 10), and a supporting structure (16) carrying said at least one exchanger (4, 6) and fan (8, 10). The air management system (2) further comprises a check valve (18) superimposed to the fan (8, 10), the check valve (18) being formed by blades (180) which are movable between a closed position, in which the fan (8, 10) is covered, and an open position, in which the fan (8, 10) is uncovered.