A ventless downdraft system may include a housing; a table frame disposed on top of the housing, the table frame including a top surface; a first heating element and a second heating element supported by the table frame; a vent disposed between the first and second heating elements in the table frame and configured for directing smoke generated by the first and second heating elements downwardly into the housing; a vent cover disposed on the vent and outwardly from the top surface of the table frame, where the vent cover includes a first surface extending outwardly from the top surface of the table frame and facing the first heating element and a second surface extending outwardly from the top surface of the table frame and facing the second heating element; and a filter assembly disposed in the housing and configured for filtering the smoke directed into the housing.

A ventless downdraft system may include a housing; a table frame disposed on top of the housing, the table frame including a top surface; a first heating element and a second heating element supported by the table frame; a vent disposed between the first and second heating elements in the table frame and configured for directing smoke generated by the first and second heating elements downwardly into the housing; a vent cover disposed on the vent and outwardly from the top surface of the table frame, where the vent cover includes a first surface extending outwardly from the top surface of the table frame and facing the first heating element and a second surface extending outwardly from the top surface of the table frame and facing the second heating element; and a filter assembly disposed in the housing and configured for filtering the smoke directed into the housing.

A solid fuel combustion device includes: a fuel supply device including a firewood feed pipe or another fuel supplier; a primary combustion chamber coupled to the fuel supply device; a secondary combustion chamber including a wall formed of a fireproof material and having a structure in which a space is formed at a side of the combustion gas outlet of the primary combustion chamber to induce primary combustion gas to be secondarily expanded and combusted; and an air supply system including at least one air supply device in an entire combustion path formed in the primary combustion chamber and the secondary combustion chamber.

A solid fuel combustion device includes: a fuel supply device including a firewood feed pipe or another fuel supplier; a primary combustion chamber coupled to the fuel supply device; a secondary combustion chamber including a wall formed of a fireproof material and having a structure in which a space is formed at a side of the combustion gas outlet of the primary combustion chamber to induce primary combustion gas to be secondarily expanded and combusted; and an air supply system including at least one air supply device in an entire combustion path formed in the primary combustion chamber and the secondary combustion chamber.

A highly efficient indoor heating system and device is described. The device is equipped with an internal chimney, as well as vents that are configured to maximize the draft applied to the flame housed within a stove combustion area. The heater is configured to reach temperatures exceeding 300 degrees Fahrenheit in approximately ten minutes. A gravity fed fuel tube, potentially in communication with a wood pellet hopper, is configured to deliver fuel to the stove of the heater. Heat is distributed throughout the structure of the device, and a convection chamber within the device ensures that heat generated is not quickly lost via exhaust.

A highly efficient indoor heating system and device is described. The device is equipped with an internal chimney, as well as vents that are configured to maximize the draft applied to the flame housed within a stove combustion area. The heater is configured to reach temperatures exceeding 300 degrees Fahrenheit in approximately ten minutes. A gravity fed fuel tube, potentially in communication with a wood pellet hopper, is configured to deliver fuel to the stove of the heater. Heat is distributed throughout the structure of the device, and a convection chamber within the device ensures that heat generated is not quickly lost via exhaust.

A solid fuel combustion device includes: a fuel supply device including a firewood feed pipe or another fuel supplier; a primary combustion chamber coupled to the fuel supply device; a secondary combustion chamber including a wall formed of a fireproof material and having a structure in which a space is formed at a side of the combustion gas outlet of the primary combustion chamber to induce primary combustion gas to be secondarily expanded and combusted; and an air supply system including at least one air supply device in an entire combustion path formed in the primary combustion chamber and the secondary combustion chamber.

A highly efficient indoor heating system and device is described. The device is equipped with an internal chimney, as well as vents that are configured to maximize the draft applied to the flame housed within a stove combustion area. The heater is configured to reach temperatures exceeding 300 degrees Fahrenheit in approximately ten minutes. A gravity fed fuel tube, potentially in communication with a wood pellet hopper, is configured to deliver fuel to the stove of the heater. Heat is distributed throughout the structure of the device, and a convection chamber within the device ensures that heat generated is not quickly lost via exhaust.

A cooking apparatus may have a vat configured to accommodate a heat source, the vat having a top open end. A grate covers the top open end and configured to receive foodstuff thereon to expose the foodstuff to heat from the heat source. A ventilation conduit extends from a bottom and/or a side of vat, the ventilation conduit having a first end in fluid communication with the vat, and having a second end away from the vat. The second end of the ventilation conduit is alternatively an air intake and a smoke exhaust.

Disclosed is a portable smokeless stove, including a combustion cylinder, a separating net and first ventilation holes. The combustion cylinder is provided with an accommodating chamber with upper and lower openings, and the accommodating chamber can accommodate a fire source; the separating net is provided in the accommodating chamber and can carry the fire source; and first ventilation holes are provided at upper and lower ends of the combustion cylinder, each of the first ventilation holes is distributed along a circumferential direction of the combustion cylinder and communicated with the accommodating chamber, and the first ventilation hole at the lower end is underneath the separating net.