A system for controlling airflow from a galley compartment to a plenum chamber comprising: an actuating assembly comprising: a cylinder; a heat-expanding material disposed within the cylinder; a piston disposed within the cylinder, wherein the heat-expanding material is configured to actuate the piston when the heat-expanding material is heated; a piston seal; and a return spring seated at one end at the piston and its opposite end at a retaining surface proximate to an open face of the cylinder, wherein a compressive force of the spring upon the piston at least partially counteracts the force of the heat-expanding material on the piston; and a valve assembly mechanically coupled to the piston of the actuating assembly and configured to be disposed upon at least one of a surface of the galley compartment or a face of the plenum chamber, wherein an adjustment of the piston by the actuating assembly is configured to adjust airflow within an opening of at least one of the galley compartment or the plenum chamber, wherein the valve assembly further comprises a poppet valve, the poppet valve further comprising: a poppet body element coupled to an open side of the cylinder, wherein the poppet body element is configured to be coupled to at least one of the surface of the galley compartment or the face of the plenum chamber; a poppet stem coupled to the piston and inserted within a channel formed in the poppet body element, wherein a movement of the piston causes a movement of the poppet stem; and a poppet head coupled to the poppet stem, wherein a movement of the poppet stem moves the poppet head, which is configured to adjust the airflow within the opening of at least one of the surface of the galley compartment or the face of the plenum chamber. an actuating assembly comprising: a cylinder; a heat-expanding material disposed within the cylinder; a piston disposed within the cylinder, wherein the heat-expanding material is configured to actuate the piston when the heat-expanding material is heated; a piston seal; and a return spring seated at one end at the piston and its opposite end at a retaining surface proximate to an open face of the cylinder, wherein a compressive force of the spring upon the piston at least partially counteracts the force of the heat-expanding material on the piston; and a cylinder; a heat-expanding material disposed within the cylinder; a piston disposed within the cylinder, wherein the heat-expanding material is configured to actuate the piston when the heat-expanding material is heated; a piston seal; and a return spring seated at one end at the piston and its opposite end at a retaining surface proximate to an open face of the cylinder, wherein a compressive force of the spring upon the piston at least partially counteracts the force of the heat-expanding material on the piston; and a valve assembly mechanically coupled to the piston of the actuating assembly and configured to be disposed upon at least one of a surface of the galley compartment or a face of the plenum chamber, wherein an adjustment of the piston by the actuating assembly is configured to adjust airflow within an opening of at least one of the galley compartment or the plenum chamber, wherein the valve assembly further comprises a poppet valve, the poppet valve further comprising: a poppet body element coupled to an open side of the cylinder, wherein the poppet body element is configured to be coupled to at least one of the surface of the galley compartment or the face of the plenum chamber; a poppet stem coupled to the piston and inserted within a channel formed in the poppet body element, wherein a movement of the piston causes a movement of the poppet stem; and a poppet body element coupled to an open side of the cylinder, wherein the poppet body element is configured to be coupled to at least one of the surface of the galley compartment or the face of the plenum chamber; a poppet stem coupled to the piston and inserted within a channel formed in the poppet body element, wherein a movement of the piston causes a movement of the poppet stem; and a poppet head coupled to the poppet stem, wherein a movement of the poppet stem moves the poppet head, which is configured to adjust the airflow within the opening of at least one of the surface of the galley compartment or the face of the plenum chamber.