Abstract: An unpowered cowl with adjustable fan blades and a waste heat recovery system for cooking fumes include a cowl body, lifting mechanisms, and a pressure sensor. The cowl body includes a top cap, a bottom ring, and the fan blades disposed between the top cap and the bottom ring. The pressure sensor is disposed on an inner wall of the top cap. An upper end of each of the fan blades is disposed above the top cap and slightly exceeds an outer edge of the top cap. The lifting mechanisms are annularly disposed on the top cap. The lifting mechanisms include lifting plates, electric pushing rods, and lifting shafts. The electric pushing rods are fixed on the top cap. The lifting shafts are connected to the fan blades. The electric pushing rods and the pressure sensor are electrically connected to a control box.

Abstract: An unpowered cowl with adjustable fan blades and a waste heat recovery system for cooking fumes include a cowl body, lifting mechanisms, and a pressure sensor. The cowl body includes a top cap, a bottom ring, and the fan blades disposed between the top cap and the bottom ring. The pressure sensor is disposed on an inner wall of the top cap. An upper end of each of the fan blades is disposed above the top cap and slightly exceeds an outer edge of the top cap. The lifting mechanisms are annularly disposed on the top cap. The lifting mechanisms include lifting plates, electric pushing rods, and lifting shafts. The electric pushing rods are fixed on the top cap. The lifting shafts are connected to the fan blades. The electric pushing rods and the pressure sensor are electrically connected to a control box.

Abstract: Medical and environmental diagnostic devices are described and claimed. Preferred embodiments feature cup within cup configurations wherein one cup is dedicated, for the most part, to sample collection and another cup is dedicated, for the most part, to assay performance. Communication between the cups is afforded by what is believed to be a unique valve assembly and lid tandem.