Abstract: A fluid flow apparatus is provided that is configured to receive a threaded fitting in a manner so as to align with an internally threaded hole in the apparatus to avoid cross-threading. The fluid flow apparatus includes a body having an outer surface, and an internally threaded hole in the outer surface. The internally threaded hole may have a number of start threads with an associated thread lead distance. The fluid flow apparatus includes at least two slots in the outer surface, where the slots extend to and intersect the internally threaded hole in the outer surface. The at least two slots have a depth from the outer surface that is more than ½ the thread lead distance but less than 1½ times the thread lead distance, such that for each start thread only a first coil of the start thread has a full threadform cross-section that is exposed by the slots.

Abstract: An air cleaner is provided that includes one or more ionizing panels having at least one ionizing wire in connection with a voltage source. One or more collector cells separate from the one or more ionizing wire panels are releasably received within the air cleaner housing to establish an electrical connection between the collector cell and the voltage source for applying a voltage potential between the collector cell and the ionizing wire. The collector cell may be removed from the air cleaner to permit cleaning of the collector cell separate from the ionizing panels. The air cleaner monitors at least one variable indicative of the operation of the air cleaner. Upon determining that the variable has reached a predetermined level indicative of a significant amount of dust accumulation, a controller activates a light source to illuminate indicia on a display screen which indicates a need for servicing the air cleaner.

Abstract: An air cleaner is provided that comprises one or more ionizing panels having at least one ionizing wire in connection with a voltage source. One or more collector cells separate from the one or more ionizing wire panels are releasably received within the air cleaner housing to establish an electrical connection between the collector cell and the voltage source for applying a voltage potential between the collector cell and the ionizing wire. The collector cell may be removed from the air cleaner to permit cleaning of the collector cell separate from the ionizing panels. The air cleaner monitors at least one variable indicative of the operation of the air cleaner. Upon determining that the variable has reached a predetermined variable indicative of a significant amount of dust accumulation, an activates a light source to illuminate indicia on a display screen which indicates a need for servicing the air cleaner.