This air blower is widely used by compost tea brewers and fish traders. Performance with Reliability, Cast aluminum housing with a high Phosphorylation finish. Fully retained impeller prevents vane fracture and pump failure. Special annual chamber contains smooth airflow, without producing much noise. Aluminum housing provides excellent heat, dispersion, and prevents over-thermal. Filter lid for inlet is provided to prevent the impeller clogged by the dust and solids. Silencer for outlet is provided. Oil-free output allows it to be applied in aquaculture, fish farming, pool bubble, and healthcare. It also can be run as a vacuum pump.