Hartzell Aerospace is a group of 3 companies which provide Noise Control for APUs & ECS; Electric Heaters for Freeze and Ice ... Protection, electric ECS heaters and Low Pressure Composites Ducting and Hoses/Connectors. We have design, test, manufacture and qualification capabilities. We supply the major aerospace OEMs and Tier 1 throughout the world. Hartzell Aerospace divisions are Electrofilm Manufacturing Co., Industrial Tube Co. and AcousticFab. read more