QATT – 4 Channel Programmable Step Attenuator is a four channel step attenuator for the frequency range 100 kHz. 4000 MHz. The attenuation can be adjusted independently for each channel in a wide dynamic range. The device offers multiple control modes for integration into existing. Aerovac ® sound attenuator are manufactured in many varieties, module sizes and materials, including no-fill models and models that eliminated acoustical fill entrainment into the air stream. Select Your Sound Attenuator! P. KBE is a leading manufacturer of air movement & fire smoke management products, dedicated to providing the best service for the HVAC market. We work 6 days a week, every day excluding major holidays. Contact us if you have an emergency, with. A07 DUCT VENTILATION AIR CONDITIONING Co.