The Krueger 51240 series modular core diffusers are one of Krueger’s most quiet and versatile diffusers, combining excellent performance with on-the-job flexibility. The 51240 series diffusers exhibit typical isothermal throws of 20’ to 30’ for 4-way air distribution and 40’ to 60’ for 1-way air distribution. The modular cores in the neck maintain a tight horizontal air pattern at the ceiling from maximum to minimum CFM, making this series an excellent selection for variable air volume applications. The modular cores are factory set for a four-way air pattern, but may be field adjusted for 1-, 2- or 3-way air patterns. The modular capability makes the 51240 ideal for installations with changing air pattern requirements such as tenant lease spaces.