[Duct Reducer]: For connecting two ducting sections of different diameters or for connecting a hose to an inline fan or exhaust vent. Compatible with both flexible and rigid sheet metal ducts. [Size]: One side features a 6-inch female spigot designed to fit into 6-inch ducting. Outer Diameter: 151mm, Inner Diameter: 146mm. The other side has a 4-inch male spigot designed to fit into 4-inch ducting. Outer Diameter: 99mm, Inner Diameter: 94mm. Overall thickness: 2.5mm, height: 110mm. [Application]: This duct reducer is suitable for a wide range of applications including air-cooled hoods, garage ventilation, attic exhaust, bathroom and kitchen extractor fans, hydroponics systems, and HVAC ventilation. The rigid plastic construction makes it ideal for both DIY and professional use. [Easy to Install PVC Reducer]: No tools required for installation. Designed for easy connection and secure fit with standard ducting. Ideal for use with tumble dryer vent pipes and hoses, bathroom vents and extractors, air conditioning units, kitchen fans and vents, heat transfer systems, ventilation setups, gas and electric dryers, cooker hood extractors, as well as various industrial, DIY, and trade applications. Note: Before purchasing, measure the inner and outer diameters of your connecting components. The inner diameter of the hose must be larger than the outer diameter of the reducer, and the fan connection must be smaller than the inner diameter of the reducer. Colour: White Material: Plastic Specification: 100-150mm Package Contents: 1 x Duct Adapter Note: Light reflection and differences in display screens may cause slight variations in the color of the item shown in the image compared to the actual product. Measurement may vary by +/- 1-3cm.