204x60mm rectangular ducting is manufactured to meet the ventilation requirements of modern building design, in particular apartments. With the desire to maximise living space and ceiling height, rectangular ducts are the perfect solution for small ceiling void applications and tight spaces. The Verplas rectangular duct systems are designed to maximise airflow and contribute to lower system resistance. 110x54mm offers the ideal solution for traditional fan installations into extensions and refurbishment properties while our high flow 220x90mm ducting offers increased free area to accommodate larger airflow requirements for properties with non-open windows whilst ensuring ceiling installation space is kept to a minimum.