“Harmony in design.”
Developed in collaboration with architect Álvaro Siza Vieira, the EFAPEL SIZA series stands out for its iconic design, where circular forms contrast with square centres, creating a distinctive and harmonious geometric composition. Compatible with the Q45 mechanical system, this collection captures the essence of contemporary architecture, offering aesthetic and functional solutions for modern and avant-garde spaces.



SIZA Surface Box — Versatility for urban rehabilitation
Inspired by the series created by Álvaro Siza Vieira, the SIZA Surface Box was developed to meet the growing demands of urban rehabilitation. Its surface-mounted design allows for the modernisation of spaces without compromising the architectural integrity of buildings, preserving interior identity. With a circular design, it can be installed as a single or double unit, in horizontal or vertical orientation, ensuring versatility and aesthetic consistency.
