The object of the research is the influence of frame size on fire resistance of gel-filled structures. Method. The research method consisted of determining the time it takes for gel-filled glass unit samples to reach the ultimate limit state (EIW) during a standard fire test in a furnace under standard temperature conditions. Results. The scale factor has a significant impact on the fire resistance of the structure. Square shapes of gel-filled glass units have better fire resistance results compared to rectangular ones. For the tested rectangular glasses, the actual fire resistance limit is EI/EW30 and EI/EW45, while for small-sized glasses and square samples it is EI/EW60. Poor adhesion of the gel to the glass reduces its fire resistance. The use of FT-1 glasses prevents cracks on the unheated surface, which is especially important for large-sized samples. Increasing the gel thickness by 2-4 mm increases the fire resistance limit to 15 minutes. Compliance with technological standards for storage and installation is critically important for achieving the declared fire resistance indicators.