Improper smart board size selection will lead to poor viewing experience, wasted budget, or insufficient display range. As a professional Guangzhou interactive display factory founded in 2021, ELON summarizes standardized size selection suggestions based on thousands of global school and office projects, helping buyers make accurate purchasing decisions. For small tutoring rooms and mini meeting rooms (10–15 people), 55-inch and 65-inch interactive flat panels are the most suitable. The compact size does not occupy space and fully meets daily annotation, screen casting and discussion needs. For standard K12 classrooms and medium-sized company meeting rooms (20–35 people), 75-inch smart boards are the mainstream factory-recommended size. The viewing distance perfectly matches conventional room layouts, ensuring both front and back audiences can view content clearly without eye fatigue. For university lecture halls, large training rooms and enterprise conference halls with more than 40 people, 86-inch and 98-inch ultra-large interactive panels are ideal choices. ELON factory’s large-size panels adopt enhanced uniform backlight technology and ultra-wide viewing angle, eliminating edge dark areas and reflection problems. All sizes support wall mounting and mobile stand installation. As a 2021 new factory, we keep updating size matching cases for different regional project standards, providing free one-on-one size planning service for bulk order clients.