The openness factor is the single most important specification when choosing solar shades or anti-glare film. It measures the percentage of the fabric or film that is open weave, determining how much light, glare, and UV passes through. 1% openness: Maximum protection. Blocks nearly all glare, with minimal outward visibility. Best for control rooms, marine bridges, and media rooms. 3% openness: Excellent glare control with some outward visibility during the day. Popular for ATC towers, server rooms, and boardrooms. 5% openness: The most popular choice overall. Good glare reduction with clear outward visibility. Ideal for offices and healthcare. 7% openness: Moderate glare reduction with excellent views. Works well for residential and hospitality. 10-14% openness: Light filtering with maximum view-through. Softens harsh light without significantly darkening the room. At Blinds Concept, we offer free fabric samples at every openness level so you can see the difference before you buy.