Openness is the share of a blind's weave left open to light and air. A 1% fabric blocks almost everything and gives near-total privacy. A 40% fabric is mostly about wind protection with a wide view kept. Pick wrong and you end up with a patio that feels like a cave, or a blind that gives shade but no seclusion. This guide walks through each level with the actual numbers, so you can match the weave to your space instead of guessing.
Compare all fabric options on our outdoor blinds
What openness actually measures
Outdoor blind mesh is woven from polyester or fiberglass strands coated in PVC. Openness, usually written as a percentage, tells you how much of the fabric surface is open weave versus coated strand. Two consequences follow directly from that number:
- Light and heat: lower openness blocks more sun, so the space behind the blind stays cooler and darker.
- View and air: higher openness keeps more of your view and lets a breeze pass through the panel.
One thing openness does not change is wind stability. That comes from the track system holding the fabric, not the weave itself.
The fabric series, with real numbers
Different mills sell the same openness levels under different series codes. The table below is the range we stock, which covers every common outdoor use. Compositions matter more than buyers expect: fiberglass weaves (GF and G5500 series) stretch less than polyester, so the panel hangs flatter over years of sun.
| Series | Openness | Blackout | Composition | Best for |
|---|---|---|---|---|
| A4000 | 1% | 99% | 30% polyester, 70% PVC | Maximum privacy and shade, near-blackout |
| P4000 | 3% | 97% | 30% polyester, 70% PVC | Strong shade, faint outline of the view |
| CF4000 | 5% | 95% | 30% polyester, 70% PVC | The all-round middle choice |
| QC4000 | 10% | 90% | 30% polyester, 70% PVC | Brighter spaces, still cuts glare |
| 1100 | 40% | 60% | 28% polyester, 72% PVC | Wind protection and light filtering, view kept |
| GF4000BN | 5% | 95% | 42% fiberglass, 58% PVC | Afternoon sun with less sag over time |
| G5500BN | 3% | 97% | 42% fiberglass, 58% PVC | Privacy with a fiberglass weave |
There is also a clear PVC panel option, which holds out wind and rain while keeping the view completely open. It behaves differently from mesh: fully waterproof, no airflow, and best for exposed corners where you still want to see the garden.
The same patio, six weaves: from 1% near-blackout on the left to the clear panel on the right.
Matching openness to your space
West or south facing patio, hot afternoons. Aim for 1% to 5%. If the sun sits low and comes in under the blind edge, lower openness does more for comfort than a bigger drop size would.
Patio facing a neighbor or the street. Privacy during the day comes from the inside being darker than the outside. A 1% or 3% weave gives you that; from 5% upward, silhouettes start to show once your lights are on at night.
Pergola where you want airflow. Go 10% or 40%. A pergola with a roof already gives shade from the top; the side blinds are usually there for wind, low sun and privacy at the sides. Mesh with higher openness keeps the breeze, which is half the reason people sit under pergolas.
Coastal or fully exposed site. Fiberglass weaves are worth it here. Salt air and constant sun stress polyester faster, and the lower stretch of fiberglass keeps the panel from bagging between the rails.
Every series carries its openness, blackout and composition figures on the fabric card. This is the A4000, the 1% near-blackout weave.
Dining area used in the evening. Remember that openness works both directions after dark. Whatever level you choose, the space lit from inside becomes more visible at night than during the day. If you host often, weigh privacy more heavily than you think you need.
A quick way to decide
If you can only remember one rule from this guide, use this: choose openness for how much sun you want to block, then handle privacy by choosing where the blind hangs. A 5% weave at seated eye level feels more private than a 1% weave hung high. Openness sets the mood of the space; mounting sets the coverage.
Frequently Asked Questions
Will a 5% openness fabric keep my view? Yes, with the usual tradeoff. You will see the outline of the garden clearly and colors will read slightly softened. The view reads best with 10% and 40% weaves, and of course with the clear panel.
Does higher openness mean less wind resistance? No, provided the blind uses a track system that locks the fabric edges. A 40% mesh actually takes wind load better in one respect, because some pressure passes through the weave instead of loading the panel. What fails in wind is the retention system, not the openness.
Which openness is most popular? The 5% level, in most markets, is the volume choice for patios. It lands in the middle of shade, view and privacy, which suits spaces people use for everything from morning coffee to evening drinks.