Fixed vs. Adjustable Louver Privacy Screens: How to Choose Blade Specifications

Short answer: Privacy with a louver screen is determined by geometry, not product quality. A screen blocks sightlines only when no straight line exists from a neighbor's eye to your space between the blades. Therefore, blade width, spacing, and pitch are engineered to block specific viewing angles—not selected from a catalog. Fixed blades achieve this at the lowest cost with no moving parts; adjustable blades allow occupants to balance privacy against light and airflow throughout the day. First, determine which sightline must be blocked, then let that define the blade specifications—not the other way around.

Privacy screen geometry

A row of angled blades with gaps between them optically forms a series of parallel slots. Visibility from the other side depends on a single factor: whether a straight line can pass through the slot geometry to your side. This line is determined by:

• Blade width— the horizontal depth of each blade,
• Spacing and overlap— the distance between blades and the amount of overlap with the next one
• Pitch angle— the blade's rotation, which alters the effective slot opening.

Narrower spacing or greater overlap blocks sightlines from wider viewing angles, but it also reduces light and airflow while adding weight and wind load. There is no "privacy setting" that comes for free: every increase in screening means a decrease in openness. This is why the common mistake is buying "a privacy screen" as a fixed product rather than as a solution to a measured problem. The key questions are: where is the observer standing, at what height is their eye level, and what part of our space must they not see?

Fixed or adjustable?

The key question is whether the privacy requirement is constant. For fixed neighbors, a screen with one function and fixed blades offers a more cost-effective solution with no parts to wear out. In contrast, screens around pools or outdoor entertainment areas are typically left open and only closed when in use—this usage pattern requires adjustable blades. Also consider local wind conditions: large adjustable blade panels act as bigger wind sails than their fixed counterparts, so the blade lock mechanism must securely hold the entire panel in place.

Blade orientation is just as important as blade size.

Horizontal blades offer the classic louvre appearance and effectively block sightlines from standing or seated positions at typical distances. Vertical blades alter the geometry by blocking sightlines across the panel's width rather than its height, and they shed rain differently. Australian screen manufacturers note that vertical orientation is better suited for coastal areas with wind-driven rain, while horizontal works best for most residential sightline concerns.

If the screen must also shed rain rather than channel it into the space, blade shape matters: elliptical blades shed water more cleanly than flat blades. This is why most commercial louver profiles are elliptical rather than rectangular.

Real-world blade sizes

There's no universal standard, but the market has converged on a narrow range of blade widths. In Australia, elliptical blades are commonly available in standard sizes of 85mm and 160mm, with 60mm and 200mm offered for specific applications. The key concept to understand is this: wider blades create a deeper profile, allowing manufacturers to achieve the same level of privacy with wider spacing (improving airflow) or significantly enhanced privacy when spaced more closely.

Blade width also determines panel geometry. Panel widths are available in fixed increments based on blade overlap and spacing (for example, one manufacturer's 85mm-blade panels come in widths such as 881, 961, and 1041mm).). If your opening dimension falls between these standard steps, the difference is accommodated by the frame—not by adjusting the blade spacing. Therefore, a supplier who claims they can "adjust the spacing to fit your exact width" is likely compromising privacy.

The spec sequence that produces the correct result

1. Identify the observer's location.A neighbor's window, a street, or a public walkway? Viewing from eye level (~1.6–{1.7m}) at a first-floor window presents different considerations than observing from ground level along a fence line.
2. Define sightlines to block.Draw lines from the observer's likely position to the area you need to screen. The angle of these lines relative to the screen plane defines your required blade geometry.
3. Select orientation— horizontal or vertical — relative to sightlines and rain exposure.
4. Select blade width and spacingAchieve the required viewing angle while maintaining the openness you need. If adjustments are needed throughout the day, select an adjustable option.
5. Check wind and maintenance conditions— Larger blades capture more wind; adjustable systems require maintenance of components in coastal salt air.
6. Confirm panel manufacturabilityat your width within the manufacturer's fixed geometry steps.

Questions to Ask Any Supplier

1. What blade spacing and pitch ensure privacy?Marketing visuals often obscure the actual geometry; request the precise viewing angle obstruction in degrees.
2. What are your standard blade widths, and how do panel widths increment?— This indicates whether your opening fits the geometry or will be adjusted.
3. Fixed or adjustable at this size, and what secures the adjustable blades in position?In wind, the blade lock is the entire game.
4. Is the blade elliptical or flat, and how does the screen handle wind-driven rain?— Keeps the space behind dry in bad weather.
5. "What coating and warranty options are available for coastal exposure?"Salt air first corrodes blade edges and adjustable hardware.
6. What is the wind load for my panel dimensions?— The screen itself acts as a sail; the structure it attaches to must support it.

Frequently asked questions