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How do you find the right one? Learn to spot subtle differences in louver design in \"Louvers 105\".","\u003Cp>Below are two louvers. Can you tell which one will work on your project? They may look the same, but these two louvers are different models. They share similarities in design: they both have fixed, non-drainable blades and both louvers have a frame depth of four inches. It also doesn’t help that both have a white finish. \u003C\u002Fp>\u003Cp>Two louvers can share many of the same features, but they can perform differently when installed. A subtle difference in design can mean the difference between a louver that works and a louver that won’t meet your requirements. Louvers are deceptively simple. This can make it difficult to design louvers for a project.\u003C\u002Fp>\u003Cfigure class=\"image\">\u003Cimg style=\"aspect-ratio:800\u002F503;\" src=\"https:\u002F\u002Fawv-cdn.nyc3.cdn.digitaloceanspaces.com\u002Fblog\u002F_transforms\u002F_blogPost\u002F13399\u002FAWV-Blog-2026-Louvers-105-Side-by-Side-Louvers.webp?transformId=3379\" width=\"800\" height=\"503\" alt=\"\" \u002F>\u003C\u002Ffigure>\u003Cp>To choose the best louver, you need a closer look at the design.\u003C\u002Fp>\u003Cp>Let’s return to the two louvers above. For reference, the left louver is the LE-27 and the right one is the LE-47. From here on out, we will call them by their model numbers.\u003C\u002Fp>\u003Cp>Notice that the blades on the LE-27 curve back at the edge. The edges make a hook shape. This design provides more space under the blade, which means more free area. The blades on the LE-47 slant straight down from the edge. This slanted blade design can help prevent light rain from passing into the blade. It can also help divert drainage off the blades. These differences aren’t just cosmetic; each louver will perform differently in the field. \u003C\u002Fp>\u003Cfigure class=\"image\">\u003Cimg style=\"aspect-ratio:800\u002F544;\" src=\"https:\u002F\u002Fawv-cdn.nyc3.cdn.digitaloceanspaces.com\u002Fblog\u002F_transforms\u002F_blogPost\u002F13397\u002FAWV-Blog-2026-Louvers-105-LE-27-Stats.webp?transformId=3382\" width=\"800\" height=\"544\" alt=\"\" \u002F>\u003C\u002Ffigure>\u003Cp>Let’s look at the performance data for each louver to see the difference. The LE-27 has a free area percentage of around 56 percent, which means that 56 percent of the louver’s total square footage will be free area. This is an excellent design for air flow. And that design translates to performance. The LE-27 has very little pressure drop, only 0.09 inches of water gauge or 29 pascals of pressure loss at 774 feet per minute (3.96 meters per second). That means you can draw air through this louver with minimal effect. However, it also makes the louver more susceptible to water infiltration.\u003C\u002Fp>\u003Cp>The louver with the edge slants, the LE-47, has a free area percentage of around 51 percent. That makes a difference of only five percent, which seems minor. But it does affect the louver’s performance. The LE-47 has a pressure drop of 0.18 inches of water gauge at 822 feet per minute, or 44.6 pascals at 4.17 meters per second. This may seem like an “apples to oranges” comparison, because each louver provides a different “velocity through free area”. This is the velocity of air moving through the louver’s free area. \u003C\u002Fp>\u003Cfigure class=\"image\">\u003Cimg style=\"aspect-ratio:800\u002F511;\" src=\"https:\u002F\u002Fawv-cdn.nyc3.cdn.digitaloceanspaces.com\u002Fblog\u002F_transforms\u002F_blogPost\u002F13398\u002FAWV-Blog-2026-Louvers-105-LE-47-Stats.webp?transformId=3383\" width=\"800\" height=\"511\" alt=\"\" \u002F>\u003C\u002Ffigure>\u003Cp>For a better understanding, let’s look at the pressure drop data on their submittals. With the pressure drop graph provided, we can compare the two louvers at the same velocity. At 2000 feet per minute, the LE-27 has a pressure drop of around 0.58 inches of water gauge while the LE-47 has a pressure drop of around 0.80 inches of water gauge. This can be the difference between efficient air intake and an unnecessary drop in system performance.\u003C\u002Fp>\u003Cp>However, that doesn’t make the LE-27 a clear winner. It depends on what you need the louver to do. Remember how the LE-47 has those slants along the edge of the blade? Those can help protect the interior of the opening from water infiltration. \u003C\u002Fp>\u003Cp>Let’s look at the water penetration data. AMCA testing measures the point in air velocity when at least 0.01 ounce of water passes through the louver during air intake. This is the louver’s beginning point of water penetration. The LE-47 has a beginning point of 822 feet per minute, which means the louver will protect the opening assuming airflow intake does not exceed 822 feet per minute. The LE-47 isn’t a drainable louver, but it may provide the protection you need for your project. You will have to know the maximum air intake for an opening before you choose a louver.\u003C\u002Fp>\u003Cfigure class=\"image\">\u003Cimg style=\"aspect-ratio:800\u002F656;\" src=\"https:\u002F\u002Fawv-cdn.nyc3.cdn.digitaloceanspaces.com\u002Fblog\u002F_transforms\u002F_blogPost\u002F13401\u002FAWV-Blog-2026-Louvers-105-Water-Penetration.webp?transformId=3381\" width=\"800\" height=\"656\" alt=\"\" \u002F>\u003C\u002Ffigure>\u003Cp>Which louver should you choose? It depends on what you need. The best first step is understanding your project’s needs and requirements. Neither the LE-27 nor the LE-47 will work if you need a louver rated for wind driven rain. Projects in hurricane-prone areas will need louvers that are listed for AMCA 540 and AMCA 550. You won’t have the same louver in every opening in your building, either. \u003C\u002Fp>\u003Cp>Conditions will change from area to area. You may find the LE-27 works well in an opening with an overhang above, because the opening is already protected for the most part. There may even be areas that don’t need any protection. For example, you might add louvers along a wall to help spruce up the appearance of the façade. \u003C\u002Fp>\u003Cp>There are louvers for any application you can think of, but they can all look the same in pictures. That is why you should examine a louver and review its submittal for performance data. These can help you determine whether a louver will work or not for your project. 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