DWL

DWL | Dynamic Weather Louver

The DWL Dynamic Weather Louver is purpose-built to complement the SHX-UN universal pressure relief vents. Designed for use in environments where wind and weather protection are essential, this extreme weather louver provides outstanding environmental shielding without limiting the Free Vent Area (FVA) of the underlying vent. In fact, the DWL delivers approximately twice the FVA of traditional fixed-vane louvers commonly used in the HVAC industry. This means fewer louvers are needed to achieve the required performance, offering clear advantages in terms of installation and cost efficiency.

Superior protection without performance loss

One of the most significant advantages of the DWL is its ability to maintain airflow efficiency while providing a high level of environmental protection. The louver blades are engineered from lightweight, powder-coated galvanized steel. The blades are thin enough to maximize airflow, yet strong enough to withstand extreme weather conditions. During storm events, the blades can achieve up to 99% closure, effectively sealing off the vent from wind-driven rain and airborne debris. Despite this near-complete closure, airflow resumes unimpeded as the blades reopen in response to changes in internal pressure.

The DWL also delivers an impressive 98% wind seal, which helps to reduce unwanted drafts and minimize heat loss from the building. This makes it particularly well suited for temperature-controlled environments or facilities where energy efficiency is a priority. The dynamic blade system not only improves thermal performance, but also contributes to better acoustic insulation, reducing the transmission of external noise into the protected space.

Tested under real-world conditions

Like all AmVentco products, the DWL has been extensively tested in our in-house blast simulator. When paired with the SHX-UN vent, the DWL was shown to increase back pressure by only 10% during simulated gas discharge events, including those representing gas suppression systems and GIS arc faults.

As AmVentco vents are engineered to operate well below peak pressure limits as defined by the Vent Design Coefficient (vDc), this minor pressure increase does not compromise performance or safety. The system remains among the most efficient and reliable pressure relief solutions available on the market.

Built to last

The DWL is designed for long-term durability in demanding conditions. Its powder-coated steel construction resists corrosion, while integrated drainage channels direct rainwater away from the building envelope. This ensures continued high performance with minimal maintenance, even in severe weather environments.

From outstanding airflow and sealing performance to rigorous testing and proven reliability, the DWL Dynamic Weather Louver sets a new standard for exterior vent protection, addressing complex challenges. Trusted by engineers, product designers and safety professionals around the world, it delivers the quality and assurance required for critical applications.