Construction Specialties Storm Resistant Louvres repel up to 100% of wind-driven rain. Available in both horizontal and vertical configurations.
Ideal when you:
- Need 100% resistance to wind-driven rain
- Expect winds as high as 50 mph that drive around 20mm of water per hour
- Must integrate the louvre into the building’s total design or house them behind architectural grilles, detailing or continuous-line louvres
- Can’t use a plenum due to cost or space considerations
- Plan to house sensitive equipment adjacent to the louvre system
- Need a louvre to integrate with a CENTRIA Formawall® Dimension Series® panel system
Louvre pressure drop is one of the key parameters of establishing the louvre requirements for your project as it’s based on the needs of the building and its ventilation system, rather than “free area” which doesn’t really mean anything.
Pressure drop is defined as the pressure differential from one side of a louvre to the opposite side, often expressed in Pascals (Pa). Louvre pressure drop occurs when frictional forces, caused by the resistance to flow, act on air moving through a louvre.
Increased louvre pressure drop can prevent equipment inside the ventilated area drawing sufficient air through the louvre, resulting in overheating, as the equipment has to work harder to draw the air through.
Guidance
Air Density (ρ)
is generally 1.225 kg/m³ (at sea level)
Volumetric Flow (qv)
is supplied by the ventilation engineer and relates to the amount of air required through the system
Core Area (A)
The minimum height times the minimum width of the front opening in a louvre assembly with the louvre blades removed.
Discharge Loss Coefficient (CD)
See chosen louvre model testing information.
Storm Resistant Models
| Louvre Model | Config. | Louvre Depth (mm) | Blade Spacing (mm) | Rain Defence | Free Area (4'x4') | Free Area 8'x8') | PD@900 FPM |
|---|---|---|---|---|---|---|---|
| RS-5300 | Mullion | 125mm | 79mm | 5 | 47.3% | 51.5% | 0.32 |
| RSH-5700 | Mullion | 125mm | 50mm | 6 | 45.8% | 49.0% | 0.13 |
| RS-4300 | Mullion | 100mm | 54mm | 4 | 46.9% | 50.1% | 0.26 |
| RS-7315 | Recessed Mullion | 175mm | 98mm | 5 | 50.6% | 54.6% | 0.23 |
| RS-5605 | Vertical | 125mm | 25mm | 7 | 59.1% | 62.9% | 0.08 |
| RSV-5700 | Vertical | 125mm | 50mm | 7 | 45.8% | 49.0% | 0.13 |
| RS-9615 | Cont. Line | 225mm | 100mm | 7 | 59.1% | 62.9% | 0.28 |
