Economical, Non-Drainable louvers should be used in applications where ventilation is important and water penetration is unlikely to occur.
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.
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.
Non-Drainable Louvre Models
|Louvre Model||Config.||Louvre Depth (mm)||Blade Spacing (mm)||Rain Defence||Free Area (4'x4')||Free Area (8'x8')||PD @900 FPM|
|A4080 / A4085||Mullion/Cont. Line||100||100||2||54.0%||59.9%||0.15|
|A6080 / A6085||Mullion/Cont. Line||150||150||2||51.5%||58.7%||0.13|