C/S offers architects two ways to specify the correct louver every time. Our selection charts, categorized by depth, free area, static pressure, rain defense and hurricane proof provide you with the general performance of every C/S Louver (4' x 4' size).
The Airflow Design Tool calculates the exact free area and pressure drop you'll get from the actual size of the louvers to be used. If static pressure drop and free area are specified by the engineer we recommend starting with static pressure drop as the primary selection criteria.
The louver free area is the minimum area through which air can pass and it varies with louver size. Free area is determined by calculating the percentage of the total opening that is unobstructed by blades and frame. Louvers in this search are organized from the highest to lowest free area independent of model type.
Louver rain defense is a measurement of how successful a louver is at keeping water from entering through a louver. Rain defense effectiveness is measured by several test methods. AMCA Standard 500 water penetration tests use still air conditions.
Pressure drop is the measurement of the pressure differential from one side of a louver to the opposite side. Pressure drop is used to measure the resistance to airflow across an open louver. Pressure drop is important in the sizing and performance of louvers.
It is usually expressed in inches of water at specified velocity. Louvers in this search are organized from the highest to lowest static pressure independent of model type pressures. Louvers in this search are organized from the most effective rain defense louver to the least.
Dade County approved louvers have been designed to pass rigorous structural, wind pressure, wind driven rain penetration and missile impact conditions required by the Dade County Building Codes of Southern Florida. Dade County Louvers are designed to battle rigorous hurricane wind and rain conditions.
Depth of a louver is the measurement of the depth of a louver frame. Depths of louvers vary due to one or a combination of the following criteria: air performance, water protection, sound transmission, installation/site requirements and aesthetics. Louvers in this search are organized from the widest to the narrowest depth independent of model type.
A louver's size has impact on it's free area. A louver that provides 50% free area at 4' x 4' (the industry test standard) may only provide 39% at 2' x 2'. This difference could create problems for the HVAC system.
In addition, complex louver blades, such as Storm Resistant models, create increased airflow turbulence. The mechanical equipment may not be able to overcome this drag (static pressure drop) created by these blades. To avoid these problems, specify louvers using both static pressure drop and free area criteria.