Technologies

Patented Constant Air velocity-technology

In addition to the rectifier technology, the Biddle commercial air curtains also feature the innovative Constant Air velocity-technology (CA). The CA-principle consists of an ingenious valve system, which can expand the air discharge opening. Even when the air curtain is set at a higher fan speed, the air velocity will remain constant. As the valve opens up further, the discharge width increases allowing the wider air stream to produce more air volume at the same constant air velocity. The benefits of this technology include:?The wider air stream allows the air curtain to better reach the floor, so that the riskof draught is reduced. ?The constant low air velocity determines the effect of the rectifier technologyresulting in maximum performance and exceptional comfort.?Even in less favourable weather conditions, when the air curtain is set higher byone speed, the comfort conditions should remain constant. As the air discharge design grill expands, the air velocity remains equally low and is, therefore, barely perceptible.
Low fan speed, low air velocity, valve half open.Highest fan speed, valve open, air velocity remains constantly low.

Climates throughout the year

An air curtain is effective throughout the year. In winter, it prevents loss of energy and cold air entering the building. In summer, a continuous recirculation of indoor air prevents the influences from hot outside air on the inner climate. An air curtain with a turbulent air flow results in an undesired mix of outside and inside air. A lot of cooling capacity is needed to create a comfortable climate in the building. The rectifier architectural grille of a Biddle air curtain stabilizes the air turbulences created in the contemporary fans, leading to a proper separation of the inside and outside air. Almost no cooled air disappears through the open professional doors, while a better air distribution will improve the efficiency of the installed home air conditioning equipment. So, also in summer the air curtain saves energy and maintains a stable inner climate. Besides that, it keeps out moisture and insects. 5