A modular air control device for forming an air curtain comprising:
- a bottom board (2) further comprising a rectangular piece of a corrugated material of parallel rows of plastic tubes and each less than 50 square millimeters (0.078 square inches) cross sectional area and in a panel form, a seal at a one end designated as a sealed end (6), a lower trench (18) cut into a surface of the bottom board near the sealed end of the bottom board and fitting within the dimensions of a kneehole under an office desktop;
- a case of thermal plastic (1) further comprising a flat top and four lateral walls with bottom edges which are sealed with a tape (3) to the bottom board and one lateral wall is positioned at an outboard edge of the lower trench;
- a centrifugal blower (7) centered on a drive axis between two sides of the bottom board, positioned within the case, emitting noise at a low level, having a high speed, having a specification for a required power within a universal serial bus (USB) or a universal serial bus 2 (USB2) power supply specification and including a standard USB cable;
- an air inlet (4) through the top of the said case and over the centrifugal blower;
- a blower inlet (9) coinciding with the air inlet, sealed to the air inlet and fluidically receiving the air flow through the air inlet;
- a blower outlet (8) directing the air flow toward said sealed end (6) and a dam (11) further directing the air flow;
- a first transition piece (14) comprising an upper layer and a lower layer of said corrugated material fluidically connected to the blower outlet and fluidically receiving part of the air flow directed by the dam at a lateral angle from the blower outlet towards a first side;
- a second transition piece (15) comprising the upper layer and the lower layer of the corrugated material fluidically connected to the blower outlet and fluidically receiving part of the air flow directed by the dam at a lateral angle from the blower outlet towards a second side;
- a baffle (16) comprising the upper layer and the lower layer of the corrugated material fluidically connected to said first transition piece and the said second transition piece and fluidically receiving the air flow laterally from the first transition piece and the air flow laterally from the second transition piece, and the air flow impacting an entrance plane of the baffle and inducing turbulence within the baffle;
- an upper trench (13) in the upper layer of the baffle and receiving the air flow from the baffle and balancing the air flow, separately, in two halves of the upper trench;
- a mixing mask (17) comprising a strip of plastic in said lower trench (18) in said bottom board, shaped and positioned at assembly time, mixing the air, tuning the contribution of each of the air flow paths, connected fluidically to the baffle and receiving the air flow in a 90 degree turn from the upper trench and the baffle;
- an air discharge (5) fluidically receiving the air flow from the lower trench in the bottom board, in a reversed flow path from said sealed end (6) of the bottom board and a length of the bottom board to exit out of the bottom board, in said air curtain of between 3 and 7 mm (0.12 and 0.28 in) in thickness, in a laminar flow and in a nearly equal velocity across its width.