Abstract: The present invention is a system of symmetric guides (25A, 25B) and baffles (26, 28) for directing and diffusing the external air drawn from a fan blower (12) before distributing the flow evenly to the outlet of a fan filter unit (32). This arrangement not only reduces the turbulence and minimizes pressure loss within a fan filter unit (32) but also maintains the even distribution of air when discharged through the same system. Furthermore, the present invention is implemented in dimensions substantially similar to that of the fan blower (12) in terms of heights. As such, the present invention minimizes noise of a fan filter unit (32) even in low clean room ceiling height. Finally, the present invention's guides (25A, 25B) and baffles (26, 28) are symmetrical surrounding the fan blower (12), which allows either the clockwise fan or the anti-clockwise fan to be used for the same fan filter unit (32) for user's convenience.

Abstract: A fan unit including a fan blower configured to emit air in a plurality of directions in an airflow plane. The fan unit includes first and second guide surfaces disposed on a first side of the fan blower in the airflow plane to define together with a wall part, a first airflow path leading to a first airflow channel. Third and fourth guide surfaces are disposed on a second, opposite, side of the fan blower in the airflow plane, to define with a wall means a second airflow path leading to a second airflow channel. The guide surfaces may be mounted on separate guide means which are identical to one another.

Abstract: A fan unit is provided comprising: a fan blower (12) configured to emit air in a plurality of directions in an airflow plane; first and second guide surfaces (27A,27B) disposed on a first side of the fan blower in the airflow plane to define together with a wall part(25A), a first airflow path leading to a first airflow channel, and third and fourth guide surfaces(27C) and (27D) disposed on a second, opposite, side of the fan blower(12)in the airflow plane, to define with a wall means (25B) a second airflow path leading to a second airflow channel, the guide surfaces(27A,27B,27C,27D) being mounted on separate guide means (24A,24B,24C,24D) which are identical to one another.