Abstract: An auxiliary air fume hood provided with an improved airflow system for controlling the passage of air through an auxiliary air housing and orienting the flow of air in front of the face of the hood. The hood is designed to capture the auxiliary air through the face of the hood when the temperature of said air is as much as 20.degree. F. higher than the room air temperature.

Abstract: A fume hood having top and rear baffle systems fixedly secured within a housing of the fume hood to provide a passage for lighter than air fumes along the top baffle and a passage for heavier than air fumes along the rear baffle. A movable damper selectively connects these passages with an exhaust of the fume hood, and this movable damper is remotely controlled from outside the fume hood adjacent the work area of the fume hood. An operator can control fume flow within the hood while the work area is closed by a sash.

Abstract: A filter assembly for filtering air comprises a filter housing and a filter which is removably positioned within the housing. The filter housing includes spaced-apart first and second housing portions which are connected by connecting members on opposite sides of the housing, and the filter is positioned between the two housing portions. One end of each of the connecting members is secured to the first housing portion, and the other end of each connecting member is connected to the second housing portion in a manner which permits the second housing portion to be moved along the connecting members toward and away from the first housing. When the second housing portion is moved away from the first housing portion, the filter can be removed.

Abstract: A laboratory fume hood that has a lower baffle, intermediate baffle, and upper baffle spaced from each other and from a floor of the fume hood for directing fumes upwardly to an exhaust opening. The baffle system provides an inverted funnel configuration with the hood wall for improved gas sweeping action adjacent the hood floor.

Abstract: A fume hood with an air actuated valve system for directing a mixture of room and external air in front of a horizontal sash when such sash is open, and behind this sash when it is closed.