Abstract: A blower assembly for a pneumatic tube system sequences start of two pneumatic sources, such as blowers, to pneumatically position passive closure devices, such as spools, that shift the blower assembly between pressure and vacuum modes. Thereafter, both blowers are cooperatively operated. Use of two blowers whose combined output achieves the desired pneumatic performance avoids the increased cost of having one or more blowers that only operate only for one mode of either pressure or vacuum. The passive closure devices reliably and rapidly position to enhance performance, especially as compared to electrically actuated closure devices.

Abstract: A blower assembly for a pneumatic tube system sequences start of two pneumatic sources, such as blowers, to pneumatically position passive closure devices, such as spools, that shift the blower assembly between pressure and vacuum modes. Thereafter, both blowers are cooperatively operated. Use of two blowers whose combined output achieves the desired pneumatic performance avoids the increased cost of having one or more blowers that only operate only for one mode of either pressure or vacuum. The passive closure devices reliably and rapidly position to enhance performance, especially as compared to electrically actuated closure devices.