Abstract: Examples of the present disclosure are related to systems and methods for replaceable multiple filter units. More specifically, embodiments describe replaceable filter units that are configured to simultaneously filter fresh and return air.

Abstract: Examples of the present disclosure are related to systems and methods for replaceable multiple filter units. More specifically, embodiments describe replaceable filter units that are configured to simultaneously filter fresh and return air.

Abstract: A method and system of feeding line on a line trimmer. At least some of the illustrative embodiments are line trimmers comprising a motor, a cutting head coupled to the motor (the cutting head having a line inlet along an axis of rotation of the cutting head, and a line outlet in a direction substantially perpendicular to the line inlet, wherein trimmer line extends through the line inlet and then out the line outlet), an elongated shaft that supports the cutting head on a distal end, and a line feed system coupled to the elongated shaft. The line feed system has a first configuration that prevents feeding of the trimmer line toward the line inlet, and a second configuration that allows substantially unimpeded movement of the trimmer line toward the line inlet, the movement caused by centrifugal force on the trimmer line extending from the line outlet of the cutting head.