Mech-Elec boxes type KS are air volume control terminal units for use in single duct installations.
KS boxes consist of a cabinet constructed of galvanised steel-sheet with interior thermal-acoustical insulation of fibreglass, fire resistance M1 not inflammable. They dispose of two connections, one circular or oval at the inlet and another rectangular at the discharge side.
Also available is an additional plenum at the discharge side with various connections: circular, oval or rectangular, up to a maximum of five.
The volume control damper, with its elliptical shape and sealing gasket in its entire periphery, and installed in the circular inlet, is the most adequate to obtain maximum linearity in damper actuation and a reduced sound level.
In the inlet duct a cross-shaped probe is installed which measures the differential pressure which varies with the air volume entering the unit.
The KS unit is used to provide a variable air volume to the room to be conditioned, as a function of the variations of its heat loads.
If it is desired to control the exhaust air from a room as a function of its supply air so as to obtain an over or underpressure with respect to adjacent rooms, the KSR unit should be installed.
The only difference between KSR and KS units is that in the first the air enters the unit from the opposite side, which obliges the position of the differential pressure sensor to be modified.