Improvements in color management for polypropylene fiber production in terms of permitting similar if not identical processing conditions for both colored and uncolored fiber production are provided. In one aspect the invention provides a grid synchronizer comprising an inverter controller to control an AC output of the inverter, the controller including a receiver to receive grid data from a grid sensor location remote from said inverter. Thus a subset of the array is defined as a portion of the image having first and second dimensions. A heat shield encloses the manifold. The first limb has legs perpendicularly extending therefrom for inserting into through holes defined in the main board.