A manufacturing system for making a fibrous product, the system comprising: a plurality of fiberizing units associated with a conveyor movable in a machine direction, each fiberizing unit comprising: a fiberizer adapted to form fibers from a source of molten material; a blower for directing the fibers from the fiberizer toward the conveyor to form a fibrous pack; at least one liquid dispensing system connected to a source of liquid for spraying the fibers with said liquid, wherein the at least one liquid dispensing system is selected from systems for delivering coolant liquid, binder dispersion, binder diluent or combinations thereof, wherein there is at least first and second dispensing systems connected to respective sources of first and second liquids for spraying the fibers with said liquids, wherein each liquid dispensing system has a separate set of a plurality of control valves for setting the flow of liquid delivered by the liquid dispensing system of one fiberizing unit independently from the flow of the liquid delivered to the liquid dispensing system of a different fiberizing unit, the first and second liquid dispensing systems being dispensing systems for a coolant liquid and a binder dispersion a plurality of nozzles for dispensing liquids onto the fibers, wherein the nozzles are optionally adapted for atomizing the liquids as they are dispensed, using either the liquid itself or a second atomizing fluid; a sensor for measuring at least one of (a) the ambient temperature, and (b) the ambient humidity to obtain a model input measurement; a fluid control system for varying the rate of at least one liquid delivered to at least one fiberizing unit in response to a signal correlating to said model input measurement, wherein the at least one liquid comprises the binder dispersion; and an oven downstream from the fiberizing units for curing the binder in the pack; wherein the binder dispersion is a formaldehyde-free curable binder dispersion and wherein the nozzles for dispensing the binder dispersion are adapted for atomization so that the formaldehyde-free curable binder dispersion is sprayed onto the fibers as an atomized stream, wherein atomization breaks the binder stream into droplets, and wherein the average size of the droplets varies from one fiberizing unit to another. a fiberizer adapted to form fibers from a source of molten material; a blower for directing the fibers from the fiberizer toward the conveyor to form a fibrous pack; at least one liquid dispensing system connected to a source of liquid for spraying the fibers with said liquid, wherein the at least one liquid dispensing system is selected from systems for delivering coolant liquid, binder dispersion, binder diluent or combinations thereof, wherein there is at least first and second dispensing systems connected to respective sources of first and second liquids for spraying the fibers with said liquids, wherein each liquid dispensing system has a separate set of a plurality of control valves for setting the flow of liquid delivered by the liquid dispensing system of one fiberizing unit independently from the flow of the liquid delivered to the liquid dispensing system of a different fiberizing unit, the first and second liquid dispensing systems being dispensing systems for a coolant liquid and a binder dispersion wherein there is at least first and second dispensing systems connected to respective sources of first and second liquids for spraying the fibers with said liquids, wherein each liquid dispensing system has a separate set of a plurality of control valves for setting the flow of liquid delivered by the liquid dispensing system of one fiberizing unit independently from the flow of the liquid delivered to the liquid dispensing system of a different fiberizing unit, the first and second liquid dispensing systems being dispensing systems for a coolant liquid and a binder dispersion a plurality of nozzles for dispensing liquids onto the fibers, wherein the nozzles are optionally adapted for atomizing the liquids as they are dispensed, using either the liquid itself or a second atomizing fluid; a sensor for measuring at least one of (a) the ambient temperature, and (b) the ambient humidity to obtain a model input measurement; a fluid control system for varying the rate of at least one liquid delivered to at least one fiberizing unit in response to a signal correlating to said model input measurement, wherein the at least one liquid comprises the binder dispersion; and an oven downstream from the fiberizing units for curing the binder in the pack;