The regeneration air can be reduced be reducing the setpoint temperature on the heaters. If you’re in a design stage, you might want to choose a bigger model with a lower regeneration temperature to satisfy the same capacity requirements. Another way to reduce the regeneration temperature is to increase the flow rate. If increasing the flowrate with the built-in fan, be aware that the backpressure will put a limit to the increase. If required, you have the option to add a booster fan to pull more regeneration air.
Generally, the regeneration air temperature will become higher if the water content in the room becomes lower. Thus, reconsider the setpoint requirements – if the requirements are strict.