The servo is run from the 5V supply which is rated for 1.5A but subtract about 500mA-700mA for the Pi/HeaterMeter/Wifi. The blower is mostly constrained by the input power supply. I've tested up to 1A continuous, but you should be able to go beyond that. Anything much higher you might need to remove the inductor and run in "Pulse" mode instead of voltage mode.