No air out of the front vents with hot or cold settings

Hello, If you hear the fan running in the front, but there is no air from the vents, I would start by checking the cabin air filter for the front. The rear has an entirely separate system. If the blower motor is not running, check your fuses first, then, if there is a blower motor control module instead of a blower motor resistor, diagnostics should start there and with the blower motor.