No air blowing out of the vents?

The weather is getting hotter in my area. When I start driving on a long-distance trip, the AC/blower works fine for about 45 minutes. Then the air flow slows down until there’s no air blowing out of the vents. I can hear the blower working, but no air is coming out. These are the recent repairs that were done. New condenser, new compressor, freon levels are stable/normal. I don’t want to change the actuators to find out there is something else going on. If the actuator fails, could this close the vent doors? Any help or advice is greatly appreciated. Thank you.