Lack of air coming from dash vents on Dodge Ram.?

The blower motor sounds like it is doing all it can do but there is very little air coming from the dash vents. Anyone know if there is a cabin air filter for the air conditioner. Or does anyone know what the problem might be?
Lack of air coming from dash vents on Dodge Ram.?
I don't believe U.S. cars have cabin air filters. It sounds like the air doors in your duct work are not operating properly. They are usually vacuum controlled.