95 Heater air flow issue

Have a 95 EX that I just bought. The fan comes on at various speeds correctly (you can hear the different speeds), but there is no air flowing out of any vents - neither defrost, vents, or leg positions.
Recirc also seems to work okay as the flow sounds considerably louder when enabled - but again, no actual tangible flow.
I have been told that there is a blockage, but wanted to confirm and get some idea where to start.
Also, there may be no working A/C, but I don't really care about that issue yet. I can try a recharge if I can solve problem #1.
Finally, a custom air intake (under hood) was installed by the previous owner. Don't know if that could be contributing.
Thanks, John
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