After looking at your photo I'm fairly confident that this is your problem... you are trying to pump HOT air down toward the floor. Hot air rises along with your fumes so it's easy to pump those fumes up and out. You might possibly get away with pumping them down only if you had a very powerful fan located before the ducting starts to get directed down. Instead your fan is located on the floor after a long run of curved flexible tubing. Every curve, turn or elbow joint really hurts the efficiency of your system further. Unfortunately most of the fumes aren't even reaching that fan.
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