Did you seal outside vents after Residential refer install?

I custom tailored my vents to provide the ultimate in convection. The register at floor level and left the original stack flue vent. One of the things that works well is to put a very very very low CFM 120vac muffin fan blowing upwards from the bottom of the condenser. It reduced my 24vdc daily amp hour consumption by >10% and that ain't peanuts. It would do similarly with AC kWh. Less compressor run time.