Sodium-independent anion exchanger which mediates the electroneutral exchange of chloride for bicarbonate ions across the cell membrane (PubMed:29167417, PubMed:7923606). May be involved in the regulation of intracellular pH, and the modulation of cardiac action potential (PubMed:29167417). {ECO:0000269|PubMed:29167417, ECO:0000269|PubMed:7923606}. This is the function of Ensembl gene identifier ENSG00000114923 (SLC4A3, solute carrier family 4 member 3).