rRNA N6-methyltransferase that specifically methylates the adenine in position 4220 of 28S rRNA (PubMed:30531910, PubMed:31328227, PubMed:31695039, PubMed:31799605). N6-methylation of adenine(4220) in 28S rRNA is required for translation (PubMed:30531910, PubMed:31799605). {ECO:0000269|PubMed:30531910, ECO:0000269|PubMed:31328227, ECO:0000269|PubMed:31695039, ECO:0000269|PubMed:31799605}. This is the function of Ensembl gene identifier ENSG00000168228 (ZCCHC4, zinc finger CCHC-type containing 4).