Air Handler Supply Duct Flange; Item Duct Flange; Used On Item Multi-Position Air Handler; Used On Model/Brand TAM4/TAM9/TAM7, Air-Tite; Used On Item Part No TAM4A0A18S11ED, TAM4A0A24S21ED, TAM4A0A30S21ED, TAM4A0A36S31ED; Applicable Standard ETL (Canada and US), AHRI; Fits Cabinet Size B