Fireplace Blower Fan Kit for Heatilator Majestic Vermont Castings Rotom HB-RB74K. Hongso GFK4 FK4 Fireplace Blower kit for Heatilator, Majestic, CFM, Vermont Castings, Monessen, Rotom HB-RB74K R7-RB74K. Blower total Length = 12.5″ Width = 3.73″ Height = 3.23″ Flange Opening = 9 1/2″. Insulation Class H (rated to 392°F /…