Burnham Mfg Blower Inlet Shroud Assembly [includes Gas Orifice; Gas Orifice O-Ring; (3x) M4x20 mm or (3x) M4x25 mm self-threading screws; Injector Plate; (4x) M4 x 10 mm flat head screws; Air Intake Adapter - Air Connection Side; Swirl Plate; (2x) M5 x 16 mm Phillips flat head screws; Blower Adapter Plate; Air Intake Adapter - Blower Side; Spacer Plate (for size 080 through 150 only)].