Sterling TUBULAR GAS FIRED DIRECT SPARK PROPELLER UNIT HEATERS GG-30 User Manual | Page 4 / 44 | Original mode | Also for: TUBULAR GAS FIRED DIRECT SPARK PROPELLER UNIT HEATERS GG-60, TUBULAR GAS FIRED DIRECT SPARK PROPELLER UNIT HEATERS GG-105, TUBULAR GAS FIRED DIRECT SPARK PROPELLER UNIT HEATERS GG-120, TUBULAR GAS FIRED DIRECT SPARK PROPELLER UNIT HEATERS GG-45, TUBULAR GAS FIRED DIRECT SPARK PROPELLER UNIT HEATERS GG-75, TUBULAR GAS FIRED DIRECT SPARK PROPELLER UNIT HEATERS GG-90