original late 19th century patented american interior residential fireplace gas insert or grille designed and fabricated by the dawson brothers of chicago, il. the ventilating gas grille contains a recessed region with multiple rows of closely spaced jets or burners. the surround with protruding hood is highly decorative, incorporating floral motifs arranged in various configurations. the perforated ash grate affixed at the bottom is free from cracks or breaks. the metallic gold enameled finish is mostly uniform throughout. the on/off gas key and damper handle are original and intact. the extant dawson brothers factory and offices is located at 517-519 n. halsted street just west of downtown chicago. the red brick factory was constructed in 1888 and designed by architect julius zittel. the five-story building has a cast iron facade on its first floor, along with decorative tie rods and a carved limestone name plaque with date. the dawson brothers used the factory to fabricate highly specialized ornamental fireplace mantels and grates; the building also served as the company's showroom and offices. a six-story addition was added to the building in 1901, which mainly served as a storage and shipping area. the dawson brothers conducted business at the factory until 1929. the building was added to the national register of historic places on february 14, 1985. Item measures 30 1/4"h x 24 1/2"w x 7"d.