1. Boilermakers also install refractory brick and other heat-resistant materials in fireboxes or pressure

2. Boilermakers also install refractory brick and other heat-resistant materials in fireboxes or pressure vessels.

3. The Andiron dogs or billet bars keep the flaming logs in the firebox of the fireplace as they burn and settle

4. One-piece utility outfits first appeared in the mid 1800s, as ‘Boilersuits’ for crawling into the firebox of coal-burning steam vessels for cleaning, where a gap between jacket and pants could catch on the tight hatch of the ‘firehole’ (where coal is shoveled into the burner)