Fire-Check Internal Door CasingProduct Information Fire check softwood door casings that can be retrenched are high quality, fire resistant framing components designed to enhance both safety and style. Made from softwood materials such as pine, spruce, or fir, these casings are treated with fire retardant properties to meet building safety standards and help slow the spread of flames in case of a fire. The retrenchable feature allows for easy resizing or modification, ensuring a