WD 10 W x 3-1/2” D STL 45 Deg INT Elbow. Wallduct is commonly used in the healthcare market to feed wires and cables from electric and communication cabinets to X-ray and MRI equipment. See typical application shown. Because some healthcare equipment requires nonmetallic material in the surrounding area, aluminum Wallduct is used in scan rooms. The equipment and control rooms generally use steel Wallduct.