33 Inch Multi-Fire XD Electric Firebox Product Specifications. Depth: 9.5 in. Firebox Depth: 8.9 in. Firebox Width: 24.1 in. Height: 23.88 in. Nominal Depth: 10 in. Nominal Height: 24 in. Nominal Width: 33 in. Width: 32.87 in. Subscribe to our Newsletter. Dimplex PF3033HG – Insert Fireplace. Max BTU Input: 5118….