Chemistry Labs, 1200 mm (4 ft)

External Size (L x W x H): $3 \text{ ft (L)} \times 2 \text{ ft (W)} \times 1.5 \text{ ft (H1)} + 2.5 \text{ ft (H2)} This indicates a Length (L) of 3 ft and a Width (W) of 2 ft. The total height is composed of H1 (likely the height of the divider above the tabletop) which is 1.5 ft, plus H2 (likely the height of the tabletop from the floor) which is 2.5 ft. Internal Dimensions: The overall size listed above is also referred to as the Internal Dimenntions (likely the space allotted for a single user, excluding the material thickness, though the drawing suggests the overall footprint).