MDU Survey & Design Dealing with new, existing and inherited MDU plant can be a time-consuming and troublesome endeavor for any operator. SpanPro has field survey experts with the experience and patience to discern and document those MDU details necessary for a clean and non-intrusive build or upgrade. Let our survey and design team work with you to get broadband and high-speed data services into this densely populated and highly profitable plant with a minimum of difficulty.