A novel inbred maize line designated PHAVN and seed, plants and plant parts thereof. Plural, generally rectangular pans are interconnected to each other and are each provided with at least one end wall having a recessed portion so that excess liquid in one pan may spillover into an adjacent pan before spilling over onto a floor supporting the leakage containment system. The wafer is positioned over the platen so as not to contact the platen and provide a gap between the platen and wafer.