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Such pans should be fabricated with sides at least 2” deep, with length and width at least 2” greater than the diameter of the heater and must be piped to an adequate drain. The pan must not restrict combustion air flow. clearances This water heater is approved for installation on combustible flooring (with NSF Leg kit #9003425205) in an alcove when the minimum clearance from any combustible construction is as indicated in Figure 6 and Table 4. In all installations the minimum combustible cleara