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The SMART Air Hood balancing instrument comes standard with a 2 ft x 2 ft (0.6 m x 0.6 m) opening but can also be used with other diffuser / register sizes using this adapter base kit (A-SAH-BK) and various adapter hoods. The assembly of the adapter hoods begins with the adapter base kit A-SAH-BK. Only one adapter base kit is needed, as it can be used with any of the adapter hood sizes.
