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Hi, meem! Yes, two flue extensions can be used together for a 13-foot ceiling, but only if they are brand-specific, meet the manufacturer's maximum length limits, are of the same type (e.g., twin wall), and comply with all building regulations. You must check the flue system's specifications to ensure the combined length and bends are within the manufacturer's and relevant building codes, as well as considering fire safety clearances to combustible materials and proper ceiling support for the flue. - Patrick
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