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Airflow rates of 1800 CFM or more ** Factory Set Heating Speed 2. Temperature rises in the table are - Not Recommended 3. Temperature rises and airflows These conditions are not recommended. INSTALLATION REQUIREMENTS • NFPA-90B - Warm Air Heating and Air Conditioning Systems. Requirements and Codes This furnace must be installed in accordance with these instructions, all applicable local building codes, and the current revision of the National Fuel Gas Code (ANSI-Z223.1, NFPA-54). The current re