Illinois Energy Conservation Code Training and Support Program
2012 IECC - Frequently Asked Questions - 2012 IECC
IV. BUILDING MECHANICAL SYSTEMS
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Q: Citing 2012 IECC, Section R402.4.2 the language of the 2009 IECC was revised to replace the aforementioned requirement for gasketed doors with a requirement for “tight-fitting flue dampers.” However, the language for “gasketed doors” appears to have been retained in new text added to the “Fireplace” entry of Table R402.4.1.1, reading, “Fireplaces shall have gasketed doors.” What is meant by this provision?
A: To be clear, we interpret the combined effect of Sections R402.4.2 and Table R402.4.1.1, to require both “gasketed doors” and “tight-fitting flue dampers,” for “masonry fireplaces” constructed in accordance with IRC R1001 (NOT UL 127 “factory-built” fireplaces). Note also that the 2012 IECC, R402.4.2, and 2012 IRC, R1006, require factory-built and masonry fireplaces to be equipped with a direct supply of outdoor combustion air.
Accordingly, and solely for “factory-built fireplaces,” we recommend pursuing relief from the proviso for “gasketed doors” administratively vis-à-vis IECC Section R101.3 (“… this code is not intended to abridge safety … requirements contained in other applicable codes or ordinances.”) and Section R102.1 (“… provided that such construction, design … has been approved by the code official as meeting the intent of this code.”). (2012 IECC Table R402.4.1.1, R402.4.2)
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Q: Is the installation of an air curtain a suitable alternative to the vestibule requirements of 2012 IECC Section C402.4.7?
A: No. Doors opening into spaces greater than 3,000 square feet, that are intended for the public as building entrance doors and not otherwise dedicated to employees, a dwelling unit, guest room, material handling, mechanical equipment or electrical service function, are required to be provided with a vestibule.
Note however, it is at the discretion of the designer to select the path to energy code compliance most appropriate to the circumstances and the owner’s project requirements.