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louver

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    Alteration adding PTAC Louvers on envelope in Comcheck

    I have an alteration project that needs to add louver openings on existing building for new PTAC's in some dwelling units. As per code, if the mechanical penetration area (PTAC Louver) is more than 1% of opaque above grade wall, it needs to be entered as a separate wall component with U-0.5 in...
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