Mechanical · IMC 2021 §607.1.1 / §607.5
Horizontal Duct Between Shafts: Dampers at Shaft Penetrations
Elevation of a duct leaving one shaft and entering another: no shaft enclosure is required around the horizontal run when the penetration into each shaft is protected with a damper.. Referenced to IMC 2021 §607.1.1 / §607.5.
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