An eight-foot span between bar joists accommodates an exhaust fan opening framed with two-by-four Douglas Fir number one sub-purlins connected at each end with Simpson HF24NZ hangers. Four-by-four Douglas Fir number one blocking members span perpendicular between the sub-purlins and are tied with Simpson F44Z and LUS44 hangers at each end. Dimensions and locations are verified with the mechanical installer.
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