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410 <br /> 4. Important in the above unit evaluation is that they are each equally <br /> supported by two roof trusses (or close to it), per usual construction <br /> practice. Provided is a working sketch showing wood roof curbing <br /> recommended to ensure two trusses support each unit. <br /> 5. The two major HVAC units (one new, one replaced) on the major <br /> glulam beam are centered on the beam, or close to it, and require no <br /> formal calculations. This is due to load distributing curbing and their <br /> restricted base dimensions. Their moment loading on the front to back <br /> trusses is minimal. By inspection their placement is acceptable without <br /> formal evaluation, largely by their direct support by the major beam. <br /> 6. The two new hoods, 11-foot wide and 3-foot wide, are supported <br /> internally by new post supported 4"x 8"cross overhead beams. Beam <br /> posting is to the tenant space side wall and a new interior front to back <br /> wall. The interior wall may be OSB/plywood sheathed for general lateral <br /> post stability. <br /> 7. The beams are adequate by calculation for the larger hood and smaller <br /> hood. Calculations for beams attached. As noted, all beam ends will be <br /> posted in walls. Connecting hangers should be Simpson or equivalent for <br /> the 4"width beams ("high strength" not required; any standard 4" hanger <br /> is acceptable for this installation). Special post footing installation not <br /> required. The existing concrete slab is adequate for the relatively small <br /> post loading. <br /> 8. The roof-mounted installation of a minor bathroom fan and other minor <br /> installations in the rear portion of the tenant space is possible. Their <br /> installation is adequate by inspection, based on the truss capacity <br /> calculations and noting that,the truss spans are short in that area (20'). <br /> Summary. <br /> 1 Exhaust hood fans and MUA installation require no roof alteration, but <br /> do require post and beam blocking from below under affected trusses to <br /> reduce the effective span of the 40-foot long front area roof trusses. (To <br /> be clear, the blocking of the trusses from below is the shorten the effective <br /> truss span, not to provide direct support for the new installed units.) <br /> 2. The new/replaced HVAC units will rest directlyon the existing major <br /> cross beam. Their installation in that location is adequate by inspection <br /> and no formal evaluation is provided. <br /> 3. The kitchen hoods may use the new interior 4"x 8" cross beam support <br /> framing. <br />