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Seismic Curbs for rooftop HVAC systems withstand forces exerted by severe wind loads or seismic activity. Manufactured to seismic design criteria required by geographic location and according to varying specifications of rooftop units. Options include built-in filters, extra heights to accommodate sound traps beneath units, built-in roof pitch and pressure-treated wood nailer. Curbs are shipped to job site in one piece if trucking permits, or in minimum amount of pieces with corners welded. Thybar Corp., Addison, Ill.