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A small horizontal-axis wind turbine spins about a shaft that points into the wind and must turn so the rotor faces the flow. In this comparison a HAWT means a small machine on a business mast or associated with a building, not a farm-scale turbine dropped onto a retail park. The brand name does not tell you whether either machine will see a useful wind at hub height." } }, { "@type": "Question", "name": "Which is the better choice for an urban UK business site?", "acceptedAnswer": { "@type": "Answer", "text": "The choice comes down to the wind at hub height, not to which machine looks more modern. In smooth, directional wind with a clear fetch, a well-sited small HAWT is generally the higher-yielding machine for a given swept area. In confused flow a horizontal-axis machine may sit off-axis or spend time yawing, while a vertical-axis rotor may keep turning, but rotation is not useful annual energy. 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Vibration into an occupied building is a separate point for roof mounts of either type, and conservation areas, listed buildings, and noise-sensitive neighbours need amenity work before the base is ordered." } }, { "@type": "Question", "name": "What structural and safety checks matter on an occupied building?", "acceptedAnswer": { "@type": "Answer", "text": "A roof turbine is a structural and weathering design, not a bracket selection. Extreme wind, fatigue from turbulence, and vibration into the building usually matter more than static weight, and a structural engineer working to current UK codes should assess the host structure, fixings, and waterproofing. Commercial construction sits under Construction (Design and Management) duties, and safe access has to exist for the life of the machine, not only for installation day. Ice, debris, blade failure, people, vehicles, and overhead lines belong in the hazard assessment. A turbine warranty is not a structural sign-off, and a structural sign-off is not a yield guarantee, so read any exclusions for turbulent sites or roof mounting rather than inferring them from a stated design life." } }, { "@type": "Question", "name": "Will either machine automatically qualify for export payments, a grant, or MCS?", "acceptedAnswer": { "@type": "Answer", "text": "Parallel connection depends on the proposed capacity and on whether the system operates with the supply, not on vertical-axis versus horizontal-axis branding. The Feed-in Tariff is closed to new applicants, and the Smart Export Guarantee has its own eligibility rules, so do not assume a given turbine qualifies. Do not assume a grant or a certification, including Microgeneration Certification Scheme status, unless a current scheme document names that model. 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