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The British Standards Institution
As the world’s first national standards organisation, BSI British Standards has a globally recognized reputation for independence, integrity and innovation in the production of standards and information products that promote and share best practice. It is

The Chartered Institution of Building Services Engineers
CIBSE is the prime source of expertise for sustainable buildings. We harness our members' skills and knowledge to raise competence across the industry.

The Institution of Engineering and Technology
The Institution of Engineering and Technology is one of the world’s leading professional societies for the engineering and technology community. The IET has more than 150,000 members in 127 countries and offices in Europe, North America and Asia-Pacific.