OUR STORY
PassiHVAC Limited is a UK-based building performance and ventilation company, founded in 2022, delivering natural ventilation, passive heat recovery, environmental performance modelling, and sustainable building design solutions across the construction and building services sectors. Our work is grounded in research-informed methodologies and aligned with UK regulatory frameworks, including Approved Documents Part L and Part O, CIBSE guidance, and emerging net-zero policy trajectories.
MEET THE TEAM
Our team is made up of bright and like-minded individuals, who have come together to explore endless possibilities. We come from a variety of different fields and technical backgrounds, yet our passion for PassiHVAC Limited ties us all together. Check out the people who make PassiHVAC Limited the amazing company it truly is.
KAISER CALAUTIT
Founder and Managing Director
Kaiser is the Managing Director of PassiHVAC Limited and an Industrial Engineer with more than 40 years of experience in the manufacturing, construction, oil & gas and steel industry working at some of the biggest companies like Toyota Motor Corp., Sumitomo Corp. and Arabian American Oil Company. Kaiser held several management positions and was involved in prestigious projects in Saudi Arabia, Kuwait and UAE.
Technical Director
Dr John is the Technical Director of PassiHVAC Limited and a leading UK expert in passive ventilation and low-energy ventilation systems. He is an associate professor in Building Technology at the University of Nottingham, specialising in indoor air quality and building performance.
An internationally recognised indoor air quality expert, John leads the research-driven development of PassiHVAC’s passive ventilation solutions, ensuring they are scientifically validated, regulation-ready, and aligned with UK net-zero objectives.
Sustainability Director
Murtaza leads the sustainability division at PassiHVAC Limited. He holds a PhD in building technology and specialises in building performance, environmental analysis, and evidence-based decarbonisation strategies, supporting clients across design, retrofit, and operational stages. He is a Carbon Literate professional, delivering Carbon Literacy training to built-environment practitioners to support climate awareness, behavioural change, and practical emissions reduction.
Research Director
Hao is the R&D specialist at PassiHVAC Limited, his expertise is in passive cooling design, building energy analysis and optimisation. With a dedicated focus on passive buildings, low-carbon structures, and sustainable architectural technologies, Hao excels in data analysis using Computational Fluid Dynamics (CFD) techniques and energy consumption simulation software. His proficiency extends to hands-on experience with extensive field experiments and wind tunnel testing.
ABDULLAH DIK
Technology Director
Dr Abdullah Dik specialises in sustainable energy technologies and renewable energy integration. His expertise includes electric vehicle (EV) smart charging, vehicle-to-grid (V2G) systems, and the integration of heat pumps with renewable energy sources to support low-carbon energy networks.
His work focuses on the interaction between EVs, smart grids, and energy-efficient buildings, contributing to resilient and scalable solutions for carbon reduction and the transition to net zero.
Administration and Finance Director
We trust Nida with all of our business needs at PassiHVAC. Enthusiastic and curious, she proves that no feat is too big to tackle. From business and administrative support to finance operations, you want her in your corner.
NIDA SANTOS
Want to meet a member of our incredible team? Give us a call.