Looking to improve air quality in our 1930 semi while carrying out extension work and general refurbishment. Therefore would be grateful for directions in terms of finding a company/specialist that could carry out ventilation calculations i.e. size up ducting/stack height based on air exchange rate, thermal conditions etc for passive ventilation system. Don't want to over-engineer it by installation forced ventilation of HRS as it is 1930s terrace (solid brick walls etc).
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