Radon can enter a new extension or conservatory by a number of routes, with the result that radon levels may also increase inside the existing house. This leaflet describes how to minimise the amount of radon entering the new building, and discusses the additional protective measures it may be necessary to install during its construction. It will be of interest to anyone involved in reducing indoor radon levels.
This paper presents the results of monitoring the ventilation in Netley Infants School in Hampshire. The study was carried out on behalf of the Department of Trade and Industry as part of the Energy Performance Assessment Project, as managed by the Energy Technology Support Unit. The school was designed so that during the summer the solar heating of a south facing conservatory would enhance the stack effect and induce ventilation in the adjacent classrooms. It was expected that ventilation rates would be adequate to maintain comfort conditions and air quality.
A heat recovery system reclaims heat from outgoing stale air, supplying it to incoming fresh air. The energy benefit is greatest if it supplies all the fresh air to the house and none enters via uncontrolled openings, hence ventilation heat recovery (VWR). A sunspace (or conservatory) attached to a dwelling will almost always be at some temperature above ambient. Heat losses by conduction through the adjacent building fabric and ventilation losses via cracks will be reduced.
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