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The Contractor shall provide details of the design study to be carried out for heating and ventilating, including the drawings showing the general arrangement of the proposed layout. 

The buildings to be heated shall comply with relevant heat insulation regulations, and the calculations showing in the architectural drawings that the respective average heat transfer coefficient value of windows/external walls has been achieved shall be provided together with heating designs. 

In any locations constituted as an enclosed volume such as valve room, pump room, etc., natural circulation shall be provided. To do this, at least 2 windows, etc. opposing to one another shall be placed and insulated against external effects. 

## Ventilating 

Ventilation systems shall provide that buildings: 

- Coarse screen and inlet pumping station 

- Fine screen 

- Blower buildings 

- Return and excess sludge pumping station 

- Sludge dewatering building 

- Digester Control/Operation building (each room) 

- Workshop and Storage 

- Laboratory (Separate ventilation apart from Administration Building) 

- Primary Sludge, Thickened Sludge and Dewatering Facilities Feeding Pumping Station 

- Transformer Buildings 

- Emergency Diesel Generator Building 

- Service, Potable and Firefighting Water Pumping Station 

- Building for Chemical Phosphorous Precipitation 

Ventilation systems shall provide a safe working environment to comply with national regulations and to the key-principles given in Section 2.6.2. 

## 3.3.11 Pipe Materials 

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