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- The heat flow from the interior passing through the glazing. This depends on the difference in temperature between the internal surface and the external surface of the glazing and the energy efficiency of the glass unit.
- The exchange, by convection, with the external air.
- Heat loss by radiation mainly to the sky. Various studies and measurements carried out show heat exchange by radiation is relatively limited in overcast weather. However, when the sky is clear at night, there are significant heat losses to the sky.
- Avoid drying wet clothes inside if possible.
- Ensure all rooms are vented.
- Position radiators under windows and keep curtains at least 15-20cm clear of glass for free movement of air.
- Open windows for a few minutes each day to permit air changes.
- After a bath or shower, close the internal door and open a window for a few minutes.
- When cooking, close the internal door and open a window if possible.
- Install extraction fans in kitchens or bathrooms if you have persistent problems.
- In conservatories, trickle ventilation in the wall, eaves and ridge zone can help.
- Close the door, engaging the latch.
- Lift the handle up fully.
- Insert the key and turn one full revolution – anti-clockwise where the handle is on your left hand side and clockwise where the handle is on the right hand side.
- Insert the key and turn one full revolution. If the handle is on the left hand side, turn the key clockwise one full revolution and anti-clockwise if on the right.
- Push the handle down fully
- Turn the key once more as far as it will go until it releases the latch and the door will open. For a handle on the left hand side, turn clockwise.
- Open out the window sash by about 20mm (just under 1 inch).
- Place your fingers against the rubber gasket and slowly pull the sash in until it just touches the fingers. Take care to do this gently so you do not injure your fingers.
- Then close the handle and you should feel the locks engaging.
- You will know if it is engaged by trying to push the window open. If it doesn’t move it is correctly engaged on the vent setting.
It is important that you make sure all occupants are familiar with these restrictors and can release them in case of an emergency.
To release the window restrictor
- Open the window sash fully as far as it will go
- Pull the window sash back in slightly – (1/2 inch or 10-12mm)
- Push down on the restrictor arm and pull inwards. This releases the restrictor and allows you to open the window sash fully. When you close the window sash the restrictor will automatically engage.