Please choose the correct ending to complete the given sentence: Home and Garden: [header] How to ventilate a conservatory [title] Draw colder air into the conservatory. [step] If, for example, you have a south facing conservatory adjoining a north facing room, you should draw air in from the bottom of windows in this room to get a good draught of cooler air flowing into the conservatory. [title] Install roof vents.

Ending1: [step] Since heat rises it is sensible to have some form of ventilation in the roof of the conservatory and one or more opening roof vents, depending on the size of your conservatory. You will need to make sure that you specify ones that provide good sealing and that are water and draught proof. Ending2: [step] Most conservatory hoods will be made of metal, and you'll need to install these vents both inside and outside of your conservatory. Although not necessary, they should be decorative enough to reflect heat coming in. Ending3: [step] If, for example, you have a south facing conservatory, you should install roof vents around the outside of the conservatory. This will allow cool air to ventilate out of the conservatory. Ending4: [step] Although this is a less efficient system, you can improve the quality of your exterior ventilation by installing weatherstripping near the windows. Make sure you turn off the heating and ventilation accessories every few hours and screw up window timers if necessary.

Answer format: ending1/ending2/ending3/ending4