Only the proportion of openings which can be opened with a very low risk of occupants falling from height should be considered to form part of the overheating mitigation strategy.
Dim ond cyfran yr agoriadau y gellir eu hagor gyda risg isel iawn y bydd preswylwyr yn disgyn o uchder y dylid eu hystyried yn rhan o'r strategaeth liniaru gorgynhesu.