Window types which allow good ventilation

Louvres offer the maximum ventilation and modern versions have greatly improved weather resistance. Unlike all other window types, casement windows can be used to catch breezes blowing parallel to the window, so are a good choice when the summer wind direction is variable (see picture below). Double-hung (sash) windows offer a choice between high and low-level ventilation. Awning (hopper) windows can be left open in wet weather but their ventilation potential is poor.

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