Airbricks have been used in traditional construction for centuries and have changed very little in style or shape. During the Victorian times cast iron was used to produce more elaborate and decorative airbricks and they became an architectural feature as well as improving ventilation under suspended timber floors. Today cast iron is still a popular choice of material to replace or install airbricks in period and listed properties. It is important to regularly check your airbricks to ensure they are unblocked and free of any nearby plants or bushes that may make them ineffective. Airbricks are needed either side of the house to allow the free passing of air to prompt circulation.