Looking down for architectural features in any Georgian town and as well as coal hole covers, manholes and the like you'll see all manner of air bricks and grilles, mostly for sub floor ventilation in property walls. Here is an illustration of a cast iron vent underneath a front door in Regency Bath. Like many it's in a pretty poor state. This one's patched up with steel plate and it's suffocating, what is a key part of the ground floor causing damp. Prevent damp in period property basements and below suspended floors...
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Conservation Vent Grilles
Architectural Cast Iron Ventilation Gratings and Grilles in any RAL colour
Cast iron air bricks and mesh - a solution at last
Floor Heating Pipes - Libraries, Palaces, Conservatory, Church, Orangery and Public Buildings