Long Hit & Miss Vents Help and information on all topics relating to your central heating, air conditioning and ventilation issues.

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Hi, anyone know if I can get long Hit & Miss Vents? Back door has six ventilation holes covered by a 66cm Louvre. Councils idea back in the day of gas ventilation. All I can find are one brick (9 by 3 inch) which would mean laying three side by side. Cheers