Conservation vent without a spigot for small holes up to 75mm

Conservation cowled vents are ideal for deflecting exhausted air downwards and preventing back draughts in prevailing wind positions. They can also be used with a fly mesh, at an additional cost, supplied as a flat disc. The Con3 is the smallest conservation vent grille and also the lightest. It doesnt feature a spigot at the back therefore can be used to cover any small hole even a square or rectangle that is no larger than 3 x 3 inch (75 x 75 mm)