80/140

80/140 insulated chimneys are designed specifically for smaller heating appliances that require a smaller diameter for efficient operation, while still providing a high-quality and safe solution. This designation indicates the chimney’s two main dimensions:

80 mm: The chimney’s internal diameter. This is an optimal choice for gas boilers or smaller fireplaces and stoves that use little fuel.
140 mm: The chimney’s external diameter. This provides enough space for a high-quality insulation layer, which keeps the chimney’s outer surface cool and safe.