What type of vent is not suitable for high-efficiency appliances?

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High-efficiency appliances typically operate at lower stack temperatures and produce a high volume of condensation. Type L gas vents are designed for use with appliances that produce combustion gases at higher temperatures, such as conventional heating units. These vents are constructed to withstand the higher temperatures associated with the products of combustion.

In contrast, high-efficiency appliances require venting systems that can accommodate lower temperatures and the possibility of condensate forming in the venting system. Other vent types, such as Type B, Type B-W, and Type C, are designed for appliances that operate effectively at lower temperatures and are more compatible with the condensation and efficiency levels seen in high-efficiency equipment.

Thus, Type L gas venting is not suitable for high-efficiency appliances due to its design parameters, which cater to traditional venting needs rather than those of modern, high-efficiency systems.

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