How should the annular spaces around vent penetrations in outside walls be treated?

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The proper approach to handling the annular spaces around vent penetrations in outside walls is to permanently seal them. This is crucial because sealing these spaces effectively prevents the infiltration of air and moisture, which can compromise the integrity of the building structure and potentially endanger the efficient operation of the venting system.

Permanently sealing these areas ensures that harmful gases, such as carbon monoxide, do not leak into the living spaces, providing an essential safety measure. Moreover, it aids in maintaining energy efficiency by eliminating unwanted drafts and thermal loss that could arise from unsealed gaps. Proper sealing also helps in preventing pest entry and reduces the risk of mold and other moisture-related issues.

While temporary sealing might be useful for initial construction phases or testing, it does not provide the long-term solution needed for safety and energy efficiency. Leaving the spaces open for ventilation contradicts the need to create a secure and controlled environment and can lead to the very problems that sealing is intended to prevent. Similarly, using duct tape is not a permanent solution and might degrade over time, failing to provide the durability and protection required.

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