The Tjernlund HS2 Gas Sidewall Power Venter Fan is a robust solution for sidewall venting, ideal for renovations, new constructions, or replacing old chimneys. It's designed to save on materials and labor, especially in multi-story buildings.

Users have praised its efficiency and the included UC1 Interlock Control and PS1505 Fan Prover Switch Pair. However, some found the installation board challenging to navigate. Despite this, many appreciate the detailed instructions provided.

One user replaced a decade-old unit with the HS2 and reported flawless operation over two months. Another highlighted the unit's configurability and safety features, such as the reed pressure switch ensuring proper air movement.

However, not all experiences were positive. A user faced difficulties integrating the fan with their furnace and criticized Tjernlund's customer service for being unhelpful during troubleshooting. After persistent efforts and escalating the issue, they managed to get it working but advised mounting it away from the furnace to prevent overheating.

Overall, while the Tjernlund HS2 offers great value and functionality for many, potential buyers should be prepared for possible installation challenges and ensure compatibility with their existing systems.