Tier 2 fans appear later in progression and are visibly stronger than the basic fans in two accepted playthroughs. The available sources do not give a reliable official unlock threshold or one exact action that awards them, so the acquisition formula is 待确认. Continue the normal production progression, watch the current unlock interface, and use the fans for higher-force transport only after they appear.
What the evidence actually confirms
Independent playthroughs show a later progression moment where Fan level two becomes available, and both demonstrate stronger force than the basic model. They also show players replacing weaker fans in more demanding transport routes. The general guide and official store description support fans as automation tools, but neither publishes the exact Tier 2 unlock condition.
Progress without chasing an invented threshold
Keep advancing the ordinary production loop and check the in-game unlock or purchase interface after major progression changes. If Tier 2 fans are absent, confirm that your current objectives and earlier production unlocks are complete rather than farming a number copied from an unsupported post. The correct current-build UI is stronger evidence than a guessed threshold extracted from one creator's run.
Use the stronger airflow carefully
Tier 2 fans can move products through routes that are too slow or inconsistent with basic fans. The same stronger force can push products past an intake, wedge them into corners, or throw them out of a shallow channel. Start with one fan, add side panels, and observe several cycles before replacing every fan in an existing factory.
Upgrade a route in controlled steps
Choose one congested segment, stop production, and swap only that segment to Tier 2 airflow. Re-test the entry angle, collection point, and any bumper interaction before changing the next section. This preserves a known-good baseline and makes it clear whether the new fan solved the bottleneck or created a new fly-out problem.
Information that remains 待确认
The official pages do not state a fixed feeding total, purchase price, or exact phase checkpoint for Tier 2 fans. Video timing proves that they arrive later, but timing within one run can depend on the player's order and version. Until a current official UI or developer source supplies the condition, any precise unlock formula should remain unpublished.
Sources used for this answer
These links are the accepted evidence set for this page. Player methods are kept separate from official or developer statements, and unsupported details stay marked 待确认.