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UCTRONICS PoE HAT for Raspberry Pi 4 with Case, 802.3at Power Over Ethernet Expansion Board for Pi 4 B Board, with Cooling Fan
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PoE HAT E for Raspberry Pi 4B/Raspberry Pi 3B+, Power Over Ethernet (PoE) Support 802.3af PoE Network Standard, Compatible with Raspberry Pi Official Case, Support Connecting Cooling Fan
RaspBerry Pi 4 with PoE HAT, fan not working (at all) · Issue #518 · home-assistant/operating-system · GitHub
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