Air purifiers are a separate device type in the Apple Home.app, yet Home Assistant does not allow exposing these devices as air purifiers using the HomeKit Bridge integration. Instead, they are exposed as fan entities.
It looks like we need to add a type_air_purifiers.py here for this to work:
https://github.com/home-assistant/core/tree/dev/homeassistant/components/homekit
It looks like one person on Github added this exact file to a fork here.
Any ideas? Thanks.