There's a humidity module/timer/PIR you can attach but it's an extra £100+
The humidity one without PIR is about £35, I bought one yesterday.
Another happy icon airflow 30 user here. Worked fine since 2009, so well in fact that we are relocating it rather than replace it as we refit the bathroom.
We have the same, with the overrun timer. Its fitted into an airbrick and the cover flap things do a decent job of keeping the howling winds out.
@brokenbetty started
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There's a humidity module/timer/PIR you can attach but it's an extra £100+