# Systemair with ctm lyng
**URL:** https://community.homey.app/t/systemair-with-ctm-lyng/126390
**Category:** Questions & Help
**Tags:** homey-pro
**Created:** [January 3, 2025, 2:57pm UTC](https://community.homey.app/t/systemair-with-ctm-lyng/126390 "2025-01-03T14:57:49Z")
**Posts on this page:** 8
**Page:** 1
### Author:  [@Sindre\_Johansen](https://community.homey.app/u/Sindre_Johansen)
#### Post date: [January 3, 2025, 2:57pm UTC](https://community.homey.app/t/systemair-with-ctm-lyng/126390/1 "2025-01-03T14:57:49Z")
Hi, I’m new to this and wondering what I might be doing wrong.
I have two bathrooms that I want to control based on humidity levels. I have a humidity sensor in each bathroom from CTM Lyng. I want to control my Systemair unit.
This flow works when the humidity level increases, setting the fan speed to high. The problem is that when the humidity decreases again, it doesn’t reset the fan speed back to normal.
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### Author:  [@RoyWissenburg](https://community.homey.app/u/RoyWissenburg)
#### Post date: [January 3, 2025, 3:10pm UTC](https://community.homey.app/t/systemair-with-ctm-lyng/126390/2 "2025-01-03T15:10:33Z")
You cant use the all card, because it wil never happen that both levels decreases at exactly the same time. So the flow stops at the “all” card.
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### Author:  [@Sindre\_Johansen](https://community.homey.app/u/Sindre_Johansen)
#### Post date: [January 3, 2025, 3:15pm UTC](https://community.homey.app/t/systemair-with-ctm-lyng/126390/3 "2025-01-03T15:15:52Z")
Do you have a suggestion for how this could have been done?
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### Author:  [@RoyWissenburg](https://community.homey.app/u/RoyWissenburg)
#### Post date: [January 3, 2025, 3:21pm UTC](https://community.homey.app/t/systemair-with-ctm-lyng/126390/4 "2025-01-03T15:21:50Z")
most easy, change the all card in a any card. But i asume you have reasson for using the both.
So option would be.
Device 1 (less then 36%) and Device 2 is less then 36 (possible need the use of a logic card) then…
Similair for device 2… and Device 1
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### Author:  [@Sindre\_Johansen](https://community.homey.app/u/Sindre_Johansen)
#### Post date: [January 3, 2025, 4:17pm UTC](https://community.homey.app/t/systemair-with-ctm-lyng/126390/5 "2025-01-03T16:17:50Z")
So like this?
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### Author:  [@RoyWissenburg](https://community.homey.app/u/RoyWissenburg)
#### Post date: [January 3, 2025, 4:22pm UTC](https://community.homey.app/t/systemair-with-ctm-lyng/126390/6 "2025-01-03T16:22:45Z")
> [@Sindre\_Johansen](#):
>
> So like this?
Did you try it?
But as i can see looking ok, now also do that for the other part. because your told the first part was working.
Wondering realy need to both device have to increase or disgrees?? 2 bathrooms, so you dont mind when in bathroom 1 de humidity is to high??? if thats the case just change the all card for a any card like i said in the first answer
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### Author:  [@Sindre\_Johansen](https://community.homey.app/u/Sindre_Johansen)
#### Post date: [January 3, 2025, 4:49pm UTC](https://community.homey.app/t/systemair-with-ctm-lyng/126390/7 "2025-01-03T16:49:49Z")
Yes, it worked. Thank you so much! I want both bathrooms to have a humidity level below 36% before the ventilation switches back to normal.
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### Author:  [@Oystein\_Reksten](https://community.homey.app/u/Oystein_Reksten)
#### Post date: [January 3, 2025, 7:52pm UTC](https://community.homey.app/t/systemair-with-ctm-lyng/126390/9 "2025-01-03T19:52:54Z")
Sorry, det var denne med all kortet som ikkje fungerte.
Så eg laget èin med flow med stopp fra kvar enkelt plass med eit logikkkort for motsatt føler eks. Stopp fra loft og logikkort fra føler i kjeller så begge må være under oppgitt verdi. Du setter selvfølgelig berre at ventilasjonen skal gå tilbake til normal hastighet.
