When VOC drops below threshold, the exhaust fans should turn off only if the CO2 in the room is also below threshold. For it to work, edit the "filter" stage. If using Aqara, just uncomment the code in the "if" clause (delete the slashes "//"). Otherwise, just delete that 1 line and copy/paste a line from the help panel which enables you to turn off a plug/outlet from whatever service you are using.

If

TVOC level below threshold

This trigger fires when the TVOC level for a device falls below the provided threshold.

With

History of CO2 level above threshold

This query returns a list of when the CO2 level for a device rises above the provided threshold. Note: this query will only return future events after this Applet is created.

With

History of CO2 level drops

This query returns a list of instances when the CO2 level for a device fell below the provided threshold. Note: this query will only return future events after this Applet is created.

When

Filter Code

Then

Turns on/off plug

This action will turn on/off the plug of your choosing.

Turn off exhaust fan when VOC drops below threshold, but only if CO2 is also below threshold

If

TVOC level below threshold

With

History of CO2 level above threshold

With

History of CO2 level drops

When

Filter Code

Then

Turns on/off plug

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Turn off exhaust fan when VOC drops below threshold, but only if CO2 is also below threshold

Turn off exhaust fan when VOC drops below threshold, but only if CO2 is also below threshold

If

TVOC level below threshold

With

History of CO2 level above threshold

With

History of CO2 level drops

When

Filter Code

Then

Turns on/off plug

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Popular services on IFTTT