# Can I change "direction" on a ventilator? **URL:** \ **Category:** Questions & Help\ **Tags:** homey-pro\ **Created:** [March 9, 2025, 5:44am UTC](https://community.homey.app/t/can-i-change-direction-on-a-ventilator/132357 "2025-03-09T05:44:53Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![Kenneth\_WedMore\_Lund](https://sea1.discourse-cdn.com/flex025/user_avatar/community.homey.app/kenneth_wedmore_lund/32/128966_2.png) [@Kenneth\_WedMore\_Lund](https://community.homey.app/u/Kenneth_WedMore_Lund)\ **Post date:** [March 9, 2025, 5:44am UTC](https://community.homey.app/t/can-i-change-direction-on-a-ventilator/132357/1 "2025-03-09T05:44:53Z")
I’m thinking about mounting a ventilator in our bedroom, modulated by CO2 sensor in Homey Pro. Is it possible for me to control the direction of the air flow like: [IF] [sensor co2] \> “1000ppm” [then] 1. turn on ventilator direction OUT for 2 minutes 2. turn on ventilator direction IN for 2 minutes 3. turn off ventilator Ie. so I remove co2 air from the room and then “pull in” fresh outside-air. ---
**Author:** ![Rmb](https://sea1.discourse-cdn.com/flex025/user_avatar/community.homey.app/rmb/32/79135_2.png) [@Rmb](https://community.homey.app/u/Rmb)\ **Post date:** [March 9, 2025, 7:12am UTC](https://community.homey.app/t/can-i-change-direction-on-a-ventilator/132357/2 "2025-03-09T07:12:24Z")
You have to make that happen on the ventilator. Depending on the type of motor, you have to change something in the wiring, and install a switch to activate and deactivate the change. Are you willing to open your ventilator to do some rewiring? EDIT: if you remove CO2 from the room, new air is coming in from outside some where. Isn’t that fresh enough? ---
**Author:** ![JohanP](https://sea1.discourse-cdn.com/flex025/user_avatar/community.homey.app/johanp/32/119002_2.png) [@JohanP](https://community.homey.app/u/JohanP)\ **Post date:** [March 9, 2025, 8:48am UTC](https://community.homey.app/t/can-i-change-direction-on-a-ventilator/132357/3 "2025-03-09T08:48:29Z")
If it’s a DC motor in the fan, just swap + and - How to do that with a (probably 2) smart switches I would not know from the top of my mind…