> For the complete documentation index, see [llms.txt](https://docs.getdor.com/dtm-docs/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.getdor.com/dtm-docs/hardware/installation/doorway-compatibility.md). # Doorway Compatibility The sensor is designed to operate in indoor conditions for standard doorways that allows frequent ingress and egress. The sensor may be top-mounted on door frames that are up to 8ft (2.4m) wide and 12ft (3.6m) tall.
### Where is the sensor mounted? The sensor must be mounted directly on the doorframe on the inside of the space. In a retail environment, it must be visible from inside the store. ### Can I mount the sensor on a ceiling? We strongly recommend the installation of the sensor on a door frame due to height, width and traffic requirements. Under exceptional circumstances, ceiling mounting is allowed using an optional ceiling mount adapter which can be supplied by Dor team. ### What if my door is taller than 12ft? Due to the nature of the thermal technology, accuracy degrades substantially when the sensor is further away from average human height. ### Can I install multiple sensors on a wide doorway? We do not recommend installing sensors on doorways that are wider than 8ft. Installing multiple sensors on the same doorway may degrade the accuracy of foot traffic data. ### Can I install the sensor on elevator door frames? Due to individuals entering or leaving an elevator in a dense group at the same time, the sensor's accuracy may suffer. Instead, we recommend that sensors are deployed in doorways leading to elevator banks where possible.