Typical coverage is a 12' x 12' area with the sensor at a height of 8', but it does depend on several factors such as room air flow, and where in the room the sensor is placed.
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But if you get close enough to a smoke detection device, the particles from exhaled vapour will act in the same way as cigarette smoke does. The particles if directly aimed at the device will set off the alarm – whether it's ionisation detection alarms, heat-based trigger alarms or optical alarms.
Can vapes be detected in airport security? Yup, it most definitely can be detected. Airlines do allow vape devices, provided you are not underaged and follow the rules on how it is packed, especially the one regarding no lithium batteries in checked in luggage.
The HALO can also detect when vaping has been masked by spraying another substance, such as a deodorant, to cover up the smell of cannabis or other vaping smells. A dynamic vape detection algorithm is used by the HALO to learn about the environment and alert when vaping is detected.
Vapes come in all shapes and sizes, with varying degrees of metal and plastic components, but many will set off a detector when you pass through it. If the cartridge contains hard plastic or zirconia ceramic, there's a chance it'll get through, but there's no guarantee because of what's beneath the surface.
Any amount of ionizing material can set off the nuclear type. The optical types require a bit more to interrupt the beam enough to set off the alarm. Still, even cooking smoke can set them off. Just enough to disrupt the flow of ions in an ionization detector or reflect the light of a photoelectric.