What is a Duct Detector/ Duct Detector Key Switch? 

Thank you!

Neat Idea

Keys, buttons, or magnets do not constitute a functional test of a device.

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Neat!

That sounds about correct!

I think the smoke detector was also redistributed by Gamewell or GamewellFCI at one point, if I remember correctly.

NJMoo3652 cool

firefreak57 that is correct

Told ya is an apollo

Well... You get the point

S.E.R. Safety I don't think this "risk" is very common, as most duct detectors would probably be installed in areas like mechanical rooms that house large HVAC things, behind walls, or above drop ceilings. Either way, there aren't 30 foot two sided ladders. Therefore, you'd have to use an aerial lift, which aren't very dangerous. Also, with many fire marshals, smoke in the chamber is the only way of testing smokes. Because a keyswitch is only going to test if the device shorts the circuit and the rest of the system works, not the detector itself.

As long as the base fits the head yes.

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Apollo Series 65 Ionisation smoke detector

Space Age IAVLSH24

No

Old enough to know not to give may age out on the internet. :D

haha!