How To Detect People Coming In From The Drop Ceiling?

I have a customer that is nervous about someone coming in from the drop ceiling. The space above it is about 6 feet high, but there are air conditioning duct work going throughout it. He wants me to put a motion sensor there, but I am worried that the duct work will block it and make it that it wont cover everything properly. Is there a better way?

Thanks

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***** ** **** ******** ***** ** ***** *** ****? ***** probably ***'* ******** ** ***** **** **** ******* ***** ******.

* ***** ***** ** *** ********. ********** ******* ***** ** recently

***** ******** ***'* ******** ** ***** **** **** ******* ***** weight...

**** *** *** **** ****...

**** ******* **** **** ** ** *** ******* ***....

* **** ******** ***** ****, * **** ******* ********* **** this, ******* ********* **** ***** ***** **** *** ****** **** someone ***** ****** **** ******. ******* ** **** ******** ** not *** ******* *******, ** ***** ****** ******* ******* ******* the **** **** ** * *********** ****

**** ** ********* ********** *** ***** ***** *** ******* **** now? ** ** **** * ********* ******, *** ***** *** internal ******* ******** *** ******?

**** ******** ********* ******* **** *** *********** ****** ********* *** installed. (****/*******)

** *** *** **** * $***.**+ ****** *** ******, *** they *** ** *****.

***** ******* *** ** ****** ********* ****** ****** ******* ***** while *** ******* ****** ** ********.

****** ********* *** ** **************. **, ** *** ***** *****, the *********** ** *** *** ****** ******** *****, *** ************ will **** ** ** **** ** ****** ***** *********** **********/********* to ******* *** *** ****** *********. ** ***** *****, *** HVAC ****** (** *** ****** *********) ****** *** ********* *** ceiling ******* ******* ********* **** *** ******** ***** . . . ** ******* . . . ** ******* . . . **** ************.

**'** ******* **** **** ***** ***. ** ******* ****** *** Detectors. **** **** **** *** **** ******** *** ** ** these **********. ** **** ***** ***** *** *******. *** ** above * ***** **** ** ***** **/*, *** ***** *** are ********** ** *********** *****, **** **** **** ******* ** the ******. *** ******** ******* *** ** **** **** **** the ************* ** ** **** **** **** ** ** ** the ****** **** **** *****.

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* ***** *** *** ******* ****** *** ******* *** ******** sensors *** **** ******* ****** ** ******** ******* ** *** ceiling

* *** * ******** ******* * ********* ****** ** *** drop **** **** *** ** **** ** ********. *** ***** (and ****) **** **** **** ******, *** ****** ******* ******* a **** ** **** **** *** *** *********** **** ******* the ********. ******** ****** **** ****** **** ** ****** ********...*** proved ** *** **** **** *** ***** ******** ****** ** security.

* ****** ** * **** **** **** *** **** * setup. ***** * ***** *** ******* *** ********, **** ******** the ******** ****** ** ***** ******* *** **** **** *** over *** ****, **** ***** * *** ** * **-**** zone **** *** ******* ***** **** *** ********.

************* ****** ******* ***** ** *** **** *** ***** ** this *** * *** ** ****** ** ***** **** * went **** *** ******** ******* ** **** ** ****** ******* wire...

*** ** ****** ** "*** ***** **** ****"... *'* *** if ******* ** ***** ** ***** ** *** ********, ***'* want ** *** *** *** ***** **** ********. *************, *****'* usually ***** ** ** ****** ******* ***** **** ****** **** for *** ** **** ***** ** * *******, ******* **'* above ** ***** ***, ******* ***, ******* *****.

***** **** ******** ** **** *** ** *** ***** ****** between ***** ***** **** ***** ***** (*******-********** ********, **** *****, etc.), *** ***** ** *** ***** ****'* **** ** ****** (storage ****, ******, ***.). ******** ***** ***** ******, *** ***** them.

***********, *** ***** ******** *** * ****** ***** ******* ** there, *** *** **** ** ******* ****** ** ******** */*, or ** */* ******* ** *** ***, **** **** ***** motion ********* *** ** *** ***********. ***'** ******** *** ****** to ** *********** ****** ** *** ******* *****, *** *** major ****** ** ********, ******* **** ******* **** * ********** or ******* ******* * ****, **** ******** ** "******" ** the ******. ****** * ***, **** ***** ** ************ "****" to ****, * ****** **** ******** *** ****** ** ***** anywhere ****** *** ***.

*'* *** ** ******* ** ***** ** ***** ** *** ductwork...

***** ******** ** **** ;)

*** **** ***** *** ****? :)

*** ***** **** **** * ******** ***

*** *** **** ***** *******

****** **** ******** *** ** ********* ** ***** ******

* *** ***** * *** ** **** ***** ***** "****** detectors". * **** ********* **** ******* ****** **** ** *** day ** **** ***** *** ******* ********** *** ***** *** that ** *** ****** **** *** **** ***** *** ******* normally **** "***" **** ** *** **** ** ******** ** at ***. ** *** *** ***** *** *** *****, ***** and *** ***** **** **** * ****** ** *** **** that *** **** ** ********** ** ******. * **** ******** "curtain" ***'* **** **** ******* ** ****** ******, *** **** kid ******** ** *** ****** ** ***'* *********. ****, *** a ****** ****** ** *** **** ** *** ***** *** assume *** ** * ****** **** ****** ***** ***** *** mainly * ***** ******* "**** *** ** *** ***" *** create * ******** *** **** *************.

"****, *** * ****** ****** ** *** **** **"

**** ** *** *** ****** ********* :)

**** ** *** ** *** **** *****

** * ******** ******* ** *** ***** ********** ****** ** detect ******* *********?

+* *** ****

**** ******'* ****** ** ****

#*, **** ** *** ***** ** *** ****? *** *** is **?

**** *** ********** ******** ***** ***** ****** *** *********? ** may ** ****** ** *** **** ******* ** **** ***** all ************, *** **** **** **** *** ******* ****** ** seems **** *** ***** ******** *** **** **** ***** **** would ***** ** ****** ***** ******* ***** ** ***** ****.

** *** **** * **** ***** ******, ******* *** ********* the ***** *** ******* ** **** ********** ****. ** ***** you **** **** **** **** ******** *** ***** ******* ******** over ** ******** **** ** *** **** *** "******".