can I put a PIR behind frosted glass or plastic?

[mgx]

I want to avoid putting unsightly alarm PIR detectors's up on internal walls as part of a refurb, and trying to see what the options are. There are small compact PIR's, but I'd prefer to avoid those as well. I also have the same problem with smoke detectors. Is it possible for me to put a recess (e.g. standard electrical socket depth, but perhaps the size of 2 x 2 gang sockets) up on the wall, then mount the smoke dectector and the PIR in it, and put a frosted glass or plastic cover over (the cover would be larger than the size of the recess, and would actually sit about 5-10mm out from the wall, so there will be air gap allowing the smoke detector to work. In the same recess, for one of the rooms, I'd also be mounting a wifi-antenna (repeater). Would this work? How has anyone else solved this problem?

 

[ricicle]

A smoke detector must not be baffled by anything!

 

[nozspark]

Have you looked at these PIR's? they fit in the same manner as recessed downlights and would be quite un obtrusive

http://www.tanealarm.com/catalog/ceiling_mount_pir_detector.asp

As for smoke alarms you are not meant to mount them within 300mm of anything that could affect the air circulation around it, although I have found this - don't know where you'd buy them from though

http://www.architecturaldevices.com/

 

[mgx]

Thanks guys, good replies. The property is a flat, with another above, and we don't plan to put a false ceiling in (in fact, removing one that is there), which negates any ceiling mounted options. Perhaps I just need to stick with small sensors (e.g. I was looking at texecom prestige compact).

 

[breezer]

pirs can nopt see through (most) solid objects

 

[securespark]

Also, smokes are supposed to be mounted on a ceiling fairly central, aren't they?