If your fitting the Honeywell BDR91 to a back box you may well find that some back boxes will not allow the BDR91 to fit, some folks then fit a blank face-plate and drill it to allow cable entry to the BDR91, well after going through 5-different makes (MK, MB, LAP, Schneider Lisse... etc) I found these that allow the BDR91 to clip nicely into place: http://www.screwfix.com/p/british-ge...ack-of-5/81051
BDR91 Back Boxes
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