... Beats me,Ron, all I know is that the Fire Official from the town wants a "Red-Eye" up there,which is a rate of rise heat detector..in line with the other line voltage smokes throughout the house.He wants combo carbon monoxide/smokes in all common areas on each level of the house as well.I asked him whether he prefers ionization as opposed to photo-electric,and he said photo-electric type.I have a smoke in the basement,a combo in the 1st floor common area outside(within 10')of the bedrooms,and a smoke in each bedroom,of which there are 2.On the 2nd floor,I have a smoke at the top of the stairway landing,as well as a combo in the hall area between the 2 bedrooms,and one smoke in each bedroom.The attic with the furnace/blower has to get the "Red-Eye"..or heat detector.
Russ


.."if it ain't fixed,don't break it...call a Licensed Electrician"