Any Fire alarm installers here

[ricky s]

Not a motoring question, but if there is a Fire alarm installer here, be good to hear their comments. I have an L1 installation, 130 heads, which includes 2 loft voids 1200mm x 800mm, currently fitted with optical smoke detectors, 1 to each void, both are gathering dust and triggering the system over a period of time, calling the Fire Brigade on such occasions, my question to which my commissioning people are not responding to currently, is if i swapped the optical smoke detectors out to ROR Heat detectors would the system still be L1 compliant. Appreciate any advise here,