A Grade D1 system is required for:
- New or materially altered dwellings, up to three storeys with no floor exceeding 200 m2.
- Existing dwellings with poor or inadequate fire protection, up to three storeys with no floor exceeding 200 m2.
- Individual dwelling units of two or more rooms in Houses in Multiple Occupation (HMOs) of one or two-storeys, with no floor exceeding 200 m2.
There are three Levels of Detection (LD). Generally the greater the fire risk the more comprehensive the system should be.
LD1 = Maximum Protection. Alarms in all circulation spaces that form part of escape routes and all areas where a fire might start.
LD2 = Medium Protection. All circulation spaces and escape routes (e.g.hallways and landings) are covered together with a provision of higher fire risk areas (e.g.kitchen and living rooms).
LD3 = Minimum Protection. Alarms in all circulation spaces that form part of escape routes.
* Ensure that a Grade D1 system is adequate for the dwelling you are installing the alarms in. You can obtain further information from your local fire service or building control department at your local council offices.
