Enquiry Centre - Addition / Alteration - Voluntary upgrade of existing fire alarm system. This FAS upgrade is limited to the replacement of the existing control unit with a new control unit without altering the existing wiring and outlet boxes. No proposed upgrade for the elevator automatic emergency recall. This permit has been issued based on item #3 of Bulletin 2006-004-BU/EL. Note: - The existing field devices incorporated in the fire alarm system shall be compatible with the new control unit in conformance with the CAN/ULC-S524. - OK for SIPS without drawings.