Final answer:
The certificate of fitness that an authorized service technician must possess to repair or replace defective equipment in homeless shelters immediately is a certificate of fitness for HVAC equipment. This certificate ensures the technician's expertise in maintaining and repairing heating, cooling, and ventilation systems.
Step-by-step explanation:
The type of certificate of fitness that an authorized service technician must possess to repair or replace defective equipment in homeless shelters immediately is a certificate of fitness for HVAC (Heating, Ventilation, and Air Conditioning) equipment.
This certificate ensures that the technician has the necessary knowledge and skills to safely work on the HVAC systems used in the shelters. It demonstrates their expertise in maintaining and repairing heating, cooling, and ventilation systems to ensure the comfort and safety of the homeless individuals.
Authorized service technicians with this certificate are trained to identify and address issues with the equipment efficiently and effectively, providing essential support to the smooth functioning of homeless shelters.