Final answer:
The 5 main components of a basic local exhaust system are a source of contamination, airflow direction and ventilation system, capture hood or snorkel, air cleaning device, and exhaust stack or duct. Maintaining negative pressure is essential to ensure effective capture and removal of contaminated air.
Step-by-step explanation:
The 5 main components of a basic local exhaust system are:
- Source of contamination or pollutant
- Airflow direction and ventilation system
- Capture hood or snorkel
- Air cleaning device
- Exhaust stack or duct
Maintaining negative pressure is essential because it ensures that contaminated air is effectively captured and removed from the area. Negative pressure prevents the spread of contaminants to other parts of the facility and helps maintain a safe and healthy working environment.