How Your Commercial Kitchen Ventilation System Works
Understanding your commercial kitchen ventilation
Your commercial kitchen ventilation system is a critical piece of equipment that protects your staff, customers, and business from fire hazards, smoke, and heat. Understanding how it works helps you maintain it properly and avoid costly breakdowns.
The Core Components
Exhaust Hood
The hood sits above your cooking equipment and captures smoke, steam, grease vapors, and heat. Proper sizing ensures complete capture of cooking emissions.
Grease Filters
Baffle or mesh filters sit inside the hood and trap grease particles before they enter the ductwork. Regular cleaning or replacement is essential.
Plenum
The plenum is the chamber behind the filters where air pressure equalizes before entering the ductwork. Grease accumulates here and requires thorough cleaning.
Grease Ductwork
Ducts carry grease-laden air from the hood to the rooftop exhaust fan. They must be properly sealed, pitched for drainage, and equipped with access panels every 12 feet.
Exhaust Fan
The rooftop exhaust fan pulls air through the entire system. It must be properly sized for your kitchen's airflow needs and hinged for cleaning access.
Makeup Air Unit
A makeup air unit (MAU) replaces the air exhausted from your kitchen with fresh, tempered air. This maintains proper air pressure and prevents backdrafts.
Fire Suppression System
Installed inside the hood, this UL 300-compliant system automatically detects dangerous temperatures and discharges fire-suppressing agents to contain grease fires.
Grease Containment
Rooftop grease containment systems capture grease expelled by the exhaust fan, preventing roof damage and environmental contamination.
The Airflow Path
Understanding how air moves through your system helps you identify problems early:
- 1 Cooking produces smoke, steam, and grease vapors
- 2 The exhaust hood captures these emissions
- 3 Grease filters trap large particles
- 4 Air enters the plenum and ductwork
- 5 The exhaust fan pulls air up and out through the roof
- 6 Makeup air replaces the exhausted air
Warning Signs Your System Needs Attention
- Visible grease buildup on hood surfaces or filters
- Smoke not being captured effectively
- Unusual fan noise (grinding, squealing, vibration)
- Grease dripping from ductwork or hood
- Failed fire or health inspection
- Strong cooking odors in dining areas
Regular Maintenance Keeps Your System Safe
NFPA 96 requires regular cleaning and inspection of your entire exhaust system. The frequency depends on your cooking volume — most restaurants need quarterly service. DDAN Hood Cleaning and Repair provides comprehensive maintenance to keep your system running safely and in compliance.
Don't Wait Until You're Fined or Shut Down!
Whether you need a one-time deep clean, an urgent emergency repair, or a complete kitchen exhaust system installation, DDAN Hood Cleaning and Repair is here to keep you up and running.
Call Now: (615) 881-6968
