Kitchen Exhaust Hood Balancing

Restaurant ventilation

Commercial Kitchen Hood Pressure Calibration

Commercial restaurant kitchens operate high-volume exhaust hoods that remove grease, heat, and combustion products. If the exhaust fan speed is not properly balanced with the makeup air supply unit, the kitchen can experience severe pressure problems. This can pull cooled air out of the dining room or allow kitchen smoke to enter seating areas. Precision Air Balancers L.L.C. provides certified kitchen hood balancing services to help restaurants establish healthy environments.

We adjust exhaust fan outputs and makeup air fan rates to establish a minor negative pressure envelope in the kitchen area. We check hood capture velocities using hot-wire anemometers, ensuring compliance with local fire safety codes and NFPA 96 criteria. This balancing helps prevent grease buildup in ducts, keeping the system safe and efficient.

Unbalanced kitchen ventilation is a common cause of draft problems, smoke leakage, and high utility bills in dining establishments. If makeup air is insufficient, the exhaust fans will draw air from the dining room, causing doors to stick and drafty zones to form. We use digital anemometers to measure capture velocities and adjust fan pulleys. This calibration keeps dining spaces comfortable and helps restaurants secure local municipal code clearance.

We work closely with restaurant owners and mechanical contractors during the installation and certification phases. Our technicians isolate the exhaust and supply units, calibrate air distribution registers, and record final air volume metrics. We provide detailed reports verifying that kitchen systems conform to design requirements. Learn about our commercial air balancing or review our mechanical commissioning services.

NFPA 96 Code Compliance Auditing

We check commercial kitchen exhaust systems against NFPA 96 fire safety codes and local mechanical regulations. We measure the actual volume of exhaust air, verify that grease filters are set correctly, and check interlock controls that link the hood to the makeup air unit. Our reports help restaurant owners confirm that the systems exhaust air at correct velocities to prevent fire hazards, avoiding regulatory fines.

Makeup Air System Adjustments

Exhausting high volumes of air without introducing makeup air creates severe negative pressure. We measure air intake rates on makeup air units, verify that heating and cooling elements function, and adjust fan pulley speeds. This balancing ensures that the kitchen has correct makeup air volumes, preventing backdrafting from water heaters and preserving dining area comfort.

Grease Containment and Exhaust Duct Velocity Requirements

Grease exhaust systems must maintain air velocities between 1,500 and 2,500 feet per minute (FPM) inside vertical and horizontal exhaust ducts. If duct velocity falls below 1,500 FPM, grease particles drop out of the air stream and accumulate on duct walls, creating a serious fire hazard. If velocity exceeds 2,500 FPM, static pressure increases, raising fan energy costs and causing grease filters to vibrate.

Our technicians perform velocity traverses inside exhaust ducts using high-temperature pitot tubes to verify correct airflow rates. We check that grease filters are set correctly to capture grease particles before they enter the fan, and adjust pulley configurations on exhaust fans to maintain target velocities. This balancing ensures grease exhaust systems operate safely and comply with regional fire codes.

Grease Duct Clearances and Fire Protection Insulation Systems

NFPA 96 codes mandate strict clearances between grease ducts and combustible building materials. Grease ducts operate at high temperatures and can experience interior fires. We verify that grease exhaust ductwork maintains required clearances or uses certified fire-rated insulation wraps. This inspection helps restaurant owners ensure their ventilation system is safe, protecting the property from kitchen fire hazards.