185mm Heavy-Duty Aluminum Foil Duct | Range Hood Exhaust Pipe

Heavy-Duty Aluminum Foil Range Hood Exhaust Pipe - Flame Retardant, Thickened for Kitchen Ventilation & Industrial Use.

Length 2m

A 185 mm diameter exhaust duct has a cross-sectional area of approximately 26,880 mm², while a 150 mm diameter duct has about 17,671 mm².

The 185 mm duct is therefore 9,209 mm² larger, which is approximately 52.1% more in cross-sectional area than the 150 mm duct.

How Does a 52.1% Increase in Duct Area (185 mm vs. 150 mm) Affect Airflow and Smoke Extraction?

1. Larger Cross-Section = Greater Ventilation Capacity

The larger the duct area, the more air (and smoke) it can carry per unit of time. This means:

• Higher airflow volume: A 185 mm duct can support a larger air volume (e.g., over 20 m³/min), suitable for high-powered range hoods.

• Smoother smoke extraction: Even at the same airspeed, more smoke is carried out, reducing backflow or leakage into the kitchen.

2. Lower Air Resistance = Lighter Load on the Motor

With a bigger cross-sectional area, air resistance is lower:

• For the same airflow, the motor runs with less effort, creating less noise and enjoying a longer lifespan.

• Overall system efficiency improves, and grease is less likely to accumulate in the duct.

3. Matches the Trend Toward High-End Range Hoods

Modern high-end Chinese range hoods are moving toward higher airflow and pressure (e.g., 23 m³/min, over 1000 Pa):

• These often recommend 180 mm or larger ducts, as smaller ducts can restrict airflow and reduce performance.

• So a 185 mm duct helps maximize the performance of powerful range hoods, especially in heavy-use kitchens.

4. Things to Consider During Installation

While a 185 mm duct has better performance, it comes with a few practical considerations:

• Wall openings need to be larger, which can be tricky for older kitchen renovations.

• Flexible hoses, check valves, and other accessories must match the size to avoid leaks or added resistance.