Air-Aspirating Foam Nozzle

1.1 Foam Solution Delivery: A pre-mixed foam solution (water + foam concentrate) is supplied via a fire hose connected to the nozzle.

1.2 Air Aspiration: As the solution flows through the venturi, it creates suction, drawing in ambient air through intake ports.

1.3 Foam Generation: Air and foam solution combine in the mixing chamber, producing low- to medium-expansion foam (5:1 to 200:1 expansion ratio).

1.4 Foam Application: The expanded foam is discharged as a cohesive blanket to smother flames and suppress flammable vapors.

2.1 High-Quality Foam Generation

Produces stable, uniform foam with small, tightly packed bubbles, ensuring optimal coverage and adhesion to fuel surfaces.

Achieves expansion ratios of 8:1 to 20:1 (low-expansion) for direct fire attack or 50:1 to 200:1 (medium-expansion) for vapor sealing.

2.2 Portability and Flexibility

Lightweight design (typically 2–5 kg / 4.4–11 lbs) enables rapid deployment in confined spaces or mobile firefighting scenarios.

2.3 Fuel-Specific Suppression

Hydrocarbon Fires: Aqueous Film-Forming Foam (AFFF) creates a vapor-sealing aqueous film.

Polar Solvent Fires: Alcohol-Resistant AFFF (AR-AFFF) forms a polymeric membrane resistant to fuel dissolution.

2.4 Reduced Foam Concentrate Consumption

Efficient air aspiration minimizes foam concentrate usage while maximizing foam volume (e.g., 3% AFFF at 200 L/min generates 6,000–40,000 L of foam).

2.5 Durability and Safety

Rugged construction withstands high-pressure (up to 12 bar / 175 psi) and extreme temperatures (–20°C to 60°C).

Heat-resistant handles protect users from thermal feedback during close-range firefighting.

 

How to Use a Handheld Air-Aspirating Foam Nozzle

3.1 Pre-Operation Setup

System Connection:1. Attach the nozzle to a fire hose supplied by a foam proportioning system (e.g., inline inductor, CAFS). 2. Confirm the foam concentrate type and mixing ratio (e.g., 1%, 3%, or 6%).

Pressure Calibration:1.Adjust the water supply pressure to meet the nozzle's operating range (typically 4–10 bar / 60–145 psi).2. Refer to the nozzle's performance chart for flow rates (e.g., 100–600 L/min).

3.2 Operational Techniques

Foam Application Modes: 1.Roll-On Method: Direct the foam stream at the base of the fire, allowing the blanket to spread across the fuel surface.2.Raindown Method: Apply foam from above to gently cover the fire without disturbing the fuel (ideal for spills).3.Bank-In Method: Bounce foam off a wall or object to indirectly coat the fire (useful in obstructed spaces).

Distance and Angle:1. Maintain a 3–5 meter (10–16 ft) distance for optimal foam coverage.2.Hold the nozzle at a 30°–45° angle to maximize foam adhesion.

Switching Modes:Use the selector ring to switch between foam and water-only modes for cooling adjacent structures.

3.3 Post-Operation Maintenance

Rinse Thoroughly: Flush the nozzle with clean water to remove foam residue and prevent clogging.

Inspect for Damage: Check air inlet ports for debris and ensure the venturi tube is unobstructed.

Storage: Store in a dry, ventilated area to prevent corrosion or rubber component degradation.

 

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