200mm PA66 Large Duct Brush

A 200mm PA66 Large Duct Brush is a round, large-diameter brush tool that uses PA66 nylon filament clusters secured in a stainless steel twisted-wire core, fitted to an 800 mm handle and extension interface with a quick-change coupling. It is designed for cleaning the interior surfaces of air-conditioning and ventilation systems: galvanized duct walls, plenums, mixing boxes, louver backs, filter tracks, and coil faces carrying light dust, lint, soot, or loose grease.

During use, the operator either pushes and pulls or rotates the brush by hand, or connects it through the quick-change coupling to a powered driver. The filament tips contact the surface at a slight angle and dislodge debris; negative air or vacuum capture usually removes the loosened material. The brush does not polish or scrape; it mechanically removes loose deposits. Use it on dry to damp HVAC surfaces, keep powered rotation moderate, and avoid excessive radial pressure on thin aluminum fins.

The dimensions and filament parameters in the table represent the standard 200mm PA66 Large Duct Brush. We adjust them to the project when the duct geometry or cleaning procedure requires a different configuration.

• Return and supply air duct interiors in galvanized and aluminum ductwork, where dust, lint, and pollen accumulate on the walls.
• Air handler plenums and mixing boxes, where the 200 mm head clears a wide section in a controlled number of passes.
• Ventilation louver and grille backsides, treating the interior face of large grilles from inside the duct.
• Evaporator and condenser coil faces with light soot, dust, or oily film, using light radial pressure and movement along the fin direction.
• Filter housing tracks and access-door frames where built-up lint blocks seating or airflow.
• Kitchen exhaust and range-hood duct pre-cleaning for loose grease film when combined with a suitable degreaser.

Match head diameter to the narrowest passage

For round duct, the 200 mm head needs clearance to pass connectors, dampers, and transitions. As a practical rule, choose a brush head at least 15 to 25 mm smaller than the narrowest accessible duct ID for straight runs, and more clearance for elbows or damper blades. For rectangular duct, use the clear opening, not the nominal size, and check the diagonal path through corners.

Choose filament stiffness from the surface and residue

PA66 filament diameter and trim length set working stiffness. A 0.5 mm filament with medium trim clears dust and lint from sheet metal. Choose 0.6 to 0.8 mm or shorter trim for heavier soot and caked dust. Choose 0.4 mm and longer trim for coil fins or coated surfaces. If the job needs aggressive removal from heavily contaminated or abrasive surfaces, consider an abrasive or wire-filled brush instead.

Set reach from the duct depth and extension method

The 800 mm handle covers the distance an operator can safely control. Add extension rods through the quick-change coupling for deep risers. Each extension shifts balance, so keep the total unsupported length within what the operator can guide without bowing the stem.

Decide hand or powered operation

Hand operation is enough for light dust and tight control. Low-speed powered rotation works for long straight runs. Keep RPM moderate, ensure the coupling is locked, and never let a long extension whip. High speed throws already-loosened debris and increases core fatigue.

Check the environment before committing

PA66 handles common HVAC service: damp surfaces, light detergents, oil-laden lint, and normal duct interior temperatures. If cleaning involves hot concentrated acids, strong alkaline immersion, or steam above PA66 practical limits, switch to a different filament material such as PBT, PP, or stainless wire.

We build this brush to the duct layout and cleaning procedure, not as a stock-only item. To define your configuration, provide the narrowest duct or opening size, duct section shape, accessible depth, surface material, residue type, cleaning chemical, expected cycle, and preferred drive or extension interface. A drawing or site photo helps us get the first sample right.

We can adjust the following:

• Filament: PA66 diameter from 0.3 to 1.0 mm, heat-set or straight, flagged tips, double-spiral or dense fill, trim length, and color.
• Head: diameter from about 150 to 300 mm or larger, head length from 300 to 600 mm, round or cylindrical profile, end tufts, and segmented or spiral fill.
• Core and stem: stainless steel twisted wire in 304 or 316, galvanized wire, or a polymer flexible core for metal-free or tight-radius applications.
• Handle: length, grip diameter, knurled, T-handle or loop handle, grip material, and hanging feature.
• Connection: quick-change coupling type and size, male or female end, thread or hex drive, and compatibility with your existing extension rods.
• Accessories: extension rods, spare heads, drive adapters, and multi-head cleaning kits.
• Packaging and marking: bulk carton, polybag, retail card, custom color, pad print, laser marking, and labeling.

If your project requires material declarations, batch inspection, third-party testing, or other acceptance documentation, we can arrange that support during the customization process.