Bus AC Louvers: Types, Sizes and How to Buy Wholesale (2026)

A bus AC louver is the vented grille that guides conditioned air into the passenger cabin — the visible, hard-wearing part of the cooling system that passengers touch every day. For fleets and distributors buying in volume, AC louvers are a steady re-stock SKU: they sit in high-traffic areas, weather daily wear, and are quick to replace. This guide covers the types, the materials, how to size them correctly, and what to check before you place a wholesale order.

The louver does three jobs at once: it distributes airflow evenly across the cabin, protects the duct outlet behind it, and still has to look tidy in a vehicle interior for years. A wrong-sized or brittle louver rattles, whistles at speed, or cracks around the fixing points under vibration. For a bus operator that means a small but constant maintenance nuisance; for a distributor it means warranty call-backs. Buying a properly specified unit avoids both.

Mounted in the head-lining, roof louvers direct cooled air down over the seat rows. They are usually a large, low-profile grille designed to spread airflow across the aisle and both sides. Roof units are the most common AC louver on city and coach buses and the highest-volume replacement part.

Side-wall louvers are smaller and feed ventilation into confined spaces such as luggage compartments or the space under long seat banks. They also appear on certain coach layouts to direct airflow along the wall. Their compact size makes them easy to stock, but material quality matters because they are exposed to luggage handling and moisture.

Some layouts use adjustable blades so the driver or service team can balance airflow across zones. These are less common than fixed louvers but are useful when cabin loading changes.

Material choice is the single biggest price and durability lever on a louver.

• ABS plastic — lightweight, low cost, consistent coloured finish, and immune to corrosion. This is the default for most standard roof and side louvers. Choose ABS when weight and price matter most and the unit sits in a protected interior zone.
• Aluminium — higher mechanical strength and a longer service life under impact or vibration. Aluminium louvers are a better fit for high-frequency routes and rugged applications, at a higher unit price.

Ask your supplier for the exact grade and wall thickness rather than just "ABS" or "aluminium" — the grade drives impact resistance and how well the louver holds its shape over time.

Fitting is about two things: the cut-out dimensions and the vehicle series.

• Material grade — ask for the actual ABS grade or aluminium alloy, not just the name.
• Finish and colour — confirm the surface texture and whether a paint colour match is needed.
• OE cross-reference — the supplier should map OE numbers to part numbers so you can order by vehicle.
• MOQ — for stock units this is often one carton or a small quantity per part number; made-to-order units need a higher batch.
• Packing — confirm the louver is edge-protected so grilles arrive undamaged in a mixed container.
• Sample first — order a sample to inspect fit, finish and material before committing to volume.

Guangzhou Newsong Auto Parts Co., Ltd. supplies interchange parts for bus, truck, car, EV and special vehicles, including the AC Louver category under Bus Parts. We support Chinese bus brands including Yutong, King Long, Golden Dragon, Higer, BLK, Zhongtong, Foton, Sunwin, Sunlong, CRRC and BYD, and we work with buyers on mixed containers that combine many part numbers in a single shipment. Send us your OE numbers or a photo of the unit and we will cross-reference the correct louver and quote within one business day.

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Send us your part list, OE numbers or a photo of the unit you need. We quote within one business day, propose the right container mix and handle the export documents.