A round mushroom-style external wall vent cap in 304 or 201 stainless steel. The domed head sheds rain and the sloped internal profile prevents water running back down the duct, while a built-in insect mesh keeps pests out. The flange has pre-drilled mounting holes so it fixes straight to the wall with screws and sealant.
In living rooms, bedrooms, kitchens, bathrooms and corridors, air terminals is rarely the whole system — it is one link in a chain. Getting it wrong shows up later as throw distance, draught complaints, air distribution balance and noise. The selection criteria that actually drive performance are effective open area, throw pattern and noise level, and those are the three things a buyer should confirm before placing an order.
A terminal is specified by throw, not by size. Throw is the distance at which the air jet has slowed to a defined residual velocity, and it determines whether the conditioned air reaches the occupied zone or drops out of the diffuser and creates a draught directly below it. Two terminals of the same nominal dimension can have very different throw characteristics depending on their blade geometry and effective open area. Selecting by duct diameter rather than by required throw is the single most common specification error at the terminal end of a system.
Almost every draught complaint in a residential ventilation system traces back to one of three causes: an oversized terminal running at low flow, a terminal mounted too close to an occupied position, or a system that has been balanced by closing dampers rather than by adjusting fan speed. The first two are design issues and cannot be corrected after the ceiling is closed without significant cost. The third is a commissioning issue and is entirely avoidable. Careful selection at design stage is the cheapest form of comfort insurance available.
Every 304/201 Stainless Steel External Wall Air Vent Cap we ship is produced on our own production line in Dezhou, Shandong, China. Because we control the tooling and the forming equipment directly, we can guarantee that the product you receive in container three is dimensionally identical to the sample you approved in the first order. That consistency is difficult to achieve when production is outsourced, and it is the single most common complaint we hear from buyers who have tried sourcing this category through intermediaries.
Our mould shop supports custom development for 304/201 Stainless Steel External Wall Air Vent Cap. If your project needs a non-standard size, a specific wall thickness, a particular colour or a branded face plate, we can build the tooling and run a trial batch for approval before committing to a full production run. Typical custom development takes two to four weeks from drawing approval to first article, depending on the complexity of the part.
Confirm the exact size or model you need against the specification table below. Where a project mixes sizes on one run, check that every transition is made with a matching reducer rather than by forcing parts together — the latter is the single most common cause of leakage and pressure loss on site.
The material and layer build-up determine how the product behaves over a 15–25 year service life. Read the construction column carefully: two products that look identical on a photograph can differ entirely in wall thickness, insulation layer and fire performance.
| Item | Specification |
|---|---|
| Available Sizes / Models | Ø75mm, Ø100mm, Ø110mm, Ø125mm, Ø150mm, Ø160mm, Ø200mm，Ø250mm，Ø300mm |
| Description | Round mushroom outdoor vent grille with built-in insect mesh; Rainproof sloped design prevents rainwater backflow; Flange with mounting holes for easy installation; Widely used for fresh air intake, exhaust ventilation on exterior walls |
| Material / Construction | 304/201 Stainless Steel |
Fits directly onto HDPE corrugated pipe and aluminium flexible duct. For a square profile use the square stainless steel wind cap; where no mesh is wanted choose the meshless stainless steel cap.
GUANDE manufactures 304/201 Stainless Steel External Wall Air Vent Cap at our factory in Dezhou, Shandong, China, and ships direct to HVAC contractors, distributors and project specifiers worldwide. Wholesale, OEM and ODM programmes are welcome. Because we manufacture this product in our own plant, we control the tooling, wall thickness, material grade and quality inspection at every stage — not just the final packing. That means we can produce non-standard sizes, custom colours and private-label versions against your drawings, and we can adjust a production run when a project specification changes. Tell us your target market and we will confirm packaging, labelling and documentation to suit it.
The products below are routinely specified alongside the item discussed in this guide. GUANDE manufactures the full range in our own plant for consolidated shipping:
Q: Does the cap prevent rainwater ingress?
A: Yes. The domed head and sloped internal profile are designed specifically to shed rain and stop backflow.
Q: Can it be used for both intake and exhaust?
A: Yes, it is a bidirectional terminal suitable for intake and exhaust positions.
Q: Is a low-profile version available?
A: Please discuss the required projection with our sales team when ordering.
The southeast corner of the private entrepreneurship park in Huadian Town, Qihui County, Dezhou City, Shandong Province