Gas & appliance vent caps
Multi-layer caps for water heaters and furnaces, formed in one spinning sequence.
Roof Vent Caps & Plumbing Vents
Galvanised steel and aluminium vent caps formed to your profile — from catalogue sizes to private-label production for building-material brands.
Part of our metal spinning service: vent caps, air outlets and roof terminals are formed on the same lathes as our other custom parts.
Product range
Vent Caps We Manufacture
Roof-mount attic vents
Power ventilator housings and domes, painted or galvanised, with mounting flange.
Plumbing vent caps
Two-inch and three-inch DWV terminations with insect screen and locking collar.
Standard sizes & profiles
Catalogue profiles from Ø50 to Ø300 mm, ready for private-label packaging.
Materials
Materials and Corrosion Protection
A vent cap lives on the roof, which means UV, rain, freeze-thaw and — near the coast — salt. The material choice is the difference between a cap that lasts five winters and one that stains the shingle in year two.
| Material | Typical use | Protection |
|---|---|---|
| Galvanised steel (Z275) | Standard plumbing and gas vents | Zinc coat as formed; powder coat optional |
| Aluminium 1050 / 3003 | Coastal and coastal-air installations | Clear anodised or as-formed |
| Stainless 304 / 430 | Premium and marine environments | Passivated; no coating needed |
| Aluminised steel | High-temperature flue terminations | Mill finish |
Tell us the installation climate and the target price, and we will propose the grade rather than defaulting to the cheapest option that fails first.
Forming options
Profiles, Screens and Collars
- Single- and multi-layer domes: stacked profiles formed in one pass set on a machined mandrel
- Locking collars and spigots: spun or rolled to mate with standard DWV pipe sizes
- Insect and bird screens: stainless mesh inserted and clinched before packing
- Powder coating: any RAL, UV-stable polyester for dark roof colours
- Stamped brackets: mounting feet and straps produced in the same plant
If your cap must mate with a specific pipe system, send the pipe OD and tolerance. We tool the collar to the fit — a cap that 'almost' fits a PVB or AAV is the most common returns reason in this category.
Production
Volume Production and Export Packing
Vent caps are a volume product: pallets of hundreds, packed nested, wrapped and container-loaded. We batch-spin the domes, fit screens and collars at assembly stations, and stack directly onto export pallets so the parts are never re-touched between forming and packing.
For building-material brands we run private-label programmes: your carton artwork, barcodes, item numbers per size, and mixed-pallet loads that arrive warehouse-ready.
Typical programme: catalogue tooling 7–10 days, first production batch 3–4 weeks, repeat orders monthly against call-offs.
FAQ
Questions Buyers Ask Us
What material should I choose for a coastal installation?
Aluminium 1050 or 3003, clear-anodised, or stainless 304. Galvanised steel will dull and shed zinc oxide near salt air within a couple of years. If the budget is tight, galvanised with a polyester powder coat is a workable middle ground for inland-coastal sites.
Do you offer private-label or retail packaging?
Yes. We print your artwork on the carton, apply barcodes, and pack per-store counts. Most building-material customers order mixed pallets — several sizes, several colours — that go straight to the distribution centre without repacking.
What sizes can you produce?
Collar sizes from Ø50 mm (2 inch) to Ø300 mm (12 inch), dome diameters up to Ø500 mm. Standard DWV pipe sizes are already tooled; a new size usually needs 7–10 days of tooling.
Can you add insect screens or bird guards?
Yes — stainless mesh clinched into the collar during assembly. Specify mesh opening and wire diameter, or we will propose a standard that passes most municipal plumbing codes.
What is the minimum order and lead time?
Pilot batches from about 500 pieces per size. A first production run is typically 3–4 weeks including tooling; repeat orders ship in 2–3 weeks against a rolling forecast.
Keep reading
Related Capabilities
More guides: Stainless Steel Metal Spinning · Aluminium Spinning Reflectors · Spun Tank Heads & Dished Ends · Low-Volume Metal Spinning · Metal Spinning vs Stamping · CNC Machined Aluminium Enclosures · Spinning Design Guide · Spun Cones & Funnels · Spinning for Lighting · Spun Drain Pans & Ice Tubs
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Spun Air Outlets for Airports, Theatres and Rail Hubs
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