AC Infinity stainless steel duct clamps, two per pack, in 100, 150, 200 and 250 mm. SAE grade 316 stainless with a rustproof gloss finish and a worm-drive lock that takes either a Phillips or a flat-head screwdriver. They are the fitting that holds the whole run together — ducting to fan, ducting to filter, ducting to silencer — and grade 316 is the reason they still turn a year into a warm, humid room.
Grade 316 is the specification to look for
Plated-steel clamps are cheaper and they rust, usually at the screw head, and usually at the moment you want to loosen them. SAE grade 316 stainless is the marine grade: it resists corrosion in humidity and condensation, which is exactly the environment inside a grow room or a bathroom extraction run. The gloss finish adds a second layer of protection.
Worm drive that keeps working
Each clamp is checked so the worm drive runs smoothly, does not jam partway, and does not slip once tensioned. The dual-type screw head takes a Phillips or a flat blade, so you are not hunting for a specific driver at the top of a ladder with a fan in one hand.
Specifications
| Manufacturer | AC Infinity Inc. |
| Product names | Duct Clamps, Two Pack |
| Models / UPC | AC-DCA4-2 · 819137020566 AC-DCA6-2 · 819137020573 AC-DCA8-2 · 819137020580 AC-DCA10-2 |
| Sizes | 4″ (10.2 cm) · 6″ (15.2 cm) · 8″ (20.3 cm) · 10″ (25.4 cm) |
| Material | Stainless steel, SAE grade 316 |
| Finish | Rustproof gloss |
| Lock | Worm drive, Phillips and flat head |
| Pieces per pack | 2 |
FAQ
Which size do I need?
Match the nominal duct size — a 150 mm duct takes the 6″ clamp. The clamp tightens over the ducting where it sits on the port, so it needs to close around the duct plus the port beneath it, which is what the sizing already allows for.
Do I need these if my ducting came with clamps?
Only for the extra joints. Each four-layer ducting pack includes two clamps, which covers one length. Adding a silencer or a damper mid-run adds two more joints, and each of those needs a clamp.
Will they rust in a humid room?
SAE grade 316 stainless is chosen for exactly that. It is the same grade used in marine fittings, and the gloss coating adds further protection at the screw head where plated clamps usually fail first.
Can I reuse them?
Yes. Loosen the worm drive, slide the clamp off and refit it. They are not a one-use fitting, which is another reason to buy stainless rather than the cheap plated type.
What about sealing the joint?
The clamp holds it; foil ducting tape seals it. On a filtered extraction run, taping the joints after clamping is worth the ten minutes.
Is this genuine AC Infinity stock with Australian warranty?
Yes. Quick Bloom Lights is the official Australian importer and distributor for AC Infinity. Stock is held in Sydney, orders ship domestically, and warranty is handled here rather than through an overseas seller.