Duct Spinners for Kitchen Exhaust and Vent Cleaning

Hood cleaning crews make their money in the duct, and a duct spinner is what gets the vertical runs clean without a man hanging in them. We carry Mosmatic TYR duct spinners, hooks, and duct wagons, with the popular sizes in stock in Gaithersburg. Building out a hood rig or quoting your first NFPA 96 contract? Call 301-519-9274 and we will spec the whole setup with you.

Picking a Duct Spinner That Matches the Work

A duct spinner is a rotating head with spray arms that throw high pressure water 360 degrees against the duct wall. Water pressure alone spins it, no motor and no electronics. The Mosmatic TYR line that we stock is rated to 4,000 PSI and 250 degrees F with a 3/8" FPT inlet, so it runs on a standard hot water skid. Hot water matters here. Grease that laughs at a cold rinse wipes out when it hits 200 degree water under pressure.

Fixed or adjustable arms

Fixed spinners are built for one duct diameter and put the nozzles at the ideal standoff for that size. If your accounts are mostly the same duct, a fixed head like the 16 inch is the simple, durable pick. Adjustable spinners let you swing the arms in and out to cover a range of diameters with one tool. Contractors who see a different duct every week buy the adjustable and stop carrying three heads up the ladder.

Nozzles are sold separately

TYR heads take standard 1/8" thread spray nozzles on the arm tips, and Mosmatic recommends 15 degree tips for duct work. Size the orifices to your machine's GPM the same way you would size a surface cleaner, splitting total flow across the number of nozzles. Grab them from our 1/8" MEG nozzle wall when you order the head so the tool works the day it arrives.

Hooks for vertical, wagons for horizontal

On a vertical grease duct you work from the fan opening on the roof. The duct cleaner hook clips to the spinner so you can lower it on a cable or rope and pull it up slowly while it spins, top to bottom, in controlled passes. On long horizontal runs the spinner rides in a stainless duct wagon, a wheeled cradle that keeps the head centered while you pull it through with a rope from the far access panel. Trying to drag a bare spinner down a horizontal duct scratches the head, snags on seams, and cleans off-center.

Duct Cleaning Lineup

Spinners, wagons, and hooks are stocked. Call ahead on the adjustable duct cleaner and specialty heads and we will confirm availability that day.

From the Field

The mistake we see most from new hood cleaners is buying the spinner and skipping the wagon and hook, then improvising with rope and duct tape on the first job. The head bounces, one side of the duct stays dirty, and the after photos show it. Budget the full system up front. It is the difference between a certification sticker you can stand behind and a callback. Second mistake: running the spinner dry while setting up on the roof. These heads are water lubricated. Spin one on air for a minute and the bearing pays for it. Pressurize only when the head is in the duct.

Related Collections

• Kitchen Exhaust Cleaners
• Duct Cleaners
• All Mosmatic Equipment
• Rotating Nozzles
• 1/8" MEG Nozzles
• Degreasers
• Hot Water Pressure Washers
• Whip Lines
• Sewer Jetter Nozzles

Hood cleaning around the DC metro area? Our Gaithersburg counter keeps duct gear on hand so a broken head does not cost you a night job.

Frequently Asked Questions

What size duct spinner should I buy?

Match the head to your duct diameter. Fixed heads come in set sizes and the adjustable TYR covers a range by swinging its arms in or out. If your route has mixed duct sizes, the adjustable is the one tool answer.

Do Mosmatic duct spinners include spray nozzles?

No. The arm tips take standard 1/8" thread nozzles, with 15 degree tips the usual pick for duct walls. Size the orifices to your machine's flow split across the nozzle count, and order them with the head.

Can I run a duct spinner on my hot water machine?

Yes, and you should. The TYR line handles 4,000 PSI and up to 250 degrees F. Heat is what moves baked-on grease in a kitchen exhaust duct, so a hot water skid turns an hour of scraping into minutes of rinsing.

How do you clean a vertical grease duct with a spinner?

From the roof, with the fan pulled. Attach the hook, lower the spinning head down the duct on a cable, then raise it in slow, even passes. Gravity carries the grease down to the hood area, where the runoff gets collected.

What is the duct wagon for?

Horizontal runs. The stainless wagon cradles the spinner on wheels so it stays centered while you pull it through the duct with a rope. Without it the head drags the bottom of the duct and cleans unevenly.

Why did my duct spinner stop rotating?

Usually a plugged nozzle throwing off the balance, or a worn swivel from running the head dry. Clear the tips first. If the bearing is rough, send it in for service before it seizes mid-job.