Rotobrush Duct Sealing & Repair Nationwide

Rotobrush Duct Sealing & Repair: The Fort Lauderdale Owner’s Guide

If you run a Rotobrush system in Fort Lauderdale, you’ll eventually face a worn seal, a damaged brush head, or leaking duct connections in your own home or a client’s property. We stock Rotobrush-compatible replacement parts and perform duct sealing and repair across Fort Lauderdale with installed pricing that typically runs $350 to $900 depending on system size and what’s failed. Most Rotobrush duct sealing and repair jobs in our area wrap up same day once we’re on site and the scope is confirmed.

Call (754) 354-3644

Here’s how it usually goes: you notice the Rotobrush unit isn’t pulling the same negative pressure it used to, or the brush head wobbles, or you see duct mastic cracking around supply plenums in a Fort Lauderdale attic where heat and humidity have done their work. The part is done. You need it matched to your machine and swapped without a week of downtime. That’s what this page is for.

Key Takeaways:

• We stock Rotobrush-compatible duct sealing and repair parts on the truck for most common failures.
• Installed pricing runs $350 to $900 for typical Fort Lauderdale residential and light commercial jobs.
• Every repair carries the 365-Day Done Right Promise in writing.
• Hollis Air Duct Fort Lauderdale is an independent service provider. We are not affiliated with Rotobrush International.
• Call (754) 354-3644 for a free estimate before any work starts.

Which Rotobrush Models This Applies To

Rotobrush rotary brush systems have been through several series changes over the years, and the sealing and repair parts are not always interchangeable across generations. The most common units we see in Fort Lauderdale homes and commercial buildings are the Rotobrush aiir series, the older R500 and R400 rotary brush systems, and the compact systems used for duct sealing work. Each series uses different brush head diameters, vacuum collar sizes, and sealing gasket configurations.

The compatibility gotcha most owners hit is this: a brush head from an older R500 will not seat properly on a newer aiir system, even though both are “Rotobrush.” The shaft diameter and locking collar differ. Before you order anything online, read the label plate on the motor housing. It shows the model, series letter, and sometimes the manufacture year. If the label is worn off, measure the brush shaft diameter with a caliper. That measurement plus the drum or hose size tells us exactly which part family matches.

For Rotobrush specifically, we recommend OEM Rotobrush parts when the failure is in a high-wear component like the brush head or the vacuum collar. Genuine Rotobrush parts are engineered to the machine’s RPM and torque range. Aftermarket equivalents exist for some gaskets and seals, and we’ll use a quality one when it’s honest to do so. But on brush head assemblies, we’ve seen aftermarket heads throw bristles early or run out of balance, and that costs more in the long run than the OEM part would have. For sealing work, mastic, tape, and aerosol sealant are not Rotobrush-specific, but the application method matters more than the brand on the bucket.

One Fort Lauderdale-specific note: our salt air and attic temperatures that regularly top 120°F in summer shorten the life of rubber vacuum collars and foam sealing gaskets noticeably. A collar that would last five years in a dry climate often stiffens and cracks in three here. We stock replacements knowing that timeline.

Signs Your Rotobrush Duct Sealing & Repair Is Failing

• Loss of suction at the vacuum collar. You can feel reduced pull at the hose end. Common cause: the rubber collar has hardened from repeated attic heat cycles and no longer seats around the duct opening. Left alone, the system pulls attic air instead of duct air, and the cleaning job suffers.
• Brush head wobble or loud vibration during rotation. This points to worn shaft bushings or an unbalanced brush head. Running the machine with a wobbling head accelerates bearing wear and can score the shaft, turning a $120 part replacement into a $400 repair.
• Visible mastic cracking at duct joints. In Fort Lauderdale attics, temperature swings between daytime heat and nighttime cool cause rigid mastic to crack over time. That means air leaks at plenum connections, supply runs, and return boots. The Rotobrush sealing attachment is only as good as the mastic or tape it applies.
• Inconsistent RPM during operation. The brush speed surges or drops without input. This usually traces to a failing drive coupling or a binding brush assembly. It is not a setting issue. The machine is telling you something.
• Debris bypassing the filter housing. If you see dust collecting around the vacuum collar or filter seal instead of in the collection bag, a gasket has failed. On Rotobrush aiir units, the filter housing gasket is a common first failure because it sits near the hottest part of the motor assembly.

Replacement Cost & What’s Included

In Fort Lauderdale, Rotobrush duct sealing and repair work on a typical 2,000 to 3,000 square foot home runs between $350 and $900 installed, including parts and labor. Smaller jobs, like replacing a single vacuum collar or a filter housing gasket, land at the low end. Full duct sealing of an entire system using mastic and tape applied with Rotobrush-compatible tools, plus brush head or bearing replacement on the machine, lands at the high end.

What drives the range: how many duct joints need re-sealing, whether we are repairing the Rotobrush machine itself or just the ductwork it services, and the accessibility of your attic or crawl space. Fort Lauderdale homes built before 1990 often have duct runs in tight, low-clearance attics, which takes longer to move through.

Here’s the arrangement every time:

• Written price before work starts. No surprises at the door.
• Parts and labor broken down plainly.
• 365-Day Done Right Promise on every repair. If it fails within a year, we come back at no charge. Including a free second visit. That is not a courtesy. It is written on the invoice.

We will always tell you if the part can be repaired rather than replaced. Sometimes a gasket reseat fixes the issue. Sometimes it does not. You get the straight answer either way.

DIY or Call Us?

You can safely check three things: the label plate for model numbers, the condition of the vacuum collar (look for visible cracks or stiffness), and whether duct mastic is peeling away from joints. That information helps us quote accurately over the phone.

What we do not recommend: attempting to replace a Rotobrush brush head or drive coupling yourself without the right puller tools and torque specs. The brush shaft spins at high RPM under load. A head seated incorrectly can throw off balance, damage the housing, or injure whoever is standing nearby. This is not a scare tactic. It’s the same reason we won’t sell you the part and wave goodbye. We install it, torque it correctly, test the RPM, and confirm the negative air holds before we leave.

If you’re in Fort Lauderdale and the machine is down or the ducts are leaking, call (754) 354-3644. We’ll quote the repair in writing and schedule a time that fits.

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