Whole-system duct and dryer vent check with before-and-after photos - you see exactly what came out of your vents
That "$99 whole-house special" is a bait ad - the real number appears once they are in your hallway, or the "clean" is a shop-vac at the register. We photograph the inside of your ducts before and after instead.
Before
After
Before
After
Before
AfterFast, Reliable Duct Repair & Sealing Across Derby
Duct repair and sealing in Derby typically runs $340-$890 for most residential jobs, with written quotes delivered before any work starts. Our crews serve Derby from our Denver office, carrying the equipment and materials needed to handle the specific failure patterns this city’s mid-century housing stock produces. Call (720) 513-5159 for a free written estimate.
Derby’s dense blocks of 1950s and 1960s homes and apartments sit on the exposed northeastern edge of the metro, downwind of Commerce City’s industrial corridor. The sheet-metal trunk-and-branch systems installed to house that era’s workforce weren’t built for today’s HVAC loads, and they weren’t built to handle the petroleum-tinged dust that blows in on plains winds. We’ve been repairing and sealing Derby ductwork since 2013. We know what separates a real fix from a band-aid.
Why CleanRun Air Duct Cleaning Aurora Is Derby’s Preferred Duct Repair & Sealing Company
Our reputation in Derby was built on documentation, not slogans. Every job starts with a written price under Haven Standard Clause 1, and every duct run is photographed before and after. Customers in Derby receive their photo record as a standard deliverable, not an upsell. They can see the 1.5-inch separation in the trunk, the delaminated fiberglass duct board, the sealed joint after mastic application.
Technicians dispatched to Derby are background-checked and uniformed under Haven Standard Clause 3: Verified Crews. They’re identified by name before arrival, and they arrive with professional-grade equipment from Rotobrush, Nikro, and Guardsman, not hardware-store tools. The 365-Day Done Right Promise applies to every Derby job in writing, not as a verbal assurance that disappears with the truck.
Scheduling is coordinated from our Denver office, with crews carrying the specific materials Derby’s housing stock demands: mastic sealant rated for metal-to-fiberglass joints, replacement duct board for delaminated branches, and HEPA-contained negative-pressure extraction equipment sized for long hose runs when alley parking restricts truck placement.
Our Duct Repair & Sealing Services in Derby
Mastic Sealant Application
Mastic sealant is the thick, fiber-reinforced compound we brush onto metal duct seams and joints, then mesh-tape for structural reinforcement. In Derby, we apply it differently than in newer suburbs. The petroleum-tinged dark-gray dust cake that coats return plenums here contains fine particulates that can compromise conventional tape adhesives. We use mastic rated for contaminated substrates, applied after mechanical cleaning of the seam, so the seal holds against Derby’s specific particulate load. A typical mastic sealing job on a Derby ranch-style trunk system runs $340-$520.
Flex Duct Repair
Flex duct, the insulated flexible tubing that connects trunk lines to registers, deteriorates where Derby’s temperature swings and rodent pressure intersect. The arid climate embrittles the plastic liner; the exposed plains edge means more ground-level pest activity than in Denver’s urban core. We replace collapsed or torn flex with new R-6 or R-8 insulated runs, sealed at both ends with mechanical clamps and mastic, not zip ties. Most Derby flex duct repairs fall between $180-$340 per run, with full-system replacements quoted as a single written price.
Metal Duct Repair
Sheet-metal trunk lines in Derby’s 1950s-60s housing were often fabricated from 30-gauge galvanized steel, lighter than modern 26-gauge standards. The seams are spot-welded or drive-cleated, and after sixty-plus years of thermal cycling, they separate. We were called to a 1963 ranch off East 72nd Avenue where the homeowner reported a faint fuel smell every time the air handler kicked on; our tech ran camera inspection and found a 1.5-inch separation in the sheet-metal trunk just past the return plenum, leaking the petroleum-tinged dust cake straight into the supply and return ducts. We sealed it with mastic and mesh, re-insulated the fiberglass duct-board branches, and ran agitation tools under negative pressure with HEPA filtration at the air handler; the smell cleared and a blower-door test showed the return-side leakage dropped well below NADCA standards. Metal repairs in Derby typically range $420-$780 depending on access and extent.
Duct Insulation Replacement
The fiberglass duct-board branches in Derby’s original housing delaminate internally, shedding fibers that coat the blower motor and register faces. Sealing over them without replacing the degraded board traps moisture and makes the shedding worse. Our approach: photograph the delamination, quote replacement in writing, then install new duct board or transition to metal flex with proper insulation. Insulation work in Derby runs $280-$640 per branch, with whole-system quotes available.
Air Leak Repair
Air leak repair in Derby addresses a specific hazard that doesn’t exist ten miles south. Leaking return ducts in this city pull the petroleum-tinged dust cake directly from the return plenum into the living space, not just conditioned air from the attic or crawl. We pressurize the system, locate leaks with smoke pencil and thermal imaging, then seal each point with appropriate materials. Return-side leak repair in Derby homes typically costs $380-$650.
What happens when you call
- 1
A real person answersNo phone trees - you reach a local pro.
- 2
You get an upfront price rangeHonest numbers before anyone is dispatched.
- 3
A background-checked tech heads outLicensed & insured, dispatched right away.
- 4
You approve before work beginsNothing starts until you say go.
BeforeAfterTrusted Brands We Service in Derby
Our trucks carry professional-grade equipment from Rotobrush, Nikro, and Guardsman, the same brands specified in commercial HVAC contracts. We stock mastic sealant, fiberglass duct board, and flex duct in common Derby diameters so we’re not ordering parts while your system sits open. For Derby customers, this means the job quoted is the job completed, not a multi-day project waiting on supplier delivery. Equipment is maintained to manufacturer specifications and logged before each dispatch.
Common Duct Repair & Sealing Problems We See in Derby Homes
- Shared dryer-vent stacks in Derby’s dense mid-century apartment and condo buildings clog at the common run above the lint trap, not at the trap itself. Individual units report “long dry times” while the real blockage sits in the shared chase behind a locked utility wall. We access these stacks with proper building coordination and clear the full run, not just the accessible portion.
- Fiberglass duct-board branches in original 1950s-60s Derby housing delaminate internally, shedding fibers that coat the blower motor and register faces. The camera shows it clearly. Sealing over them without replacing the degraded board traps moisture and accelerates the failure.
- Restricted alley and street parking in Derby’s dense blocks forces crews to run long hose runs from the truck, and the resulting lower negative pressure lets refinery-and-plains dust escape containment and settle in the living space during repair work. We compensate with HEPA portable units and sealed work zones, documented in the photo record.
- Sheet-metal trunk seams separate after decades of thermal cycling, especially where Derby’s temperature swings exceed 40 degrees between summer day and night. The separation pulls unfiltered air from the return plenum, carrying that distinctive petroleum-tinged dust into supply ducts.
Pricing for Duct Repair & Sealing in Derby, CO
| Service | Typical Range in Derby |
|---|---|
| Mastic sealant (trunk seams, 1-2 joints) | $340-$520 |
| Flex duct repair/replacement (per run) | $180-$340 |
| Metal duct repair (trunk separation, sealed) | $420-$780 |
| Duct insulation replacement (per branch) | $280-$640 |
| Air leak repair (return-side, full diagnosis) | $380-$650 |
| Whole-system sealing with photo documentation | $680-$1,240 |
These are actual Derby market ranges, not teaser figures. Every quote is written and agreed before work starts, under Haven Standard Clause 1. No per-vent pricing. No $79 coupon that becomes a $900 invoice. The price we write is the price you pay. Free estimates are available at (720) 513-5159, and we offer a Free Second Opinion on any competitor’s written estimate.
We Also Serve Cities Near Derby
Our Duct Repair & Sealing crews work throughout the metro, including Derby, Aurora, Denver, Centennial, and Stonegate. Scheduling and dispatch are coordinated from our Denver office. Each city receives the same written-price guarantee, documented photo record, and 365-Day Done Right Promise.
Serving Derby, CO - Our Local Coverage Area
We’re based in the Derby area and know this community well. Use the map below to see our service coverage - if you’re nearby, we can almost certainly help.
FAQs - Duct Repair & Sealing in Derby
The blockage is almost certainly in the shared stack above the lint trap, not in the trap itself. Derby’s dense mid-century apartment buildings run common dryer-vent chases through locked utility walls, and lint accumulates at the horizontal transition or roof cap where individual runs merge. We coordinate with building management to access the full stack, clear the blockage, and document the before-and-after flow rate. Call (720) 513-5159 for a free estimate.
It’s a mixture of Commerce City refinery particulates and Eastern Plains agricultural dust, unique to Derby’s downwind position. This dust is finer and more adhesive than standard household dust, and it indicates that your return ducts are pulling unfiltered air from a leak point. Standard cleaning won’t stop it from returning; we need to seal the return-side leaks with mastic rated for contaminated substrates, then verify with a blower-door test. The repair protocol differs from standard dust remediation because the source is exterior pollution, not interior accumulation.
They need to be replaced if the interior surface is delaminating, which our camera inspection will show clearly. Sealing over degraded duct board traps moisture and accelerates fiber shedding into your supply air. We photograph the delamination, quote replacement in writing, and install new duct board or transition to insulated flex. The 365-Day Done Right Promise covers the installation.
Yes. Restricted alley and street parking often requires longer hose runs from the truck, which reduces negative pressure at the tool head. We compensate with HEPA portable containment units and sealed work zones around each access point. We coordinate with building management for utility room access and schedule around tenant parking patterns when possible. These logistics are built into every Derby apartment quote.
Derby homes need inspection every 3-4 years, more frequently than the 5-7 year interval typical for sheltered Denver neighborhoods. The combination of refinery particulates, plains dust, and original 1950s-60s ductwork creates faster deterioration of seals and insulation. We recommend a camera inspection to establish baseline condition, then scheduled monitoring based on what we find. Call (720) 513-5159 to schedule.
Ready for a written quote? Call CleanRun Air Duct Cleaning Aurora at (720) 513-5159. We’ll send a technician with a camera, a pressure gauge, and a price book. You’ll get a written scope, a documented photo record, and the 365-Day Done Right Promise, all under the H.A.V.E.N. Standard. No call-for-pricing. No per-vent games. Just documented work you can verify.
Written by Tomas Reyes, Owner at CleanRun Air Duct Cleaning Aurora, serving Derby since 2013.