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 Sealing Across Del Aire
We seal ductwork in Del Aire homes where LAX flight paths drop ultrafine soot into HVAC systems that most South Bay neighborhoods never see. If your registers streak black within weeks of cleaning, your ducts are likely pulling contaminated air through gaps and torn flex runs rather than delivering filtered air to your rooms. Our Del Aire crews work from the Garrison Partners Los Angeles office and carry mastic, metal tape, and replacement flex duct sized for the 1940s-1950s tract homes that dominate this pocket. Call (361) 326-5060 for a free estimate. We’ll price the job in writing before any work starts, and every seal is covered by our 365-Day Done Right Promise.
Why Hollis Air Duct Cleaning Is Del Aire’s Preferred Duct Sealing Company
Hollis has been part of the Garrison Partners family since 2004. The Garrison Standard means we arrive inside the quoted window, put the price on paper before touching equipment, and leave the site clean. In Del Aire, that standard matters more than in most places because the soot problem here is relentless, and homeowners have learned to be skeptical of crews who clean without sealing, only to have the black streaks return by the next season.
Our technicians are background-checked and uniformed. You know who’s walking into your home before they arrive. Phones are answered by a live person 24 hours a day, seven days a week. No voicemail loops, no callback queues, no waiting until Monday when your filter is already black again.
We know the local housing stock. Del Aire’s compact grid of single-story stucco ranches on raised foundations means attic flex runs, under-floor returns, and crawl-space connections that newer neighborhoods don’t have. Our crews have sealed hundreds of these systems. They know where the tears happen, how the rodent traffic moves, and why a partial seal job on a Del Aire home is worse than no seal at all.
Roy Castellanos leads this operation, and his name is on every written guarantee we issue.
Air Duct Sealing in Del Aire
Air Duct Sealing in Del Aire means closing every gap, tear, and disconnected joint in your forced-air system so that filtered air reaches your rooms and unfiltered air stays out. Because Del Aire sits under LAX’s final approach, return plenums on the east side near the runways collect a gray-black jet-exhaust soot that reaccumulates within months, so duct sealing here has to pair fresh source removal with airtight sealing to slow that specific soot load. A typical Air Duct Sealing job in Del Aire runs $450 – $850 for a single-system home, depending on how much flex duct needs replacement versus spot sealing with mastic and metal tape.
What We Seal First
We start at the air handler plenum and work outward. The plenum connection, the main trunk seams, and the flex-to-register boots are the priority leaks in Del Aire homes because they pull the most unfiltered air. Our techs use a smoke pencil to find the gaps you can’t see, then seal with water-based mastic for rigid duct and UL-181 metal tape for flex connections. No duct tape. Duct tape fails in attics.
When Sealing Becomes Replacement
Old flex duct under Del Aire’s raised foundations often tears at the sag points where rodents have traveled or where decades of vibration have worn through the insulation jacket. When we find multiple tears or compressed runs, we replace the section with new insulated flex rather than patch over damage that will reopen. We tell you before we cut anything. The price changes only if you approve the scope change in writing.
Duct Sealing Services in Del Aire
Duct Sealing Services in Del Aire cover the full range of leak repair, from spot sealing of accessible joints to complete system resealing after source removal. We were called to a 1952 stucco ranch on the east side where every supply register was streaking black and the filter was loading up in weeks. Using a Rotobrush system under negative pressure, our tech sealed a torn flex run in the attic that was pulling dark soot from a nearby return before the HEPA filtration unit had cleared the air handler. After sealing and rebalancing the supply and return ducts, the homeowner finally got a break from the rinse-and-repeat cleaning cycle. Duct Sealing Services for a typical Del Aire home range from $450 for targeted sealing to $1,200 for full-system work with multiple flex replacements.
Source Removal Before Sealing
Sealing a system before true source removal just locks in the gray-black soot, so it keeps shedding from the supply and return ducts. Our Duct Sealing Services always include pre-seal cleaning when we find heavy soot loading. We use Nikro negative-air machines to maintain containment while the Rotobrush system scrubs the interior surfaces. Then we seal. The sequence matters.
Raised-Foundation Specifics
Del Aire’s raised foundations mean duct runs through crawl spaces that flood with dust from the dry marine layer and soot from the airport corridor. We seal the crawl-space penetrations where the duct passes through the subfloor, a detail many crews skip. Those gaps are direct paths for contaminated air to bypass your filter entirely.
What happens when you call
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A real person answersNo phone trees - you reach a local pro.
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You get an upfront price rangeHonest numbers before anyone is dispatched.
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A background-checked tech heads outLicensed & insured, dispatched right away.
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You approve before work beginsNothing starts until you say go.
Trusted Brands We Service in Del Aire
We stock parts and materials from Rotobrush, Nikro, and Guardsman for Del Aire jobs, which means most seal and replacement work finishes in a single visit. Rotobrush rotary systems handle the pre-seal source removal. Nikro negative-air machines keep the work contained so we don’t redistribute soot through your home while we’re sealing. Guardsman filtration products give us the right MERV-rated replacement filters for Del Aire’s particulate load, not generic hardware-store stock that loads too fast or lets too much through. If your system needs a component we don’t carry, our Los Angeles office sources it same-day. We don’t make you wait through another black-filter cycle.
Common Duct Sealing Problems We See in Del Aire Homes
- Old flex runs under raised floors and in attics tear, letting jet-exhaust soot bypass HEPA filtration and re-contaminate the air handler. The 1940s-1950s flex duct in Del Aire’s original tract homes has exceeded its design life. Vibration, rodent traffic, and decades of heat cycling have degraded the inner liner. We find longitudinal splits and crushed sag points on nearly every older home we inspect.
- Sealing a system before true source removal just locks in the gray-black soot, so it keeps shedding from the supply and return ducts. Homeowners who hire cleaning-only crews see the streaks return within weeks because the embedded soot was never removed. We clean first, seal second, and explain why the order matters.
- Del Aire’s dry marine-layer dust doesn’t mold, so homeowners mistake persistent soot loading for a cleaning problem instead of a leak. The black streaks around your registers aren’t mold. They’re unfiltered particulate being pulled through gaps in your ductwork and deposited where the air velocity drops. Sealing stops the streaks. Cleaning alone does not.
- Longer drives and open land mean more dust and pollen, but skipped MERV rating checks let the blower motor pull that debris straight through. We verify your filter housing can handle the MERV rating your soot load demands. A filter that loads too fast may be doing its job, or it may be undersized for the blower’s static pressure. We check both.
Pricing for Duct Sealing in Del Aire, CA
A typical Duct Sealing job in Del Aire runs $450 – $850 for spot sealing and minor flex repair on a single-system home. Full-system resealing with multiple flex replacements runs $850 – $1,200. Homes with additions, second systems, or extensive rodent damage can run higher, but we price every job in writing before work starts. The price does not move at the door.
What moves the number: how many linear feet of flex need replacement, whether the plenum itself has separated from the air handler, and how accessible the runs are in your attic or crawl space. Del Aire’s raised foundations generally give us good access, which keeps labor hours predictable. We don’t charge per vent. One flat price per system, agreed before we start.
Estimates are free. Call (361) 326-5060 to schedule.
We Also Serve Cities Near Del Aire
Our crews work throughout the region. We provide Duct Sealing to homeowners in Los Angeles, San Diego, San Jose, and San Francisco with the same written pricing and 365-Day Done Right Promise we bring to Del Aire. Scheduling and dispatch are coordinated from our Los Angeles office, and each market is served by locally assigned technicians who know the housing stock and climate conditions in their territory.
Serving Del Aire, CA - Our Local Coverage Area
We’re based in the Del Aire 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 About Duct Sealing in Del Aire
Every three to five years for cleaning, with sealing inspected at the same interval. The jet-exhaust soot loads filters faster here than in inland neighborhoods, so we recommend checking accessible flex runs annually for new tears. Call (361) 326-5060 and we’ll assess whether your system needs full service or just a filter upgrade.
They need inspection first. Original flex duct in Del Aire has typically exceeded its 25-year design life. We spot-seal minor gaps and replace sections with multiple tears or compressed insulation. We never patch over duct that will fail again within a year. The written scope shows exactly what we seal and what we replace before any work starts.
Your return plenum is likely pulling unfiltered air through gaps in the ductwork, mixing jet-exhaust soot with the air that should be passing through your filter. Sealing the return-side leaks forces all intake air through the filter media, which extends filter life and reduces the black streaks on your supply registers. We verify this with a smoke test during every estimate.
It will slow it dramatically by eliminating the bypass path that lets soot enter your system downstream of the filter. Sealing doesn’t change the outdoor air quality, but it ensures that the air reaching your blower has passed through your filtration system. Pair sealing with the right MERV-rated filter for your blower capacity, and the rinse-and-repeat cleaning cycle finally breaks.
We seal the air handler plenum, trunk seams, flex connections, and subfloor penetrations using mastic and UL-181 metal tape. For raised foundations, we pay special attention to crawl-space duct runs where gaps at the subfloor let outdoor dust and soot bypass filtration entirely. The work typically takes four to six hours for a single-system home, and we clean the site before we leave.
Written by Roy Castellanos, Owner at Hollis Air Duct Cleaning, serving Del Aire under The Garrison Standard since 2004.