Fast, Reliable Duct Repair & Sealing Across Van Nuys
Most duct repair and sealing jobs in Van Nuys run $180-$650 depending on whether we’re sealing accessible joints or replacing collapsed flex runs in a 140°F attic, and our Duct Repair & Sealing crew can usually be there same day or next. We know the Valley. We’ve been driving Nordhoff Street and Roscoe Boulevard since 1984, pulling trucks into driveways from Panorama City to North Hills East, and we understand what Van Nuys attics do to ductwork that coastal LA never sees. Call (844) 685-6342 - a live person answers, 24 hours a day.
Why Bellows Air Duct & Vent Co. Is Van Nuys’s Preferred Duct Repair & Sealing Company
Ray Castillo built this company on the idea that a homeowner should never have to call twice for the same problem. That was true in 1984, and it’s how we still operate across Van Nuys ZIP codes 91408, 91409, 91410, and 91411. Our technicians are background-checked, uniformed, and equipped with Rotobrush-certified gear - not day-laborers with a shop vac.
We answer our own phones. No app. No voicemail maze. A real person at our office, day or night.
Our 90-Day Done Right Promise is stamped on every job. If the seal doesn’t hold, if the airflow doesn’t test right, we return at no charge. No paperwork to file, no argument to win. We stand behind it because we’ve stood behind it for over 42 years.
Van Nuys homeowners call us after they’ve been burned by the coupon bait-and-switch operators - the ones who quote $89 on the phone and present a $900 invoice at the door. Our pricing is disclosed before a single tool is lifted. The number on the phone is the number on the invoice.
Our Duct Repair & Sealing Services in Van Nuys
Duct Sealing
In Van Nuys, duct sealing isn’t a luxury - it’s a necessity forced by geography. The San Fernando Valley heat basin, combined with general aviation traffic from Van Nuys Airport (KVNY), accelerates duct mastic degradation and loads airborne particulates into systems that already run five or more months straight. We seal metal trunk lines with high-temperature-rated mastic rated for attic conditions that routinely exceed 140°F. Every joint is brush-applied, not sprayed and hoped-for. We camera-inspect before and after, so you see the seal, not just hear about it.
Flex Duct Repair
The post-WWII ranch homes that dominate Van Nuys and nearby Panorama City were built with shallow, poorly ventilated attics. That heat cooks flex-duct jacketing. We’ve replaced collapsed flex runs in homes near Strathern Playground where the original duct had literally sagged onto ceiling drywall, pulling attic dust and rodent debris straight into the supply stream. We install new insulated flex with proper support straps and sealed collars - not a patch, a proper repair that holds up to the next Valley summer.
Metal Duct Repair
Original sheet-metal trunk lines from the 1950s-1970s don’t need replacement as often as the discount guys claim. They need proper sealing. At a 1950s ranch home near Strathern Playground, our crew pulled a hot-water-heated metal duct trunk that had joint separations pulling in attic dust. We sealed all joints with Rotobrush-certified mastic, replaced a collapsed flex-duct run with new insulated flex, and tested airflow - a job that cut the homeowner’s cooling costs by 15% that August. Metal ducts, done right, outlast the house.
Duct Insulation
When we’re already in a Van Nuys attic repairing ductwork, we evaluate insulation condition. R-6 or R-8 flex with degraded jacketing loses thermal efficiency fast in 140°F ambient temperatures. Re-insulating supply lines prevents the 10-15% cooling loss we commonly measure in uninsulated or poorly insulated duct runs. It’s not always needed, but when it is, we price it upfront as part of the same visit.
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.
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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 Van Nuys
We carry Nikro negative-air equipment and Honeywell media filters on every Van Nuys truck, and we stock Aprilaire humidifier and air-cleaner components for same-day installation when duct modifications require them. Our mastic sealants and mechanical fasteners come from Abatement Technologies - the same supplies serious commercial HVAC contractors specify. That means no waiting on parts while your attic bakes another week. Most Van Nuys jobs are completed in a single visit because our trucks are loaded for what Valley attics actually demand.
Common Duct Repair & Sealing Problems We See in Van Nuys Homes
- Flex-duct jacketing failure from extreme attic heat. Van Nuys attics routinely hit 140°F+, and that heat degrades flex-duct jacketing and mastic adhesives years before their rated lifespan. We find joint separations that pull in attic dust, rodent droppings, and fiberglass insulation directly into the supply air - a problem coastal LA simply doesn’t see at this frequency.
- Return-side particulate loading from Santa Ana wind events. The exposed LA River channel and sandy flats around the Sepulveda Dam Recreation Area generate fine alluvial dust that Santa Ana winds drive straight into return-air grilles. We regularly clean return trunks in Van Nuys homes that are packed with material technicians describe as among the heaviest in Los Angeles County.
- Cross-unit contamination in older apartment complexes. In Panorama City and North Hills East, Cold War-era workforce housing complexes have shared horizontal duct runs through unconditioned attic cavities. One compromised trunk line can push debris into a dozen units. These buildings need full-system negative-pressure cleaning and proper isolation - not a cursory brush-and-blow that ignores the shared infrastructure.
- General aviation particulate infiltration. Van Nuys Airport traffic contributes to the Valley floor’s pooled pollutant load, and during temperature inversions, that smog gets cycled through residential HVAC intakes continuously. Sealed duct systems with proper filtration are the difference between filtering that load and circulating it through every room.
Pricing for Duct Repair & Sealing in Van Nuys, CA
We’re straightforward about numbers because we’ve seen what the alternative does to trust.
| Service | Typical Range in Van Nuys |
|---|---|
| Metal duct joint sealing (accessible trunk) | $180 - $340 |
| Flex duct section replacement (single run) | $220 - $450 |
| Full duct system sealing with mastic (avg. home) | $450 - $850 |
| Duct insulation wrap/replacement (per run) | $150 - $280 |
| Return trunk cleaning and resealing | $280 - $520 |
What moves the needle: attic accessibility (shallow Van Nuys ranch attics take longer), extent of contamination, whether we need to cut access panels in drywall, and if shared apartment systems require isolation work. We inspect with a camera before quoting - no guesswork, no bait. Every repair over $250 qualifies for our $50-off standing offer. Seniors and veterans receive a permanent 5% discount. And if you have a written estimate from another company, we’ll give you a free second opinion.
Call (844) 685-6342 for an exact quote - estimates are free, and the price we state is the price on the invoice.
We Also Serve Cities Near Van Nuys
Our trucks run regular routes to Van Nuys and the surrounding communities - Valley Glen, Sherman Oaks, Valley Village, and Encino. The same technicians, same equipment, same upfront pricing. Whether you’re in a 1960s Encino hillside home with custom metalwork or a Valley Glen bungalow with original flex duct, we know the local housing stock and what it demands.
Serving Van Nuys, CA - Our Local Coverage Area
We’re based in the Van Nuys 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 Van Nuys
General aviation traffic from Van Nuys Airport (KVNY) contributes to elevated particulate levels in the San Fernando Valley basin, and during temperature inversions, those pollutants pool at the Valley floor and get drawn into residential HVAC intakes. If your ducts have unsealed joints or degraded mastic, that particulate load bypasses your filter and circulates through every room. We seal systems to maintain negative pressure integrity so your filtration actually does its job. Call (844) 685-6342 if you’re noticing more dust than usual - we’ll camera-inspect and show you exactly where the breach is.
Yes - original sheet-metal trunk lines from the 1950s-1970s are often thicker-gauge and more durable than modern equivalents, and they respond excellently to proper mastic sealing. The issue isn’t the metal; it’s the original sealant, which has dried and cracked after 50+ summers in 140°F Van Nuys attics. We remove old material, clean the joints, and apply high-temperature-rated mastic rated for Valley conditions. Done right, those ducts will outlast new flex installations. Call (844) 685-6342 for a camera inspection and upfront quote.
High-temperature-rated brush-applied mastic, not tape, not spray foam, not hardware-store duct tape that turns to powder in two summers. Van Nuys attic conditions destroy standard mastic in 3-5 years. We use Rotobrush-certified sealants rated for continuous exposure above 140°F, applied to clean, mechanically secured joints. Every seal is camera-verified before we close the access. Call (844) 685-6342 - we’ll show you the before-and-after on our monitor before you pay anything.
Sealing alone won’t stop wildfire smoke, but an intact duct system prevents your HVAC from becoming a distribution network for particulates that infiltrate through leaks. In Van Nuys, where smoke from the Santa Susana and Verdugo hills pools during autumn fire season, we combine duct sealing with upgraded filtration - Honeywell media filters or Aprilaire electronic air cleaners - so your system filters what it draws in rather than circulating unfiltered attic and outdoor air. Call (844) 685-6342 to discuss filtration upgrades with your sealing job.
Yes, but it requires full-system assessment, not a spot fix. Those shared horizontal trunk lines in older Panorama City and North Hills East complexes traverse multiple units through unconditioned attic cavities, and sealing one branch without addressing the main trunk is temporary at best. We use negative-pressure containment and temporary isolation dampers to work on your section without contaminating neighbors, then pressure-test the full system. It’s more involved than a single-family home, and we price it upfront after camera inspection. Call (844) 685-6342 - we handle these buildings regularly and understand the constraints.
Written by Ray Castillo, Owner at Bellows Air Duct & Vent Co., serving Van Nuys since 1984.