Fast, Reliable Duct Repair & Sealing Across Lents
Duct repair and sealing in Lents, OR typically costs $280-$650 for most homes, and our Duct Repair & Sealing team can usually diagnose and quote the job same day. If you’re noticing weak airflow, musty odors that keep coming back, or your energy bills climbing without explanation, the problem often starts in your crawl space, not your furnace.
We’ve been driving out to Lents since 1984, and we know the neighborhood’s roads well - from SE Foster down to the Johnson Creek corridor, up through the residential streets near SE 92nd and Harold. Most calls from the 97266 ZIP code reach us within 35 minutes during business hours. When you call (844) 685-6342, a live person answers, day or night. We’ll give you an honest price before we lift a single tool, and we back every job with our 90-Day Done Right Promise in writing.
Why Bellows Air Duct & Vent Co. Is Lents’s Preferred Duct Repair & Sealing Company
Lents homeowners call us back because we show them what we found. Every duct repair starts with a camera inspection - you’ll see the silt lines, the separated flex connections, the mold colonies yourself. No claims without proof. That’s been our way for over 42 years.
Our technicians are background-checked, uniformed, and trained specifically on the retrofit ductwork common in Lents’s 1920s-1950s housing stock. They know how to work in tight crawl spaces without damaging original floor joists. Calls are answered by a live person 24 hours a day - not a voicemail tree, not an app. If the work isn’t right, we return at no charge with no paperwork required. That’s the 90-Day Done Right Promise, and it’s non-negotiable.
We also offer a Free Second Opinion on Any Written Estimate, $50 Off Any Repair Over $250, and a permanent 5% Senior and Veteran discount. The price we quote on the phone is the price on the invoice. No bait coupons, no changes at the door.
Our Duct Repair & Sealing Services in Lents
Flex Duct Repair
Flex duct is the weak link in most Lents crawl spaces. The neighborhood’s pre-war and post-WWII bungalows were retrofitted with flex duct decades ago, and those plastic-sleeved runs weren’t built to sit in damp, debris-filled conditions year after year. We regularly find flex duct in Lents that has separated at the plenum, collapsed under its own weight, or been chewed through by rodents drawn to the moisture. Our flex duct repair includes full section replacement when needed, proper support strapping to prevent sagging, and sealed connections that won’t pull apart when the system cycles on and off. In flood-affected homes near Johnson Creek, we often recommend upgrading to rigid metal duct instead.
Mastic Sealant Application
Metal ductwork in older Lents homes develops leaks at every joint and seam - it’s not a matter of if, but when. Duct tape dries out and fails; mastic sealant is the only permanent fix we trust. We brush on professional-grade mastic to every connection, elbow, and register boot, creating a flexible, airtight bond that holds through Portland’s wet winters and Lents’s amplified crawl-space humidity. A typical mastic sealing job for a Lents ranch home runs $320-$480 and usually cuts heating costs measurably. We verify the seal with post-work camera inspection, so you see the difference.
Metal Duct Repair
When Lents homeowners have original galvanized steel duct from mid-century retrofits, we see rust-through, separated seams, and holes where fasteners have corroded away. Metal duct repair requires cutting out damaged sections, fabricating replacement pieces to fit existing runs, and sealing with mastic and mechanical fasteners. Near SE Woodstock and the lower Johnson Creek basin, we’ve replaced entire trunk lines where flood exposure accelerated rust to the point of collapse. Rigid metal duct, properly sealed, outlasts flex duct by decades in Lents conditions.
Duct Insulation
Uninsulated or degraded duct insulation in Lents crawl spaces creates condensation problems that compound everything else. Warm air hits cold metal in a damp crawl space, water drips, and mold follows. We install foil-faced fiberglass insulation or closed-cell foam wrap depending on the application, with particular attention to supply runs in flood-prone areas where moisture management is critical.
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 Lents
We stock parts and use equipment from Nikro, Honeywell, and Aprilaire - brands that serious HVAC contractors specify, not the discount hardware-store lines. For Lents homeowners, this means faster turnaround because we’re not waiting on special orders. Our Rotobrush cleaning systems and Nikro negative-air machines handle the heavy particulate and mold loads we encounter in flood-affected ductwork. When we recommend a component, it’s because we’ve installed it in conditions like yours and watched it hold up.
Common Duct Repair & Sealing Problems We See in Lents Homes
- Flood silt hardened inside ductwork. Past Johnson Creek flooding left mineral deposits in crawl-space ducts that no cleaning removes. The silt lines are visible evidence, and airflow blockage requires full section replacement.
- Aging flex-duct connections failing at the plenum. Retrofit flex duct in Lents’s pre-war homes separates under moisture weight and debris accumulation, dumping conditioned air into the crawl space instead of the living area.
- Mold colonies returning after cleaning. When ducts hold silt deposits, surface cleaning leaves the nutrient base intact. Musty odors return within weeks unless contaminated material is physically removed and replaced.
- Condensation rusting metal duct from the outside in. Portland’s damp winters hit Lents crawl spaces harder than higher-elevation neighborhoods, accelerating corrosion on uninsulated steel runs.
Pricing for Duct Repair & Sealing in Lents, OR
Most duct repair and sealing jobs in Lents fall between $280 and $650. Here’s how typical work breaks down:
| Service | Typical Range in Lents |
|---|---|
| Mastic sealant (full system) | $320-$480 |
| Flex duct section replacement | $180-$340 per run |
| Metal duct repair (patch/seam) | $220-$380 |
| Full metal trunk line replacement | $580-$950 |
| Duct insulation (per run) | $140-$260 |
What moves the number: accessibility of your crawl space, extent of flood damage requiring material removal, and whether we’re sealing existing duct or replacing contaminated sections. We disclose every dollar before work begins. Estimates are free, and we honor our $50 Off Any Repair Over $250. Call (844) 685-6342 for your exact quote.
We Also Serve Cities Near Lents
Our service area extends to Lents and surrounding communities including Happy Valley, Milwaukie, Clackamas, and Jennings Lodge. The same technicians, same equipment, same upfront pricing apply across southeast Portland and into Clackamas County.
Serving Lents, OR - Our Local Coverage Area
We’re based in the Lents 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 Lents
Yes. Lents’s position in the Johnson Creek floodplain means documented flooding events have sent water and silt directly into crawl-space ductwork, leaving visible silt lines and mineral deposits that are measurably more prevalent here than in higher-elevation Portland neighborhoods. If your home was built before 1996 and has original or older retrofit duct, flood contamination should be the first thing checked. Call (844) 685-6342 and we’ll camera-inspect at no charge with repair.
We don’t repair it - we replace it. Flood silt embeds in flex duct’s porous liner and insulation; cleaning leaves the mineral base and mold colonies intact. We cut out the contaminated section, install new rigid metal or fresh flex duct as appropriate, and seal all joints with mastic. On a 1940s bungalow near SE 92nd and Harold, we unsealed a flex-duct run that showed a distinct silt line from the 1996 flood. The homeowner had noticed worsening allergies each spring, and our inspection revealed a half-inch of dried silt and black mold inside the main return. We cut out the contaminated section, installed new Rotobrush-cleaned rigid metal duct, and sealed all joints with mastic.
Mastic sealant permanently seals leaks at joints, seams, and small corrosion holes in metal ductwork, but it cannot repair rust-through or structural collapse. For a typical Lents ranch home with separated seams and minor rust, mastic application runs $320-$480 and restores system efficiency. If the metal has deteriorated past sealing, we quote section replacement upfront with no pressure. Call (844) 685-6342 for a camera inspection and honest assessment.
Lents’s pre-war and post-WWII housing stock was retrofitted with flex duct into existing crawl spaces, and decades of Johnson Creek moisture exposure have degraded the material past the point of reliable repair. The plastic liner becomes brittle, the insulation compresses, and connections separate. Replacement with properly supported rigid metal duct or new flex duct solves the problem permanently rather than patching symptoms. Our 90-Day Done Right Promise covers the full installation.
Yes. Flood-damaged duct repair is a defining part of our Lents work. We remove silt-laden sections, treat surrounding areas for mold, install clean replacement duct, and verify with post-work camera inspection. We do not simply clean and hope - we physically remove contaminated material. If your home is in the 97266 ZIP or near the Johnson Creek corridor, mention possible flood history when you call (844) 685-6342 and we’ll prioritize silt-line inspection.
Ready to stop losing heated air to your crawl space? Call Bellows Air Duct & Vent Co. at (844) 685-6342 for a free estimate on duct repair and sealing in Lents. We’ll show you what we find, quote one honest price before we start, and stand behind the work for 90 days in writing.
Written by Ray Castillo, Owner at Bellows Air Duct & Vent Co., serving Lents since 1984.