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.
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AfterNikro Duct Repair & Sealing in San Antonio: What to Know First
We provide independent Nikro duct repair and sealing in San Antonio, with most residential jobs completed in a single scheduled visit and a written price delivered before any panel comes off. Typical repair work runs $340-$780 for standard flex or metal duct sealing, while full section replacement with mastic sealant and insulation recovery lands between $890-$1,650 depending on accessibility and plenum involvement. This page is for Nikro equipment owners in San Antonio who need actual ductwork repair, not a sales pitch for unrelated services. Call (726) 600-7155 for a free written estimate with no obligation.
How Nikro Products Fail - and How We Fix Them
- NIKRO HP20 & HP20G flex duct: collar separation at the plenum inlet. The vinyl-to-wire-bond on early HP20 runs tends to soften after three to four San Antonio summers, especially in attic spaces that hit 140°F in August. The collar pulls back from the plenum (the main distribution box), creating a gap that blows conditioned air into the attic. We cut back to sound wire, install a galvanized draw-band collar, and seal with fire-rated mastic - not foil tape, which fails in that heat cycle.
- NIKRO SL20 metal duct: seam pop at longitudinal joints. The SL20’s Pittsburgh-lock seams can work open where the sheet metal gauge steps down at the 12-inch diameter transition. We see this most in Alamo Heights and Monte Vista homes with original 1980s installations. Our fix is a spot repair with a S-cleat and drive, then two-coat mastic sealant with embedded fabric mesh for structural recovery.
- NIKRO HP20G insulated flex: inner-liner collapse behind the vapor barrier. The fiberglass blanket between inner and outer liners compacts over time, especially on long horizontal runs in San Antonio’s humidity. The duct looks intact from outside but airflow drops by 30% or more. We scope the run, document the collapse with photos, and replace the section with R-8 flex duct - Nikro-specified or equivalent - rather than attempting recovery of the compromised liner.
- NIKRO transition boots: stress cracking at register connections. The injection-molded plastic boots used in Nikro residential systems develop fatigue cracks where the rectangular-to-round transition meets the floor or ceiling register boot. These cracks bypass the duct entirely, dumping air into wall cavities. We replace with galvanized sheet-metal boots and seal with mastic, which outlasts the OEM plastic by a decade in local conditions.
- NIKRO SL20/SL24: corrosion pinhole at low points in horizontal runs. San Antonio’s humidity swings - 85% morning to 40% afternoon in spring - create condensation pooling where metal duct sags on inadequate supports. Pinholes form, then rust-through. We replace the affected section, add proper support strapping at 4-foot intervals per SMACNA guidelines, and insulate to prevent future condensation.
Our Nikro Duct Repair & Sealing Process
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Camera inspection and written scope. We run a borescope through every accessible duct run, photograph the failure, and show you before writing anything. The camera goes in first. Then we talk.
- 2
Parts decision: OEM Nikro or verified equivalent. We stock common Nikro flex diameters and metal fittings. If your system uses a discontinued SL24 transition or an HP20G-specific collar, we source direct or specify an aftermarket part that meets the same pressure and temperature ratings - documented on your invoice.
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Written price under Haven Standard Clause 1. You get one flat price for the complete repair, not per-foot or per-vent arithmetic. No work starts until you have that number in writing.
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Repair with negative-pressure verification. We seal or replace, then pressurize the system and verify with a manometer that static pressure returns to Nikro design specs - typically 0.5 inches water column for residential.
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Documented Photo Record and 365-Day Done Right Promise. After photos of every repaired run, delivered with your job record. If the seal fails or the repair doesn’t hold, we make it right - backed in writing, not subject to manager approval.
BeforeAfterWhat Nikro Duct Repair & Sealing Costs in San Antonio
| Repair Type | Typical Range | What Moves Price |
|---|---|---|
| Single flex duct collar reseal (HP20/HP20G) | $340-$520 | Attic access, plenum location, insulation recovery |
| Metal duct seam repair with mastic (SL20) | $420-$680 | Length of seam, need for S-cleat reinforcement |
| Section replacement, flex or metal (up to 15 ft) | $780-$1,150 | Diameter, insulation R-value, register boot replacement |
| Full plenum reseal + multiple run recovery | $1,250-$1,650 | Plenum size, number of takeoffs, corrosion extent |
These are whole-system prices, not per-vent bait. The exact number depends on what the camera shows. Call (726) 600-7155 for a free written estimate - we’ll put our number next to any competitor’s quote under our Free Second Opinion policy.
Why San Antonio Homeowners Call CleanRun Air Duct Cleaning San Antonio for Nikro Work
We’ve been in San Antonio homes since 2013, and we’ve learned that Nikro systems reward technicians who know the difference between an HP20 collar failure and a full liner collapse. Our crew is background-checked and uniformed under Haven Standard Clause 3: Verified Crews. Tomas Reyes, our owner, trained in HVAC systems technology at Queensborough Community College and spent years on ductwork in the Northeast before building CleanRun’s San Antonio operation. We also service Lennox, Trane, and Carrier duct systems - useful when your home has mixed-brand equipment or when a previous owner spliced incompatible lines. Every job ends with a photo record, a written price that won’t change, and a 365-Day Done Right Promise you can hold in your hand.
FAQs
No - Nikro’s limited warranty covers defects in materials and workmanship, not subsequent field repairs by independent technicians. As an independent Nikro service provider, we use parts and practices that don’t trigger warranty disputes. We document everything so you have a record if a factory defect claim ever arises. Call (726) 600-7155 if you need help interpreting your warranty paperwork.
Replacement is the better call when the camera shows multiple failure points in a single run, corrosion has eaten through more than 30% of a metal section, or flex liner collapse extends beyond one straight segment. Isolated collar separations, single seam pops, or localized boot cracks are typically repairable. We show you the scope photos and explain which category your system falls into before any price is written. Call (726) 600-7155 for a free inspection.
We stock current Nikro flex duct, collars, and transition fittings. For discontinued lines like the SL24 or early HP20G variants, we source verified-equivalent parts from Abatement Technologies or fabricate from galvanized sheet metal to matching specs - documented on your invoice with manufacturer and rating. You see exactly what goes in before it goes in. Call (726) 600-7155 to confirm parts availability for your specific model.
Single-point repairs - one collar reseal or seam fix - usually run three to four hours including setup, testing, and cleanup. Multi-run jobs with plenum work or section replacement can extend to a full day. We schedule by the job, not by the hour, so the crew isn’t watching a clock. Call (726) 600-7155 to book a slot that fits your schedule.
Verify two things: the manometer reading at your air handler showing restored static pressure, and the Documented Photo Record of every repaired run delivered to you before the crew leaves. If either is missing, something is incomplete. The 365-Day Done Right Promise covers any seal failure or workmanship issue - no manager approval needed, just the written guarantee you received. Call (726) 600-7155 if you have any concern within that window.
Written by Tomas Reyes, Owner, CleanRun Air Duct Cleaning San Antonio at CleanRun Air Duct Cleaning San Antonio, serving San Antonio and nearby areas.