Fast, Reliable Duct Repair & Sealing Across Fresno
Most duct repair companies in Fresno treat a detached workshop on a 5-acre property the same as a suburban closet. We don’t. Our Duct Repair & Sealing team carries heavy-duty metal duct, reinforced hangers, and mastic sealant rated for agricultural environments because that’s what Fresno’s rural properties actually need. We’re on the road to 93706, 93702, and the surrounding acreage daily. Call (844) 685-6342 and we’ll give you a real arrival window, not a 6-hour guess.
Why Bellows Air Duct & Vent Co. Is Fresno’s Preferred Duct Repair & Sealing Company
We’ve been driving the long service roads of Fresno County since 2012. Ray Castillo built this company on the principle that a square deal means showing up when promised, pricing the job before touching a tool, and fixing it for good.
Fresno homeowners know the difference between a technician who understands agricultural property and one who’s lost past Herndon Avenue. Our background-checked, uniformed crews work the 93706 zip code weekly. They know which ranch-style attics hit 140°F by July and which detached shops have oversized doors that vibrate standard ductwork apart.
Every repair gets camera-inspected before and after. Our 90-Day Done Right Promise is stamped on every invoice - if it’s not right, we return at no charge with no paperwork required. Calls reach a live person 24 hours a day, not a voicemail tree.
We’re not the cheapest option in Fresno. We’re the one you don’t have to call twice.
Our Duct Repair & Sealing Services in Fresno
Duct Sealing with Mastic Sealant
Fresno’s trapped valley air forces central AC to run hard five months straight. Every joint and seam in your ductwork flexes with thermal expansion, and standard tape fails within a season. We seal with professional-grade mastic compound - the same approach Abatement Technologies specifies for contaminated environments - because agricultural dust from surrounding almond and cotton operations finds every gap. In 93706 and 93702, we regularly find return plenums pulling raw attic air through gaps you could slide a pencil through. Mastic seals those permanently, not until the next heat wave.
Flex Duct Repair
Flex duct in Fresno attics faces a brutal cycle. Summer attic temperatures exceed 140°F, degrading the inner liner. Winter tule fog drives humidity through cracked seals. The result is collapsed runs, separated connections, and duct that’s pulling 150°F attic dust instead of conditioned air. We replace with properly sized flex or convert to metal where the application demands it. Every repair is hanger-reinforced for properties with heavy-duty equipment nearby.
Metal Duct Repair
Central and southeast Fresno’s 1950s-1970s ranch homes came with original sheet-metal runs that have now seen 50+ years of thermal cycling. We repair separated seams, replace rusted sections, and reinforce hangers that weren’t built for modern blower torque. For detached workshops with oversized doors, we install heavier-gauge metal duct with reinforced suspension - the standard residential stuff bends and separates under agricultural equipment vibration. We stock the parts so most metal repairs finish in one trip.
Duct Insulation
Unconditioned Fresno attics waste enormous energy through poorly insulated duct. We install foil-faced fiberglass or closed-cell insulation wraps rated for San Joaquin Valley temperature extremes. North Fresno’s longer 1980s-90s duct runs particularly benefit - the farther your air travels through a 140°F attic, the more critical insulation becomes. Proper insulation also reduces condensation during tule fog season, when temperature swings can create moisture inside duct walls.
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 Fresno
We carry Rotobrush inspection and cleaning equipment, stock mastic and sealants from Abatement Technologies, and specify Aprilaire filtration for properties dealing with Fresno’s heavy particulate load. Having the right parts on the truck matters when you’re driving 20 minutes between rural properties. We don’t order and return. We fix it while we’re there.
Common Duct Repair & Sealing Problems We See in Fresno Homes
- Tule fog moisture wicks into cracked mastic seals, causing seasonal mold blooms in ranch-style attics that coastal California never experiences. We reseal with moisture-resistant compound and inspect insulation for condensation damage.
- Overweight garage doors bend standard duct hangers on agricultural properties. We replaced a metal duct run feeding a detached workshop on a 5-acre property near the 93706 zip code. The original flex duct had collapsed under the weight of 140°F attic heat and the homeowner’s heavy-duty garage door opener vibrations loosened every joint. We replaced with Rotobrush-brand mastic-sealed metal duct and reinforced all hangers to withstand the torque from the oversized door.
- Agricultural PM10 from harvest clogs return-air plenums in 93706 within weeks, forcing duct leaks that draw in raw attic dust. Standard 1-inch filters can’t keep up during August through October. We upgrade filtration and seal plenum connections against the pressure differential.
- Springs snap mid-winter, dropping duct runs onto equipment in detached shops. We install seismic-rated hangers and flexible connections where vibration transfer is an issue.
Air Duct Cleaning in Fresno, Done the Old Craft Way
The Central Valley runs hot and dry, then foggy and damp. That swing loads dust into every system we see. We inspect with a camera, clean to the collar, and show you the duct before and after. Dryer vents get cleared to code, because lint fires are preventable and we treat your house like we’d treat our mother’s. One honest price, no surprises on the bill. we coordinate through our Fresno / Central Valley Metro service area
Clean Air for Fresno, Done the Old Craft Way
Central Valley dust and pollen have a way of settling deep in ductwork. We inspect with a camera before we touch a thing, clean to the collar, and show you the after. Dryer vents get cleared to code because lint fires are preventable, not hypothetical. One honest price, written down before we start. No $49 bait that turns into $800 at your door.
Our Keystone Standard is 90 days, in writing, no arguing. we coordinate through our Fresno / Central Valley Metro service area Senior and veteran homeowners save 5% every day. We’ll be there when we say.
Clean Air for Fresno, Done the Old Craft Way
Central Valley dust and pollen have a way of settling deep in ductwork. We inspect with a camera before we touch a thing, clean to the collar, and show you the after. Dryer vents get cleared to code because lint fires are preventable, not hypothetical. One honest price, written down before we start. No $49 bait that turns into $800 at your door.
Our Keystone Standard is 90 days, in writing, no arguing. we coordinate through our Fresno / Central Valley Metro service area Senior and veteran homeowners save 5% every day. We’ll be there when we say.
Clean Air for Fresno, Done the Old Craft Way
Central Valley dust and pollen have a way of settling deep in ductwork. We inspect with a camera before we touch a thing, clean to the collar, and show you the after. Dryer vents get cleared to code because lint fires are preventable, not hypothetical. One honest price, written down before we start. No $49 bait that turns into $800 at your door.
Our Keystone Standard is 90 days, in writing, no arguing. we coordinate through our Fresno / Central Valley Metro service area Senior and veteran homeowners save 5% every day. We’ll be there when we say.
Pricing for Duct Repair & Sealing in Fresno, CA
A typical mastic sealing job for a Fresno ranch-style home runs $280-$450. Flex duct replacement in a standard attic costs $180-$340 per run. Metal duct repair - seam sealing, section replacement, hanger reinforcement - ranges $320-$580 depending on accessibility. Full duct insulation for a 1,500-square-foot home with attic ductwork runs $890-$1,400.
Rural properties with detached workshops, longer duct runs, or heavy-duty requirements may run 15-25% above these ranges due to material and labor. We disclose every dollar before starting. No bait coupons, no price changes at the door. Our $50 Off Any Repair Over $250 applies to qualifying jobs, and we offer a Free Second Opinion on Any Written Estimate if you’ve already been quoted elsewhere.
Call (844) 685-6342 for an exact quote - estimates are free.
We Also Serve Cities Near Fresno
Our service radius covers the full San Joaquin Valley floor. We regularly work Duct Repair & Sealing in Fresno and surrounding communities including Clovis, Sanger, Selma, and Bonadelle Ranchos-Madera Ranchos. Same standards, same live-answer phone line, same 90-Day Done Right Promise.
Serving Fresno, CA - Our Local Coverage Area
We’re based in the Fresno 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 Fresno
Properly applied mastic sealant with reinforced hangers lasts 10-15 years even under agricultural equipment vibration, assuming the door opener is properly isolated. We warranty our sealing work for 90 days under our Done Right Promise, and we’ve returned to 93706 properties after eight years to find seals still intact. The key is using metal duct and heavy-duty hangers, not standard residential flex. Call (844) 685-6342 for an exact quote - estimates are free.
Ambient PM10 from almond and cotton harvest spikes to levels that overwhelm standard 1-inch filters in days rather than months. Your return-air plenum is pulling concentrated agricultural dust through every small leak in the duct system, loading the filter faster than the house’s natural infiltration would suggest. We seal plenum connections and often recommend upgraded filtration. Call (844) 685-6342 for an exact quote - estimates are free.
Tule fog introduces brief high-humidity periods that allow dust-laden duct interiors to absorb moisture, degrading standard tape and becoming a substrate for mold. Mastic sealant resists this cycle; tape does not. We inspect for moisture damage during fall sealing jobs. Call (844) 685-6342 for an exact quote - estimates are free.
Metal duct repair with mastic-sealed seams and reinforced hangers outlasts any flex conversion for these homes. The original sheet metal was built thicker than modern stock; we preserve what we can and replace rusted sections with matching gauge. Most 93703 jobs complete in one visit. Call (844) 685-6342 for an exact quote - estimates are free.
We replace collapsed flex with metal duct rated for the application. Garage-attic flex in Fresno fails predictably - 140°F ambient plus equipment vibration. We convert to mastic-sealed metal with reinforced hangers that handle the environment. Call (844) 685-6342 for an exact quote - estimates are free.
Written by Ray Castillo, Owner at Bellows Air Duct & Vent Co., serving Fresno since 2012.