Fast, Reliable Duct Repair & Sealing Across Brooklyn
Most duct repair jobs in Brooklyn run $180-$650 depending on whether we’re sealing a few joints or replacing corroded metal runs, and our Duct Repair & Sealing team can usually be there same day you call. We’re familiar with the tight access, non-standard retrofits, and parking logistics that come with working in Brooklyn’s row houses and brownstones - from Bed-Stuy to Borough Park, from Crown Heights down to East Flatbush. If your ducts are leaking conditioned air into wall cavities, pulling kitchen odors through shared chases, or just not delivering airflow to the back bedroom, we’ll diagnose it with a camera, show you what we find, and quote the repair before we start. Call (844) 685-6342. We answer live, 24 hours a day.
Why Bellows Air Duct & Vent Co. Is Brooklyn’s Preferred Duct Repair & Sealing Company
We’ve been at this since 1984 - over 42 years - and Ray Castillo has kept the same standard since day one: one honest price shown before we start, and a 90-Day Done Right Promise stamped on every job. No bait coupons, no price changes at the door.
Brooklyn homeowners call us back because we’ve seen what their buildings do to ductwork. The brownstone belt alone - Bed-Stuy, Crown Heights, Clinton Hill, Carroll Gardens - holds thousands of 1880s-1920s row houses that were never built for forced air. When owners retrofit central air or mini-duct systems through original plaster-and-lath bays, the resulting runs are cramped, non-standard, and prone to gaps that pull in dust from century-old wall cavities. We know how to seal those without damaging the plaster. That’s not theory - it’s what we did last Tuesday for a customer off Nostrand Avenue in Crown Heights.
Our technicians are background-checked, uniformed, and carry professional-grade equipment from Rotobrush, Aprilaire, and Abatement Technologies. Most repairs finish in a single visit. And when you call (844) 685-6342, a live person answers - not a voicemail, not an app - any hour of the day or night.
Our Duct Repair & Sealing Services in Brooklyn
Duct Sealing
Leaky ducts in Brooklyn waste 20-30% of conditioned air on average, and in older buildings with retrofitted systems, that number climbs higher. We seal joints, seams, and disconnected runs using mastic sealant and metal-backed tape rated for HVAC use - not the hardware-store stuff that peels off in humid conditions. Brooklyn’s maritime humidity, driven by surrounding water on three sides, makes proper sealing especially critical; poorly sealed ducts here draw moisture-laden air that accelerates mold growth inside the system. We camera-inspect before and after so you see the difference.
Flex Duct Repair
Flex duct gets kinked, crushed, or disconnected at tight turns - and in Brooklyn brownstones, every turn is tight. These buildings’ original joist bays weren’t designed for 6-inch flex runs, so installers often squeeze ducts through irregular spaces where they sag, pinch, or pull loose from collars. We replace damaged sections with properly supported flex, secure connections with mechanical fasteners plus mastic, and route around obstacles without cutting structural members. In Clinton Hill and Carroll Gardens, we’ve learned which floor bays are workable and which need creative routing.
Metal Duct Repair
Here’s where Brooklyn gets specific. In East Flatbush, Flatbush, and Borough Park - ZIPs 11203, 11204, 11210 - the stock of 1950s-1960s semi-detached brick homes often has original sheet-metal ductwork installed during construction. That metal is now 60-plus years old, corroding at seams, and coated with decades of cooking grease particulate drawn in from adjacent kitchen exhaust. Kitchen and supply-air chases share the same interior wall in these dense row-building styles, a combination you don’t see in suburban construction. We cut out corroded sections, fabricate replacement metal to fit, and seal seams with mastic so grease and odors don’t recirculate.
Mastic Sealant Application
We recently sealed a leaking metal duct seam in a brownstone off Nostrand Avenue in Crown Heights. The owner had installed a mini-duct system through original plaster-and-lath joist bays; we used Mastic Sealant from our Aprilaire inventory to repair a disconnected joint pulling dust from the 1890s wall cavity, restoring static pressure and cutting allergens. Mastic outlasts tape in Brooklyn’s humid conditions, and we apply it to every seam on repair jobs - not just the obvious leaks.
Duct Insulation
Uninsulated or degraded duct insulation in Brooklyn’s unconditioned basements and crawl spaces drives energy bills up and creates condensation that feeds mold. We replace insulation with materials rated for the temperature differentials these spaces see, paying special attention to runs that pass through exterior walls where thermal bridging is worst. In pre-war buildings with irregular construction, we fit insulation around obstacles that standard products don’t accommodate.
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 Brooklyn
We stock parts and materials from Rotobrush, Aprilaire, and Abatement Technologies - the same brands serious HVAC contractors specify - so most Brooklyn repairs don’t wait on ordered components. That matters when you’re in a 11210 semi-detached with corroded metal ducts leaking into a shared kitchen chase, or a Crown Heights brownstone where a disconnected mini-duct run is blowing unfiltered air from inside a 130-year-old wall. We carry mastic sealants, mechanical fasteners, flex duct in multiple diameters, and sheet metal fabrication tools on every truck. Fast turnaround isn’t a slogan here; it’s having what we need when we pull up to your curb.
Common Duct Repair & Sealing Problems We See in Brooklyn Homes
- Disconnected flex duct at tight turns in retrofitted joist bays. Brownstone and row-house retrofits force flex duct through spaces never meant for it. The bends kink or pull loose from collars, sucking dust from century-old plaster cavities and dropping airflow to back rooms.
- Corroded sheet-metal seams in 1950s semi-detached homes. In Borough Park, Flatbush, and East Flatbush, original metal ductwork has spent 60 years in humid wall chases shared with kitchen exhaust. Grease particulate accelerates corrosion; seams leak conditioned air into walls and pull cooking odors back through supply vents.
- Compromised mastic seals on non-standard diameter retrofits. Brownstone mini-duct systems use diameters and fittings that don’t match standard HVAC catalogs. Previous repairs with wrong-size materials fail, causing pressure loss, uneven airflow, and whistling at registers.
- Moisture-driven mold inside poorly sealed duct systems. Brooklyn’s elevated humidity - higher than inland New York metros due to surrounding waterways - infiltrates ducts through gaps and drives microbial growth that standard cleaning intervals don’t catch.
Pricing for Duct Repair & Sealing in Brooklyn, NY
We’re upfront about numbers because nobody likes a surprise on the invoice. Here’s what duct repair and sealing typically costs in Brooklyn’s market:
- Basic duct sealing (mastic application to accessible joints): $180-$320
- Flex duct repair or section replacement: $220-$450
- Metal duct repair - seam sealing, patch fabrication: $280-$550
- Corroded metal duct replacement (per section): $350-$650
- Mini-duct system repair in tight brownstone joist bays: $300-$580
Factors that move the price: accessibility (crawl spaces and sealed basements take longer), extent of corrosion or damage, whether we need to fabricate non-standard fittings, and if asbestos-adjacent materials require containment protocols. We show you the camera footage, explain what needs doing, and give you the full price before we start. Estimates are free. Seniors and veterans receive a permanent 5% discount. Repairs over $250 qualify for $50 off. And if you’ve got a written estimate from another company, we’ll give you a free second opinion.
We Also Serve Cities Near Brooklyn
Our service area extends beyond Brooklyn to include Brooklyn neighbors in Detroit-Shoreway, Parma, Parma Heights, and Clark-Fulton. Same standards apply: camera inspection, upfront pricing, and the 90-Day Done Right Promise on every job.
Serving Brooklyn, NY - Our Local Coverage Area
We’re based in the Brooklyn 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 Brooklyn
Yes - we access ducts through existing registers, utility chases, and removable panels rather than cutting plaster. In Clinton Hill and throughout the brownstone belt, we’ve sealed countless retrofitted systems by working through the openings the original installers used, applying mastic to joints with long-reach tools and verifying seals with camera inspection. Call (844) 685-6342 for a free estimate - we’ll show you exactly how we’d reach your leaks.
We cut out the corroded section through the nearest accessible opening - usually a register boot or junction box - then fabricate a replacement segment that fits the original dimensions, and seal all connections with mastic. In Flatbush and Borough Park, where these 60-year-old metal runs are common, we’ve developed techniques to work within concrete-embedded chases without destructive access. The repair is permanent and carries our 90-Day Done Right Promise. Call (844) 685-6342 to schedule a camera inspection.
Yes - we seal the duct perimeter where it passes through the shared chase, repair any gaps in the duct wall itself, and verify with pressure testing that kitchen air can no longer infiltrate. This is a signature problem in Brooklyn’s 1950s-1960s semi-detached homes, where kitchen and supply ducts were routed through the same interior wall. We’ve solved it repeatedly in East Flatbush, Flatbush, and Borough Park. Call (844) 685-6342 - estimates are free.
Yes - mini-duct systems are our specialty in Crown Heights, Bed-Stuy, and Clinton Hill. We replace crushed or disconnected small-diameter flex, secure it with proper supports so it doesn’t sag, and seal every joint with mastic rated for the application. We recently sealed a leaking metal duct seam in a brownstone off Nostrand Avenue in Crown Heights using exactly this approach. Camera inspection confirms airflow restoration before we leave. Call (844) 685-6342.
We do not disturb asbestos-containing materials - if we suspect asbestos-adjacent insulation, we stop work and recommend a licensed abatement contractor for safe removal before we proceed. Many pre-1980 Brooklyn buildings, especially in the brownstone belt, have old insulation that requires testing. We can seal accessible metal joints and seams without touching suspect materials, but full duct access work waits for proper clearance. Your safety comes before our schedule. Call (844) 685-6342 and we’ll assess what can be done safely during your free estimate.
Ready to stop losing conditioned air into your walls? Call Bellows Air Duct & Vent Co. at (844) 685-6342 for a free estimate on duct repair and sealing in Brooklyn. We’ll camera-inspect your system, show you exactly where it’s leaking, and give you one honest price before we start - backed by our 90-Day Done Right Promise in writing. Ray Castillo and our team have served homeowners like you for over 42 years. We’ll be there when we say.
Written by Ray Castillo, Owner at Bellows Air Duct & Vent Co., serving Brooklyn since 1984.