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Pressure Tested Before & After  ·  Mastic Sealant  ·  Every Leak Point Found  ·  Guaranteed
Duct Sealing · Kenmore, WA

Duct Sealing in Kenmore, WA —
Call Now for Same-Day Scheduling.

Pressure testing before sealing quantifies total leakage. Every leak point located and sealed with correct materials. Post-sealing pressure test documents the improvement. Every service guaranteed.

Pressure Tested Before & After
Mastic Sealant
Every Leak Point Found
Guaranteed
Professional Duct Sealing

Professional Duct Sealing in Kenmore, WA

Your energy bills are higher than they should be for the amount of heating and cooling your home requires in Kenmore. Certain rooms will not reach the right temperature regardless of how long the HVAC runs in Kenmore, WA. You have had the equipment checked and it is working correctly in Kenmore. If the equipment is fine but the home is not comfortable and the bills are high, the problem is almost certainly in the distribution system in Kenmore, WA. Specifically, in duct leaks that are allowing conditioned air to escape into unconditioned attic or crawl space before it reaches the rooms you are paying to heat and cool in Kenmore.

Duct leakage happens at every unsealed joint between duct sections, at every branch takeoff from the trunk line, at every register boot connection in the walls and ceilings, and at the connections where the duct system meets the air handler in Kenmore, WA. The Department of Energy estimates that typical residential duct systems lose 20 to 30 percent of conditioned air through leakage in Kenmore. For a home spending $200 per month on heating and cooling, that is $40 to $60 per month escaping through duct leaks to the attic or crawl space in Kenmore, WA.

MBM Air Duct Cleaning finds and seals duct leaks throughout Kenmore, WA in Kenmore. Pressure testing before sealing to quantify the total leakage in Kenmore, WA. Systematic identification of every specific leak point through the accessible system in Kenmore. Correct sealant materials applied to every leak point in Kenmore, WA. Post-sealing pressure testing to document the improvement with measured numbers in Kenmore. And a guarantee on every sealing service in Kenmore, WA. Call now for same-day scheduling in Kenmore.

Why Correct Sealant Materials Last While Duct Tape Fails in Kenmore, WA

Standard duct tape uses a rubber-based adhesive that performs at room temperature but dries and loses adhesion when repeatedly exposed to the temperature extremes that duct systems experience during HVAC operation in Kenmore. A supply duct carrying cold conditioned air through a 130-degree summer attic cycles through extreme temperatures with every cooling cycle in Kenmore, WA. Standard duct tape adhesive is not formulated for this cycling and fails within a few seasons in Kenmore. Mastic sealant remains flexible after curing and maintains its seal through years of thermal cycling in Kenmore, WA. UL 181-rated foil tape maintains adhesion for 20 years or more in normal duct system conditions in Kenmore.

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Where Leaks Occur

Where Duct Leaks Occur and Why They Develop in Kenmore, WA

At Every Unsealed Duct Joint Throughout the System in Kenmore

Every connection between duct sections is a potential leak point in Kenmore, WA. In most residential installations, these joints were mechanically fastened without sealant during installation in Kenmore. Over years of thermal cycling that expands and contracts the ductwork with every HVAC cycle, even joints that were initially sealed with standard duct tape have failed as the tape dried and lost adhesion in Kenmore, WA.

At Branch Takeoffs From the Main Trunk Line in Kenmore, WA

Branch takeoffs split conditioned air from the main trunk line into the individual branch runs serving each room in Kenmore. They have multiple edges and angles that create significant potential leak area if not correctly sealed in Kenmore, WA. Branch takeoff leaks are among the largest individual leak points in typical residential duct systems in Kenmore.

At Register Boot Connections in Walls and Ceilings in Kenmore

The register boot connects the branch duct run to the wall, ceiling, or floor opening where the supply register mounts in Kenmore, WA. The connection between the flexible duct and the boot collar and the connection between the boot and the surrounding framing are both common significant leak points in Kenmore. Conditioned air escaping at the boot level leaks into the wall or ceiling cavity rather than through the register into the room in Kenmore, WA.

Why Original Installation Sealant Fails Over Time in Kenmore, WA

Systems sealed with standard duct tape develop leakage as the tape dries, cracks, and loses adhesion from temperature cycling in Kenmore. Standard duct tape on duct joints typically fails within three to five seasons of thermal cycling in Kenmore, WA. Joints that were sealed with standard tape appear sealed when first applied and are open to leakage again within a few years in Kenmore.

What Leakage Costs You

What Duct Leakage Costs You in Kenmore, WA

20–30%
DOE: Conditioned Air Lost
$40–$60
Per Month Wasted at $200/mo
$600+
Annual Waste at $200/mo Budget

How Leaking Ducts Create Comfort Problems Room by Room in Kenmore, WA

Supply duct leakage between the trunk line and the registers means rooms furthest from the air handler receive less conditioned air than they were designed to receive in Kenmore. The conditioned air that leaks out before reaching the register does not reach the room in Kenmore, WA. Rooms at the end of long duct runs with multiple leak points along the way receive the cumulative effect of all those leaks in Kenmore. The room that is always too hot in summer and too cold in winter is often at the end of a duct run with multiple unsealed joints in Kenmore, WA.

What Return Duct Leaks Do to Your Indoor Air Quality in Kenmore, WA

Return duct leaks draw air from the surrounding unconditioned space into the return airstream in Kenmore. A return duct leak in an attic draws hot, dusty attic air into the air handler in summer in Kenmore, WA. A return duct leak in a crawl space draws crawl space air including moisture, mold spores, and soil particulate into the system in Kenmore. This unconditioned air bypasses the filter and is distributed throughout the home in Kenmore, WA.

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Our Sealing Process

MBM's Duct Sealing Process in Kenmore, WA

1

Pressure Testing to Establish Total Leakage in Kenmore

MBM Air Duct Cleaning performs a duct pressure test before any sealing begins in Kenmore, WA. A calibrated fan is connected to the duct system and pressurized to a standard test pressure in Kenmore. The measured airflow represents the total leakage rate and provides the baseline for comparing with the post-sealing result in Kenmore, WA.

2

Systematic Leak Location Through the Accessible System in Kenmore, WA

With the system pressurized, MBM technicians work through the accessible duct system to locate every specific leak point in Kenmore. Every branch takeoff. Every duct joint. Every register boot connection. Every plenum seam and air handler connection in Kenmore, WA. Every identified leak point is marked for sealing in Kenmore.

3

Correct Sealant Selected for Each Leak Point in Kenmore

Mastic sealant for most duct joint and connection applications in Kenmore, WA. UL 181-rated foil tape for specific sheet metal seam applications in Kenmore. The correct material for the specific application in Kenmore, WA.

4

Every Leak Point Sealed Completely in Kenmore, WA

MBM systematically seals every identified leak point in the accessible duct system in Kenmore. Mastic applied at the correct thickness to cover the full joint gap and bond to the duct surfaces on both sides in Kenmore, WA. Every identified leak point addressed before the post-sealing pressure test in Kenmore.

5

Post-Sealing Pressure Test to Confirm the Result in Kenmore

After all identified leak points are sealed, MBM repeats the pressure test to measure the post-sealing leakage rate in Kenmore, WA. The before and after measurements quantify the leakage reduction achieved by the sealing in Kenmore. Documented evidence of the result provided to the homeowner in Kenmore, WA.

Sealant Materials

What MBM Uses to Seal Duct Leaks in Kenmore, WA

Mastic Sealant — The Professional Standard in Kenmore

Mastic is a water-based sealant specifically formulated for duct system applications in Kenmore, WA. It remains flexible after curing, maintaining its seal through the thermal cycling that duct systems experience in Kenmore. It does not dry out, crack, or lose adhesion from temperature cycling the way standard duct tape does in Kenmore, WA.

UL 181-Rated Foil Tape for Specific Applications in Kenmore, WA

UL 181-rated foil tape is tested and rated specifically for HVAC duct applications in Kenmore. Unlike standard duct tape, it maintains its adhesion through the temperature cycling of duct system operation in Kenmore, WA. Appropriate for specific sheet metal seam applications in Kenmore.

Standard Duct Tape Is Never Used in Kenmore

Standard silver duct tape is not rated for duct system applications in Kenmore, WA. Its rubber-based adhesive dries and loses adhesion from temperature cycling in Kenmore. MBM Air Duct Cleaning never uses standard duct tape for duct sealing work in Kenmore, WA.

Why MBM

Why Choose MBM Air Duct Cleaning for Duct Sealing in Kenmore, WA

Pressure Tested Before and After — Documented Improvement in Kenmore

MBM performs pressure testing before and after every duct sealing service in Kenmore, WA. The before and after measurements document the leakage reduction achieved in Kenmore. Documented improvement, not assumed improvement in Kenmore, WA.

Every Accessible Leak Point Sealed in Kenmore, WA

MBM seals every identified leak point in the accessible duct system in Kenmore. Not a representative sample. Not the most obvious points only in Kenmore, WA. Every identified leak point in Kenmore.

Correct Materials That Maintain Effectiveness Long Term in Kenmore

Mastic sealant and UL 181-rated foil tape that maintain their effectiveness through the thermal cycling of long-term HVAC operation in Kenmore, WA. Never standard duct tape in Kenmore.

Every Sealing Service Guaranteed in Kenmore, WA

Every MBM Air Duct Cleaning duct sealing service is guaranteed in Kenmore. If the sealing does not produce the expected improvement within the guarantee period, we return and address it at no additional charge in Kenmore, WA.

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Pricing

Duct Sealing Cost in Kenmore, WA

All pricing confirmed upfront before work begins in Kenmore. No surprises in Kenmore, WA.

Small system — up to 10 vents in Kenmore$300 to $600
Standard residential system — 10 to 20 vents in Kenmore, WA$500 to $1,000
Large residential system — 20 or more vents in Kenmore$800 to $1,500+
Aeroseal treatment for inaccessible leaks in Kenmore, WA$1,500 to $3,000+

A sealing service that reduces leakage by 15 to 20 percentage points returns that proportional energy cost reduction on every subsequent energy bill in Kenmore, WA. For a home spending $200 per month on heating and cooling, a 15 percent leakage reduction saves approximately $30 per month in Kenmore. A sealing service costing $500 to $1,000 pays for itself in energy savings within 18 to 36 months in most cases in Kenmore, WA. Every month after payback is net return on the investment in Kenmore.

Pressure tested before and after. Every leak found. Correct materials. Guaranteed. MBM Air Duct Cleaning in Kenmore, WA.

Call now for same-day scheduling in Kenmore.

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Service Area

Serving Kenmore, WA and Surrounding Areas

Downtown Kenmore

Homes, condos, apartments in Kenmore, WA

North Kenmore

Full north-side coverage in Kenmore, WA

South Kenmore

All south-side communities in Kenmore

East Kenmore

East-end homes and properties in Kenmore, WA

West Kenmore

Full west-side coverage in Kenmore

Surrounding Areas

Call to confirm availability in Kenmore, WA

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FAQ

Duct Sealing FAQs in Kenmore, WA

The clearest indicators in Kenmore are energy bills that seem high relative to your usage, rooms that consistently will not reach the right temperature, an HVAC system that runs continuously without achieving comfort setpoint, higher than expected dust levels throughout the home, and humidity problems during cooling season in Kenmore, WA. Pressure testing is the definitive way to quantify the leakage in your specific system in Kenmore.
A duct pressure test connects a calibrated fan to the duct system and pressurizes it to a standard test pressure in Kenmore. The airflow required to maintain that pressure is measured in Kenmore, WA. The measured airflow represents the total leakage rate of the system in Kenmore. MBM Air Duct Cleaning performs pressure testing before and after every duct sealing service in Kenmore, WA.
The Department of Energy estimates that typical residential duct systems lose 20 to 30 percent of conditioned air through leakage before it reaches the living spaces in Kenmore. In systems with particularly poor sealing or failed original sealant, the loss can exceed 30 percent in Kenmore, WA.
Duct cleaning before duct sealing allows the mastic sealant to bond to clean duct surfaces in Kenmore. Applying mastic to duct surfaces coated with accumulated dust and debris reduces the bond quality and long-term sealing effectiveness in Kenmore, WA. MBM Air Duct Cleaning recommends cleaning before sealing when both services are needed and can coordinate both in a single visit in Kenmore.
Mastic is a water-based sealant specifically formulated for duct system applications in Kenmore. It remains flexible after curing and maintains its seal through the thermal cycling that duct systems experience during operation in Kenmore, WA. Standard duct tape uses a rubber-based adhesive that dries and loses adhesion from temperature cycling, failing within a few seasons in Kenmore.
Yes. Return duct leaks in crawl spaces draw crawl space air including its elevated moisture content into the return airstream in Kenmore. The additional moisture enters the air handler and is distributed throughout the home in Kenmore, WA. Indoor relative humidity rises despite the air conditioner running because the additional crawl space moisture load overwhelms the system's dehumidification capacity in Kenmore.
Aeroseal is a technology that seals duct leaks from inside the pressurized duct system in Kenmore. Aerosolized sealant particles are introduced into the system and travel to leak points where they accumulate and seal the gap in Kenmore, WA. It is needed when significant leakage exists in duct sections in wall cavities or ceiling plenums that cannot be physically accessed for manual sealant application in Kenmore.
Mastic duct sealant maintains its sealing effectiveness for the life of the duct system when correctly applied in Kenmore. UL 181-rated foil tape maintains adhesion for 20 years or more in normal duct system conditions in Kenmore, WA. Both materials significantly outlast standard duct tape in duct system applications in Kenmore.
Yes. Sealing the duct system reduces the conditioned air loss the system was experiencing and delivers more of the conditioned air the HVAC produces to the living spaces in Kenmore. The reduction in leakage translates directly to reduced energy consumption for the same heating and cooling output in Kenmore, WA.
Yes for systems with return duct leaks in unconditioned spaces in Kenmore. Return duct leaks in attics and crawl spaces draw unconditioned air including dust, moisture, and mold spores into the return airstream in Kenmore, WA. Sealing these leaks eliminates the pathway and keeps the circulated air to what is drawn from the living spaces in Kenmore.
Duct sealing costs in Kenmore range from $300 to $600 for smaller systems, $500 to $1,000 for standard residential systems, $800 to $1,500 and above for larger systems, and $1,500 to $3,000 and above for systems requiring Aeroseal treatment in Kenmore, WA. All pricing confirmed upfront before work begins in Kenmore.
Yes. Every MBM Air Duct Cleaning duct sealing service is guaranteed in Kenmore. If the sealing does not produce the expected improvement within the guarantee period, we return and address it at no additional charge in Kenmore, WA.
Call Today

Ducts Losing Conditioned Air? Call MBM Air Duct Cleaning in Kenmore, WA Today.

Duct leakage pays for conditioned air that heats and cools your attic and crawl space instead of your living spaces every month in Kenmore. MBM Air Duct Cleaning quantifies the leakage with pressure testing, locates every specific leak point, seals every accessible leak with correct materials, confirms the improvement with post-sealing testing, and guarantees every service in Kenmore, WA. Call now for same-day scheduling in Kenmore.

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Our HVAC & Air Duct Services in Kenmore, WA

Duct SealingHVAC RepairAir Conditioning RepairDryer Vent CleaningFurnace RepairHeat Pump RepairEmergency HVAC RepairCommercial HVAC RepairHVAC InstallationHVAC Replacement

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