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

Duct Sealing in Kensington, MD —
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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 Kensington, MD

Your energy bills are higher than they should be for the amount of heating and cooling your home requires in Kensington. Certain rooms will not reach the right temperature regardless of how long the HVAC runs in Kensington, MD. You have had the equipment checked and it is working correctly in Kensington. 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 Kensington, MD. 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 Kensington.

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 Kensington, MD. The Department of Energy estimates that typical residential duct systems lose 20 to 30 percent of conditioned air through leakage in Kensington. 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 Kensington, MD.

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

Why Correct Sealant Materials Last While Duct Tape Fails in Kensington, MD

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 Kensington. A supply duct carrying cold conditioned air through a 130-degree summer attic cycles through extreme temperatures with every cooling cycle in Kensington, MD. Standard duct tape adhesive is not formulated for this cycling and fails within a few seasons in Kensington. Mastic sealant remains flexible after curing and maintains its seal through years of thermal cycling in Kensington, MD. UL 181-rated foil tape maintains adhesion for 20 years or more in normal duct system conditions in Kensington.

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Where Leaks Occur

Where Duct Leaks Occur and Why They Develop in Kensington, MD

At Every Unsealed Duct Joint Throughout the System in Kensington

Every connection between duct sections is a potential leak point in Kensington, MD. In most residential installations, these joints were mechanically fastened without sealant during installation in Kensington. 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 Kensington, MD.

At Branch Takeoffs From the Main Trunk Line in Kensington, MD

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

At Register Boot Connections in Walls and Ceilings in Kensington

The register boot connects the branch duct run to the wall, ceiling, or floor opening where the supply register mounts in Kensington, MD. 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 Kensington. Conditioned air escaping at the boot level leaks into the wall or ceiling cavity rather than through the register into the room in Kensington, MD.

Why Original Installation Sealant Fails Over Time in Kensington, MD

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

What Leakage Costs You

What Duct Leakage Costs You in Kensington, MD

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 Kensington, MD

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 Kensington. The conditioned air that leaks out before reaching the register does not reach the room in Kensington, MD. Rooms at the end of long duct runs with multiple leak points along the way receive the cumulative effect of all those leaks in Kensington. 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 Kensington, MD.

What Return Duct Leaks Do to Your Indoor Air Quality in Kensington, MD

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

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Our Sealing Process

MBM's Duct Sealing Process in Kensington, MD

1

Pressure Testing to Establish Total Leakage in Kensington

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

2

Systematic Leak Location Through the Accessible System in Kensington, MD

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

3

Correct Sealant Selected for Each Leak Point in Kensington

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

4

Every Leak Point Sealed Completely in Kensington, MD

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

5

Post-Sealing Pressure Test to Confirm the Result in Kensington

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

Sealant Materials

What MBM Uses to Seal Duct Leaks in Kensington, MD

Mastic Sealant — The Professional Standard in Kensington

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

UL 181-Rated Foil Tape for Specific Applications in Kensington, MD

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

Standard Duct Tape Is Never Used in Kensington

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

Why MBM

Why Choose MBM Air Duct Cleaning for Duct Sealing in Kensington, MD

Pressure Tested Before and After — Documented Improvement in Kensington

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

Every Accessible Leak Point Sealed in Kensington, MD

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

Correct Materials That Maintain Effectiveness Long Term in Kensington

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

Every Sealing Service Guaranteed in Kensington, MD

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

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Pricing

Duct Sealing Cost in Kensington, MD

All pricing confirmed upfront before work begins in Kensington. No surprises in Kensington, MD.

Small system — up to 10 vents in Kensington$300 to $600
Standard residential system — 10 to 20 vents in Kensington, MD$500 to $1,000
Large residential system — 20 or more vents in Kensington$800 to $1,500+
Aeroseal treatment for inaccessible leaks in Kensington, MD$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 Kensington, MD. For a home spending $200 per month on heating and cooling, a 15 percent leakage reduction saves approximately $30 per month in Kensington. A sealing service costing $500 to $1,000 pays for itself in energy savings within 18 to 36 months in most cases in Kensington, MD. Every month after payback is net return on the investment in Kensington.

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

Call now for same-day scheduling in Kensington.

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Service Area

Serving Kensington, MD and Surrounding Areas

Downtown Kensington

Homes, condos, apartments in Kensington, MD

North Kensington

Full north-side coverage in Kensington, MD

South Kensington

All south-side communities in Kensington

East Kensington

East-end homes and properties in Kensington, MD

West Kensington

Full west-side coverage in Kensington

Surrounding Areas

Call to confirm availability in Kensington, MD

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FAQ

Duct Sealing FAQs in Kensington, MD

The clearest indicators in Kensington 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 Kensington, MD. Pressure testing is the definitive way to quantify the leakage in your specific system in Kensington.
A duct pressure test connects a calibrated fan to the duct system and pressurizes it to a standard test pressure in Kensington. The airflow required to maintain that pressure is measured in Kensington, MD. The measured airflow represents the total leakage rate of the system in Kensington. MBM Air Duct Cleaning performs pressure testing before and after every duct sealing service in Kensington, MD.
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 Kensington. In systems with particularly poor sealing or failed original sealant, the loss can exceed 30 percent in Kensington, MD.
Duct cleaning before duct sealing allows the mastic sealant to bond to clean duct surfaces in Kensington. Applying mastic to duct surfaces coated with accumulated dust and debris reduces the bond quality and long-term sealing effectiveness in Kensington, MD. MBM Air Duct Cleaning recommends cleaning before sealing when both services are needed and can coordinate both in a single visit in Kensington.
Mastic is a water-based sealant specifically formulated for duct system applications in Kensington. It remains flexible after curing and maintains its seal through the thermal cycling that duct systems experience during operation in Kensington, MD. Standard duct tape uses a rubber-based adhesive that dries and loses adhesion from temperature cycling, failing within a few seasons in Kensington.
Yes. Return duct leaks in crawl spaces draw crawl space air including its elevated moisture content into the return airstream in Kensington. The additional moisture enters the air handler and is distributed throughout the home in Kensington, MD. Indoor relative humidity rises despite the air conditioner running because the additional crawl space moisture load overwhelms the system's dehumidification capacity in Kensington.
Aeroseal is a technology that seals duct leaks from inside the pressurized duct system in Kensington. Aerosolized sealant particles are introduced into the system and travel to leak points where they accumulate and seal the gap in Kensington, MD. 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 Kensington.
Mastic duct sealant maintains its sealing effectiveness for the life of the duct system when correctly applied in Kensington. UL 181-rated foil tape maintains adhesion for 20 years or more in normal duct system conditions in Kensington, MD. Both materials significantly outlast standard duct tape in duct system applications in Kensington.
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 Kensington. The reduction in leakage translates directly to reduced energy consumption for the same heating and cooling output in Kensington, MD.
Yes for systems with return duct leaks in unconditioned spaces in Kensington. Return duct leaks in attics and crawl spaces draw unconditioned air including dust, moisture, and mold spores into the return airstream in Kensington, MD. Sealing these leaks eliminates the pathway and keeps the circulated air to what is drawn from the living spaces in Kensington.
Duct sealing costs in Kensington 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 Kensington, MD. All pricing confirmed upfront before work begins in Kensington.
Yes. Every MBM Air Duct Cleaning duct sealing service is guaranteed in Kensington. If the sealing does not produce the expected improvement within the guarantee period, we return and address it at no additional charge in Kensington, MD.
Call Today

Ducts Losing Conditioned Air? Call MBM Air Duct Cleaning in Kensington, MD Today.

Duct leakage pays for conditioned air that heats and cools your attic and crawl space instead of your living spaces every month in Kensington. 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 Kensington, MD. Call now for same-day scheduling in Kensington.

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Our HVAC & Air Duct Services in Kensington, MD

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

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