Duct Sealing Service Miramar, FL

Professional Duct Sealing Services in Miramar, FL

A duct system with many small leaks can lose as much air as one with a large gap. Our techs seal every accessible joint and seam in the system. First, we pressurize the duct system to locate where air is escaping. We work around your schedule so your home or business isn't disrupted. Next, we apply mastic sealant to open seams and joints so they're airtight. We give extra attention to connections at the trunk line, where leaks affect every branch. After sealing, we run a second leakage test to confirm the results. You'll find the specific duct sealing services we provide below.

Duct Leakage Testing in Miramar

Duct leaks rarely show themselves, so the only reliable way to know how much air a system loses is to measure it. Our team seals off every supply register and return grille with temporary covers, then connects a calibrated duct leakage tester to the return. The tester pressurizes the ducts to a standard test pressure and reads how much air escapes in cubic feet per minute. A smoke machine or smoke pencil then shows exactly where air leaves the system at joints, boots, and plenums. When the test reveals a leak that has separated beyond a simple seal, we also complete air duct repair at that location before the sealing crew moves on. We mark each leak location on a duct layout for the sealing crew. You get a leakage number, a leak map, and a clear picture of what the system loses.

HVAC Duct Sealing in Miramar

The connections at the air handler cabinet move the most air under the highest pressure, so small gaps there leak more air than gaps farther down the line. Miramar Air Duct Cleaning Pro seals the joints where the supply and return plenums meet the air handler, along with the cabinet panels and the filter slot. Gaps at the plenum flanges get a coat of mastic reinforced with fiberglass mesh, and cabinet seams get foil tape rated for HVAC use. When a plenum section is rusted or crushed beyond sealing, we also complete air duct replacement on that section before the new seal goes on. Unused openings and old refrigerant line holes in the cabinet get plugged and sealed. The filter slot gets a sealed cover so the system stops pulling in unfiltered air. The air handler pushes all its air into the ducts, and the coil stays cleaner.

Air Duct Leak Sealing in Miramar

Leaks found during testing often cluster at a few bad spots, such as a split takeoff, a loose collar, or a torn flex jacket. Our pros go straight to the leaks marked on the leak map and confirm each one with a smoke pencil before sealing. Loose collars and takeoffs get screwed tight and covered with mastic, and torn sections get cut out and replaced. Larger gaps get fiberglass mesh tape embedded in the mastic so the seal does not crack as the duct moves. If the leak sits at a joint where the duct material itself has failed, we can also complete air duct leak repair as part of the same seal. A quick smoke check after each repair confirms the leak has stopped. Air reaches the rooms it was meant for, and weak rooms gain airflow.

Mastic Seam Sealing in Miramar

Cloth duct tape on older systems loses its grip in attic heat, and every seam it covers slowly opens as the adhesive fails. Our crew walks each accessible duct run in the attic or crawl space and strips failed tape from seams and joints. Each seam gets wiped clean so the sealant bonds to bare metal or duct jacket. We brush on a thick layer of water-based duct mastic that stays flexible after curing and holds through temperature swings. Joints wider than a quarter inch get mesh tape embedded in the mastic.  When the duct behind the seam shows heavy dust from years of leaking air, we can add HVAC duct cleaning to the same visit so the repaired system starts clean. The sealed seams last for years, and the duct system holds pressure at every joint.

Aerosol Duct Sealing in Miramar

Some leaks sit inside walls, under floors, or in duct sections that no one can reach without tearing out drywall. We seal those hidden leaks from the inside by blowing an aerosolized sealant through the pressurized duct system. Before starting, the crew blocks every register and covers the air handler and coil to protect them. Sealant particles travel with the air and stick to the edges of each leak until the gap closes, while a computer tracks leakage in real time. The process stops once the system reaches the target leakage number. You get a sealed system and a printed report showing leakage before and after, without opening any walls.

Return Plenum Sealing in Miramar

Return plenums built into closet platforms or wall cavities often have open framing joints that pull in attic, garage, or wall air. Our team removes the return grille and inspects the plenum interior for gaps, raw drywall edges, and holes for wiring or pipes. We seal every joint and penetration with mastic and fire-rated foam, and cover rough surfaces with duct board or sheet metal where air contacts them. When the existing return grille is warped or broken and no longer fits the opening, we install air vent replacement during the same visit. The plenum floor gets sealed where it meets the air handler stand. A pressure test confirms the return now pulls air only through the grille. Humid attic air stops entering the system, and the air inside your home stays cleaner.

Register Boot Sealing in Miramar

The gap between a register boot and the ceiling or floor lets air from the attic or crawl space leak straight into the room, often leaving dark dust streaks around the vent. Miramar Air Duct Cleaning Pro removes each register and inspects the boot edge and the seam where the boot meets the branch duct. Gaps against the drywall get sealed with mastic or fire-rated caulk, and the boot-to-duct seam gets sealed from the attic side. Insulation around the boot gets restored so the metal does not sweat. Registers go back on with foam gaskets that close the last small gap. Dust streaks stop forming, and less attic heat reaches each room.

Attic Duct Sealing and Insulation in Miramar

Sealed ducts still lose cooling in a hot attic when their insulation is thin, torn, or missing. Our crew seals each attic run first, then checks the insulation for compression, gaps, and water damage. Damaged sections get wrapped with new foil-faced duct insulation, and every seam in the vapor barrier gets taped with UL 181 foil tape. Runs resting directly on the attic floor get lifted on straps so the insulation keeps its full thickness. When the attic also holds a bathroom exhaust duct running beside the HVAC runs, we can perform bathroom exhaust duct cleaning on that line during the same visit. We also seal the duct penetrations through the ceiling so conditioned air stays below the attic floor. A thermal camera scan confirms no bare spots remain. Air leaves the vents colder, and the ducts stop sweating onto the ceiling.

Duct Sealing Near Me in Miramar, FL

Homeowners looking for local duct sealing want a crew that tests first and shows proof of the result. Miramar Air Duct Cleaning Pro serves Miramar and nearby areas including Silver Shores, Riviera Isles, Sunset Lakes, Harbour Lake Estates, Windsor Palms, and Monarch Lakes. with leakage testing and sealing for homes, condos, and businesses. Call (954) 872-0071 to schedule a duct leakage test.