Whole-system duct and dryer vent check with before-and-after photos - you see exactly what came out of your vents
That "$99 whole-house special" is a bait ad - the real number appears once they are in your hallway, or the "clean" is a shop-vac at the register. We photograph the inside of your ducts before and after instead.
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Before
AfterAprilaire Duct Repair & Sealing in Washington: What to Know First
CleanRun Duct Repair & Cleaning provides independent Aprilaire duct repair and sealing in Washington, DC, with most repairs scheduled within two business days and completed in a single visit. We deliver a written price before any work begins, and every job ends with a documented photo record of every duct run we touched. If you own an Aprilaire air cleaner, humidifier, or ventilation system and you’re seeing uneven airflow, rising energy bills, or dust that returns after cleaning, the problem is often in the duct connections, not the unit itself. Call (240) 363-3380 for a free estimate with no obligation to book.
How Aprilaire Products Fail - and How We Fix Them
- Model 5000/6000 Series Electronic Air Cleaners - Loose Plenum Connections: These units mount directly to the return plenum (the main duct trunk that feeds your furnace), and the sheet metal adapter can work loose after seasonal thermal cycling. In Washington’s humid summers and dry-heated winters, expansion and contraction loosen the seal between the cleaner cabinet and the plenum collar. We remove the unit, inspect the adapter for cracks, and reseat it with mastic sealant (a thick, brush-applied paste that hardens into a permanent flexible seal) rather than foil tape, which fails within two years in this climate.
- Model 800 Steam Humidifiers - Duct Wall Heat Damage: The 800 series generates steam inside a canister that mounts to the supply duct. When the distribution tube seal degrades, hot steam escapes into the surrounding duct wall, warping flex duct or delaminating the inner liner of insulated flex runs. We’ve replaced dozens of these in Capitol Hill rowhouses where the original installer used standard flex duct within 18 inches of the humidifier. We replace damaged sections with fiberglass-lined metal duct and install a high-temperature silicone gasket at the distribution tube.
- Model 8126X Ventilation Systems - Backdraft Damper Sticking: These whole-house ventilators rely on a backdraft damper (a hinged flap that opens when the fan runs and closes when it stops) to prevent unconditioned air from entering. In Washington, pollen and urban particulate cause the damper to stick partially open, creating a continuous leak path. The symptom is a house that won’t hold temperature in shoulder seasons. We clean the damper pivot, replace the blade if warped, and seal the mounting flange with closed-cell foam tape rated for duct pressure.
- Model 400/500 Humidifiers - Bypass Duct Sagging: These bypass units use a 6-inch round duct to divert warm air across the humidifier pad. The flexible duct commonly used for this connection sags over time, creating a low point where condensate collects and mold grows. In older Washington homes with basement mechanical rooms, we’ve found sagging bypass ducts that were 40% blocked by biomass. We replace flex with solid pipe where possible, or support flex with proper hangers pitched toward the drain.
- Model 700 Power Humidifiers - Supply Duct Pressure Imbalance: The 700 series draws from the return and blows into the supply, creating a positive pressure zone that can force conditioned air out through existing leaks. If your ductwork already has loose register boots (the metal collar where the duct meets the floor or ceiling vent) or disconnected flex joints, the 700 will accelerate leakage. Our camera inspection identifies these pre-existing leaks before the humidifier amplifies them. We seal with mastic and mechanical fasteners, not tape.
Our Aprilaire Duct Repair & Sealing Process
- 1
Written estimate delivered on arrival. Our technician inspects the Aprilaire unit and accessible ductwork, photographs any damage, and provides a written price before removing a single panel. Haven Standard Clause 1: No work begins without a signed written price.
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Camera inspection of every duct run. We run a borescope (a flexible camera on a cable) through the connected ductwork to document the full condition, not just what’s visible at the unit. The customer sees the footage in real time.
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Parts decision: OEM or verified aftermarket. For Aprilaire-specific components like distribution tubes, gaskets, and backdraft dampers, we stock OEM parts. For generic duct materials - metal pipe, flex duct, mastic - we use trade-grade equivalents from Abatement Technologies and Guardsman that meet or exceed OEM specifications. We note the source on the written scope.
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Repair and seal. We replace damaged sections, reseat connections, and apply mastic with a brush and mesh reinforcement at stress points. Every joint is mechanically secured before sealing.
- 5
Pressure test and airflow verification. We verify static pressure at the unit and temperature rise across the heat exchanger to confirm the repair hasn’t introduced restriction.
- 6
Documented photo record delivered. Before-and-after images of every duct run, plus the written scope and the 365-Day Done Right Promise, are emailed to the customer before the technician leaves. Show the before photo first. Everything else follows from that.
BeforeAfterWhat Aprilaire Duct Repair & Sealing Costs in Washington
| Repair Type | Typical Range | What Affects Price |
|---|---|---|
| Plenum reseal (Model 5000/6000) | $340 - $520 | Accessibility, adapter replacement needed |
| Bypass duct replacement (Model 400/500) | $280 - $450 | Length of run, solid vs. flex pipe |
| Backdraft damper service (8126X) | $220 - $380 | Damper replacement vs. cleaning only |
| Humidifier heat damage repair (800 series) | $480 - $760 | Extent of duct wall damage, liner replacement |
| Full supply/return leak seal with Aprilaire unit reseat | $890 - $1,400 | Number of registers, duct accessibility |
These are whole-system prices, not per-vent teaser rates. The written price we deliver includes all labor, materials, and the documented photo record. No additional charges appear after work begins. Call (240) 363-3380 for an exact quote - estimates are free.
Why Washington Homeowners Call CleanRun Air Duct Cleaning Washington for Aprilaire Work
We’ve been in Washington homes since 2013, and Aprilaire equipment shows up frequently in the 20001-20016 zip codes where builders specified whole-house air quality systems during the 2015-2022 construction boom. Tomas Reyes, our owner, has handled enough gravity-fed return systems in Capitol Hill Victorians and undersized flex runs in Dupont Circle condos that he can usually diagnose the duct configuration from the basement stairs.
Our crew also services Lennox, Trane, and Carrier integrated systems, so when your Aprilaire unit is tied to a multi-brand HVAC setup, we don’t need to call in a second contractor. Every technician is background-checked and uniformed under Haven Standard Clause 3: Verified Crews. The 365-Day Done Right Promise is backed in writing on every job, not stated in marketing copy and forgotten.
FAQs
No. As an independent Aprilaire service provider, we use OEM parts where required and document our work so warranty claims remain valid. Aprilaire’s warranty covers defects in the unit itself; our repairs address the duct connections, which are outside the unit and not covered by manufacturer warranty in any case. If you have an active warranty claim on the unit, we’ll note our work in writing so there’s no confusion about what was touched. Call (240) 363-3380 if you need help navigating a warranty issue alongside repair work.
Most single-component repairs - a plenum reseal, bypass duct replacement, or backdraft damper service - are completed in two to four hours. Full-system leak sealing with multiple register boots takes a full day. We schedule accordingly and do not rush the pressure test at the end. You’ll know the time estimate in writing before we start.
Replace the unit if it’s more than 12 years old and the repair cost exceeds 40% of a new equivalent. Repair if the unit is functional and the issue is isolated to duct connections, which is the case for roughly 70% of the Aprilaire calls we see in Washington. We will tell you directly if replacement is the better option; we do not gain from selling you equipment we don’t stock.
We stock common Aprilaire duct interface parts - plenum adapters, distribution tubes, backdraft dampers, gaskets - for the 400, 500, 700, 800, 5000, 6000, and 8126X series. Specialty items for discontinued models ship in two to three business days. We verify parts availability before confirming your appointment so we’re not occupying your morning waiting on a delivery.
You receive a documented photo record of every duct run, before and after, as a standard deliverable on every job. The images are timestamped and geotagged. We also provide the written scope with technician name, materials used, and pressure test results. If you want to verify independently, hold a smoke pencil near the sealed joints - a tool we’ll demonstrate on request before we leave. Call (240) 363-3380 to schedule.
Written by Tomas Reyes, Owner & Lead Technician, CleanRun Air Duct Cleaning Washington at CleanRun Air Duct Cleaning Washington, serving Washington and nearby areas.