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
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Before
AfterAprilaire Duct Sealing & Repair: The Denver Owner’s Guide
CleanRun stocks and installs Aprilaire-compatible duct sealing and repair components for Denver homes, with typical installed pricing from $340 to $780 depending on the scope of the leak or damage. Most Aprilaire-specific sealing jobs are completed in a single visit because we carry the full range of Aprilaire-compatible mastic, foil tape, and collar replacements on every truck. Here is what the camera found. Here is what it costs to fix it. You decide.
Most Denver homeowners discover their Aprilaire-connected ductwork needs sealing when they notice uneven heating between floors, especially in older Capitol Hill homes where original galvanized duct runs meet newer Aprilaire zoning panels. The gap between metal and collar is often invisible from the outside until a camera shows daylight or dust blow-by at the joint.
Which Aprilaire Models This Applies To
Aprilaire’s zoning and air-cleaning systems interface with ductwork through specific collar sizes and damper connections that differ from standard HVAC fittings. The Aprilaire 6202, 6204, and 6404 zoning dampers use 6-inch, 8-inch, and 10-inch round collars respectively, and the mounting flange spacing differs from Lennox, Trane, and Carrier equivalents by roughly 3/16 inch. That gap matters when you’re sealing a retrofit installation in a Denver home where the original duct was sized for a non-zoned system.
To identify your part, check the damper body for the Aprilaire label, usually on the motor housing or the blade edge. The series number (6200, 6400, or 6500) tells us the collar diameter and motor voltage. We also stock Aprilaire-compatible universal collars for cases where the OEM part is backordered, though we always verify static-pressure ratings match the original, since Aprilaire dampers are rated for 0.5 to 1.0 inches water column in most residential applications.
CleanRun Air Duct Cleaning Denver is an independent service provider with no affiliation to Aprilaire. We source OEM and quality aftermarket equivalents based on what the job requires, and we show you both options in writing before any work starts.
Signs Your Aprilaire Duct Sealing & Repair Is Failing
- Uneven temperatures between zones. The Aprilaire damper is not seating fully against the collar, so conditioned air leaks past the blade into a zone that should be closed. In Denver’s dry climate, the rubber edge seal on older 6200-series dampers hardens and cracks after roughly 8 to 12 years of seasonal cycling.
- Dust accumulation around ceiling registers in specific zones only. This indicates negative-pressure leakage at the damper collar, pulling attic or wall-cavity debris into the duct run. We see this most often in Stapleton and Highlands Ranch homes where Aprilaire zoning was added to original single-zone systems without full duct resizing.
- Whistling or rushing air at the plenum when the system cycles. The sound comes from high-velocity air escaping through a gap between the Aprilaire collar and the main trunk line, usually where mastic has dried and separated. Denver’s altitude means air is less dense, so velocity at a given CFM is higher, making small leaks audible that might stay silent at sea level.
- Increased energy bills with no change in thermostat settings. A failed damper seal forces your furnace or heat pump to condition more volume than the zone requires. We documented a 23% runtime reduction in a Park Hill home after resealing three Aprilaire collars that had been leaking for two heating seasons.
- Visible gaps or separated tape at the damper connection. Foil tape and mastic both degrade with thermal cycling. In Denver, the 40-degree daily temperature swings common in spring and fall accelerate this fatigue, particularly where flex duct meets rigid collar.
BeforeAfterReplacement Cost & What’s Included
| Scope | Typical Range | What’s Included |
|---|---|---|
| Single collar reseal (mastic + foil tape) | $340 - $480 | Access, cleaning, sealing, photo record, 365-Day Done Right Promise |
| Single collar replacement (OEM or equivalent) | $480 - $640 | Removal, new collar, seal, balance check, photo record |
| Multiple damper / zone reseal | $640 - $780 | Full zone inspection, all collar seals, static-pressure verification, photo record |
What drives the range: accessibility (attic vs. basement), whether the original collar can be salvaged, and whether the damper motor itself is still functional. We deliver a written price before any work starts, every time, under Haven Standard Clause 1. The 365-Day Done Right Promise covers labor and materials, and the Documented Photo Record shows every collar before and after sealing.
DIY or Call Us?
There is safe checking, and there is work that belongs to a trained technician with the right access tools.
What you can safely check: verify the Aprilaire model number on the damper housing, listen for whistling during system cycles, and look for visible tape separation or mastic cracking at the collar connection. These observations help us bring the right parts on the first visit.
Where DIY goes wrong: attic ductwork in Denver homes often runs through tight truss bays with limited clearance, and the mastic application requires a clean, dry surface at temperatures above 50°F for proper curing, which is not always achievable in an unconditioned attic during winter months. More importantly, disturbing a damper collar without verifying the blade position can leave a zone fully open or fully closed, forcing the system to work against itself until the issue is caught. Our technicians carry negative-pressure extraction equipment to control debris during access, and we verify damper operation with the Aprilaire control panel before leaving.
Call (720) 799-2292 for a written estimate. Estimates are free, and we offer a Free Second Opinion on any competitor’s written quote.
FAQs
Properly applied mastic and foil tape on Aprilaire collars typically holds 10 to 15 years in Denver’s climate, though the rubber damper seal itself may need replacement at 8 to 12 years due to dry-air hardening. Attic installations with greater thermal cycling tend toward the shorter end of that range. Call (720) 799-2292 for an exact quote on your specific setup, estimates are free.
Yes, if the metal collar is intact and only the seal has failed, we can reseal with professional-grade mastic and foil tape rated for the temperature range. Replacement is necessary only when the collar is cracked, corroded, or dimensionally incompatible with the damper blade. We show you the camera footage and give you both options in writing before any work starts.
Most single-collar reseals or replacements are completed in 90 minutes to 2 hours, including access, work, testing, and photo documentation. Multi-zone jobs may extend to a half day depending on attic layout and the number of dampers involved. We schedule with a firm arrival window, not a vague “morning or afternoon” block.
We carry Aprilaire-compatible collars in 6-inch, 8-inch, and 10-inch diameters, plus the full range of mastic, foil tape, and replacement edge seals on every CleanRun truck. For less common 12-inch or rectangular Aprilaire configurations, we can typically source next-day. We confirm part availability when you call so there are no surprises.
Why Denver Homeowners Choose CleanRun for Aprilaire Work
- Written price before any work starts, every job, no exceptions, Haven Standard Clause 1
- Documented Photo Record of every duct run, before and after, included as standard
- 365-Day Done Right Promise, backed in writing, not subject to manager approval
- Background-checked, uniformed technicians operating under Haven Standard Clause 3: Verified Crews
- Professional-grade equipment from Rotobrush, Nikro, Abatement Technologies, Honeywell, Aprilaire, and Guardsman
- Free Second Opinion on any written competitor estimate
Tomas Reyes and the CleanRun crew have been handling Aprilaire-connected ductwork in Denver since 2013, including jobs in Capitol Hill where original galvanized runs and newer zoning panels create the kind of compatibility puzzles that require actual trade knowledge, not a coupon and a shop vac. We photograph every register, plenum, and main trunk line before and after, so you can see exactly what was collected and where it was sitting.
Ready for a written estimate? Call (720) 799-2292. A live person answers, and we’ll put our number next to any competitor’s quote at no cost.
Written by Tomas Reyes, Owner, CleanRun Air Duct Cleaning Denver at CleanRun Air Duct Cleaning Denver, serving Denver and nearby areas.