Apartments in Montrose take a beating. Units turn over, tenants bring pets, windows stay cracked during the few cool weeks we get, and the AC runs nearly every day the rest of the year. All of that ends up in the ductwork. When a property manager asked us to clean the air ducts in a unit near the Montrose and Midtown line in 77006, we expected some dust. What we found was a lot more than that.
This unit has a ductboard system, and that changes how the job has to be done. Below is what the ducts looked like, how we cleaned them without damaging them, and what the place looked like when we left.
What Is Ductboard, and Why It Matters
Many Houston apartments and condos built in the 1980s and 1990s use ductboard (also called fiberboard) instead of sheet metal. It’s a rigid panel made of compressed fiberglass with a foil facing on the outside. The inside surface, the part the air touches, is bare fiberglass with a rough, textured face.
That texture is the problem. Dust doesn’t slide off ductboard the way it does off smooth metal. It settles into the surface and builds up in layers. And because the inner face is soft, you can’t attack it with a spinning rotary brush the way you would a metal trunk line. A brush tears up the fiberglass and blows loose fibers into the living space. A crew that brushes ductboard can leave a system worse than they found it.
What We Found Inside the Ducts
The first look inside the supply duct told the story. A thick gray layer covered the bottom of the run, cracked like dried mud in places, with clumps of debris sitting on top.
Further down the line, loose chunks of debris had collected on the duct floor. Some of it was construction leftovers from years back. Most of it was ordinary household dust that had been circulating and settling, over and over, every time the system kicked on.
This close-up shows how deep the buildup had gotten. The duct floor was completely covered, and the walls had the same coating. All of this sits right in the airflow path, so every cycle of the AC pulls some of it loose and pushes it out through the vents.
The main trunk line had the same problem. You can see the ductboard texture under the dust, along with loose bits hanging off the seams and edges.
At the boot connection, where a branch line meets a register, debris had piled up at the transition. These connection points tend to catch more than the straight runs because the air slows down and changes direction there.
The Vent Covers
The return air grille was coated in dark buildup along every slat. Return grilles pull air from the room into the system, so they collect whatever is floating around: dust, pet hair, lint and cooking residue.
The supply registers weren’t much better. Dark streaks along the louvers are a common sign that dust is moving through the system and landing on the way out.
How We Cleaned a Ductboard System
Because this was ductboard, we used the method that cleans it without tearing it apart:
- Air washing. We ran compressed air through each run with an air-whip tool that knocks dust loose from the ductboard surface without scraping the fiberglass.
- Negative-pressure HEPA collection. A high-powered HEPA vacuum held the system under negative pressure the whole time, so everything we knocked loose was pulled out of the ducts instead of blown into the apartment.
- HEPA contact vacuuming. Where we could reach, we vacuumed the duct surfaces directly with HEPA-filtered tools to pick up what the air wash loosened.
- Supply and return lines. We cleaned every supply run and the return side, including the trunk line and each boot connection.
- Vent covers. We pulled every register and grille, washed them, and reinstalled them.
- Sealing. We sealed the connections at the registers to cut down on air leaks around the openings.
- Antimicrobial treatment and deodorizing. After cleaning, we applied an antimicrobial treatment to the supply and return ducts and deodorized the system.
The Results
Here’s the same supply duct after cleaning. The thick gray layer is gone, and you can see the ductboard surface again. The texture is intact, with no shredding and no loose fibers, which is exactly what you want.
Another view down the cleaned supply line. The duct floor is clear all the way back.
The trunk line, cleaned. Compare it with the earlier photo of the same section and the difference is obvious.
The supply registers came out of the wash looking close to new, with the dark streaking gone from the louvers.
The return grille, washed and ready to go back on the wall.
Why This Matters for Apartments and Condos
In multi-family buildings, ducts often go years without anyone looking inside. Tenants change filters (sometimes), but filters only catch what passes through them. Everything already inside the ductwork stays there until someone cleans it out.
For property managers, clean ducts help in a few practical ways. Units show better during turnover, there are fewer complaints about dusty rooms or musty smells, and the AC isn’t fighting extra restriction in the ductwork. For residents, it means the air coming out of the vents isn’t carrying years of someone else’s dust.
A few signs a unit is due for duct cleaning:
- Dust shows up on furniture a day or two after cleaning
- Dark streaks on the vent covers
- A musty smell when the AC first turns on
- A new tenant moving in, especially after a long previous lease or pets
- It’s been more than three to five years, or nobody knows when it was last done
Air Duct Cleaning in Montrose and Across Houston
We clean air ducts in apartments, condos and homes across Montrose, Midtown, the Museum District, the Heights and the rest of Houston. We work with property managers on single units and full buildings, and we know how to handle ductboard, flex duct and sheet metal systems without damaging them.
If you manage a property or rent a unit and the ducts haven’t been touched in years, see how our air duct cleaning works or book an appointment online. You can also call us at (832) 699-0888 for a free estimate.