Dryer Vent Cleaning, Verified: Why We Measure Airflow Before and After

Here's an uncomfortable fact about dryer vent cleaning: when it's done badly, everything looks fine. The tech shows you a handful of lint, the dryer turns on, everyone shakes hands. Whether the duct is actually clear from the dryer to the outside wall — forty feet away, through two elbows, above the garage — nobody verified at all.

That gap between "looked cleaned" and "measured clear" is why we bring an anemometer to a lint job.

What's actually at stake

Two things, one famous and one expensive:

The famous one: fire. Lint is engineered kindling — dry, fine, fluffy fuel sitting in a tube with a heating element at one end. U.S. fire departments respond to thousands of dryer fires a year, and blocked vents are the leading mechanical cause. Houston's contribution: our long vent runs. Slab-built homes here often route the duct up and across the attic — every foot and every elbow is another lint trap.

The expensive one: your time and your dryer. A restricted vent means moisture can't leave, so clothes take two cycles instead of one. That's double the electricity per load, and it cooks the dryer itself — overheating trips thermal fuses and kills heating elements years early. A dryer limping through restricted airflow is quietly the most expensive appliance in the laundry room.

The signs your vent is closing up

• Towels need a second cycle (the classic)
• The dryer's top surface or the laundry room itself gets noticeably hot mid-load
• Burning-dust smell during operation
• The outside flap barely flutters when the dryer runs — go look, it takes ten seconds
• A humid, lint-scented laundry room (that moisture belongs outdoors)

Any two of those together and the vent's overdue.

How the verified version of this job works

1. Baseline reading. Anemometer at the exterior termination, dryer on air-dry: we record the exit velocity before touching anything. Weak or near-zero flow with the drum spinning tells us how blocked we're starting.
2. Mechanical cleaning of the full run — rotary brush driven from one end, vacuum extraction at the other, every foot from the dryer connection to the outside hood. Elbows get special attention; they're where clogs anchor.
3. The bird's nest check. Exterior terminations without a proper guard are prime Houston bird real estate — we find nests a few times a month, and no amount of brushing from inside fixes a nest sitting in the hood.
4. After reading, same spot, same method. The number moves or the job isn't done. Typical result on a neglected vent: exit airflow doubles or better. You see both readings; they go on the invoice.
5. Transition hose and connection inspection behind the dryer while it's pulled out — crushed foil hoses are half a clog all by themselves, and replacing one takes minutes.

What it costs and how often

Houston-area dryer vent cleaning generally runs $100–$200 standalone, less bundled with duct cleaning (the truck's already there — ask). Frequency: annually for most households; every six months if you've got a long attic run, a big family's laundry volume, or pets whose fur rides along with every load.

It's the least glamorous service we offer and possibly the highest-stakes one per dollar. And because we measure it, it's also the one where "did it actually work?" has a number for an answer — before, after, printed, yours.