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Poor Airflow from Vents
in Spokane, WA
If you hold your hand near a vent and barely feel anything, the system isn't moving enough air. This can make rooms stuffy even when the AC is running. Spokane homes with older duct systems, especially those in Browne's Addition or the North Side built before 1970, often have duct problems that have gotten worse over decades. Weak airflow strains the entire system.
Quick Answer
Weak airflow usually means a dirty filter, collapsed ductwork, or a failing blower motor. In Spokane's older neighborhoods like Browne's Addition and the North Side, homes have duct systems that are 50 or 60 years old and can develop leaks or collapses. Call (509) 472-2017 to get the system checked before the problem gets worse in summer heat.
Telltale Signs
Warning Signs to Watch For
- Vents that used to push strong air now barely move a piece of paper held near them
- Some rooms are much cooler than others with no obvious reason why
- The indoor air handler sounds like it's working hard but not delivering much air
- A room addition or finished basement that never gets enough airflow
- Dust buildup around vent covers even with regular cleaning
Root Causes
What Causes Poor Airflow from Vents?
Dirty or Clogged Air Filter
A clogged filter is the most common reason for weak airflow. It chokes off the air going into the system and drops pressure throughout every duct in the house. Spokane sits in a valley that collects smoke from wildfires every summer, and that smoke loads filters with fine particles much faster than normal dust does.
The Fix
Filter Replacement and Airflow Test
Replace the filter with the correct size and MERV rating for your system. A tech can measure airflow before and after to confirm the filter was the problem and check that no other restrictions exist.
Collapsed or Disconnected Ductwork
Flexible duct used in many Spokane homes built in the 1980s can collapse, kink, or come apart at the seams over time. When a section collapses, air can't get through and the whole branch of the duct system loses pressure. Attic ducts are especially prone to this because attic temperatures in summer can hit 140 degrees, which softens the flex duct over years.
The Fix
Duct Inspection, Repair, or Replacement
A tech inspects accessible duct runs and uses pressure testing to find blockages in hidden sections. Collapsed sections are replaced with new flex duct or rigid metal duct depending on the location.
Failing Blower Motor
The blower motor inside the air handler is what pushes air through the entire duct system. As a motor wears out, it slows down and can't move the volume of air the system was designed for. Blower motors in systems that are 15 or more years old are close to the end of their typical service life.
The Fix
Blower Motor Testing and Replacement
A tech measures the motor's amp draw and RPM to confirm it's underperforming. Replacing the motor restores proper airflow as long as the duct system is clear.
Self-Diagnosis
Which Cause Applies to You?
Check the signs you're observing to narrow down the likely root cause before your inspection.
| What You're Seeing | Dirty or Clogged Air Filter | Collapsed or Disconnected Ductwork | Failing Blower Motor |
|---|---|---|---|
| Filter is completely gray and clogged when removed | |||
| One wing of the house has almost no airflow but the other side is fine | |||
| Weak airflow from every single vent in the house equally | |||
| Airflow dropped off over a few weeks during wildfire smoke season | |||
| Airflow problem started after someone worked in the attic | |||
| Blower runs but sounds labored and slower than normal |
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