Commercial PIU Cleaning in Atlanta

Cleaning of powered induction units (PIU) and fan-powered terminal boxes — the fan-driven terminals that mix and deliver air to perimeter and interior zones.

A powered induction unit (PIU), or fan-powered terminal box, uses a small built-in fan to draw plenum air and mix it with primary supply air before delivering it to a zone. That constantly running fan also constantly pulls dust, lint and debris into the box, onto its filter and across its coil — making PIUs one of the dirtiest, most overlooked terminals in a commercial system.

Atlanta Air Experts cleans commercial PIUs — fan, motor, coil, filter and box interior — so the terminal moves clean air quietly and efficiently instead of recirculating dust into the zone.

What a PIU Cleaning Covers

⟳

Fan & Motor

Dust-loaded fan wheels lose airflow and get loud. We clean the wheel, housing and motor compartment.

❄

Coil

We clean the unit’s heating/cooling coil to restore capacity and stop musty odors at the terminal.

🧮

Filter

The terminal filter is replaced or cleaned and the rack checked for bypass.

📦

Box Interior & Liner

Interior surfaces and liner are HEPA-cleaned and inspected for dust loading and mold.

⚙

Damper & Controls

We clean the primary-air damper and confirm the unit responds to its controls.

💧

Microbial Treatment

Where mold or biofilm is found we apply an EPA-registered antimicrobial labeled for HVAC use.

Our PIU Cleaning Process

Locate & Access

We identify the PIUs serving each zone and open code-compliant access above the ceiling.

Containment

The terminal is isolated under HEPA-filtered negative pressure so debris is captured at the source.

Clean Fan, Coil & Box

Fan wheel, motor, coil, filter and interior are cleaned with tools suited to tight fan-powered terminals.

Antimicrobial (as needed)

Mold or biofilm is treated with an EPA-registered antimicrobial labeled for HVAC use.

Test & Document

We confirm the fan runs quietly and the zone responds, then document each unit.

Why PIU Cleaning Matters

A fan that never stops collecting dust. Because a PIU continuously pulls and recirculates plenum air, it loads up with dust and can become a mold reservoir — then blows that into the zone. Cleaning it removes a hidden, ongoing source of poor air quality.

Quiet, efficient comfort. A clogged PIU fan gets loud, loses airflow, and makes the zone uncomfortable. Cleaning restores quiet operation, proper airflow and zone control.

PIU cleaning belongs in a full commercial air duct cleaning program for the building. Standards: NADCA ACR Standard.

Signs Your PIUs Need Cleaning

Loud or rattling terminalsWeak airflow in a zoneMusty smell near ceilingsDust around supply outletsZones that won’t hold tempAllergy complaints in an areaYears since last service

Frequently Asked Questions

What is a PIU and how is it different from a VAV box?A PIU (powered induction unit) is a fan-powered terminal box: it has its own small fan that mixes plenum air with primary supply air. A standard VAV box has no fan. That built-in fan makes PIUs collect dust faster and run louder when dirty, so they especially benefit from regular cleaning.

Can you clean PIUs while we’re occupied?Yes. We work terminal-by-terminal above the ceiling under containment, so the rest of the floor keeps operating. We schedule noisier work around your hours when needed.

Will cleaning make the terminal quieter?Usually, yes. A lot of PIU noise comes from a dust-loaded fan wheel that’s out of balance. Cleaning the wheel and housing typically restores quiet, efficient airflow.

Get a Free Commercial PIU Cleaning Quote

Serving Atlanta-metro offices, healthcare and multi-zone commercial buildings. Detailed terminal-unit work, documented, low disruption.

Request Your Free Quote

Request Service in Atlanta

Tell us about your facility — we will get right back to you.