The Original Low-voltage UV Light Kit

Blue-Tube UV is the single most popular germicidal UV light product for HVAC systems in the world. Home owners breathe easy knowing that the air their family breathes is protected by this proven technology. Blue-Tube UV is the simple, safe, and effective way to keep your air system clean and improve indoor air quality.

Blue-Tube UV in air handler

What Blue-Tube Does

Award-Winning Design

Blue-Tube UV features a number of patented innovations from Fresh-Aire UV. The original low-voltage UV light kit for HVAC has been updated to include a magnetic mounting bracket and now has a 110-277 VAC high-voltage power supply option. Choose one or two year lamps.

No Worries!

We are so confident in the quality of our design and manufacturing that this product comes with a lifetime warranty on all parts except the UV lamp (which needs to be replaced every one or two years depending on model).

Blue-Tube UV
Blue-Tube UV package

Central AC System with Blue-Tube UV light installed

Fresh-Aire UV lifetime warranty


Coils with Mold

UV light keeps coils clean

Mold thrives on AC coils
UV light keeps coils clean

Clean Coils

Mold thrives in the cool, moist interior of the central air system. Blue-Tube UV is proven effective at sterilizing mold and other biological contaminants. Moldy coils shorten the life of the air system and waste energy by reducing efficiency. Blue-Tube UV kills the mold and reduces the need for system maintenance.

Indoor Air Quality

According to the EPA indoor air pollution is often five times worse than outdoor and represents a significant health risk. Blue-Tube UV improves indoor air quality by sterilizing mold, bacteria, viruses, and allergens from the air as it cycles through the central air system.

Indoor air quality has a profound effects on respiratory health.

How Blue-Tube Works

UV light scrambles microbial DNA

Germ-Killing Power of UV-C Light

For over a century scientists have known about the germ-killing properties of UV-C light. Because this frequency of light is filtered out by the Earth's atmosphere microorganisms have no defense against it. It works by scrambling their DNA which prevents them from reproducing.

DNA Scramble

UV-C light works by penetrating the cell walls of microorganisms and scrambling their DNA. This prevents them from reproducing.

UV effectiveness chart

UV-C light kills nearly all biological contaminants including:









Blue-Tube UV Models

Blue-Tube UV "ER", "ST" models

Blue-Tube UV is available with two power supply options: ER models are low-voltage 18-32 VAC and ST models are line-voltage 120-277 VAC. Both support one or two year Fresh-Aire UV lamps.


Note: one and two year Fresh-Aire UV lamps are interchangeable.


Blue-Tube UV package