A&J has been in the duct cleaning industry for over 20 years. We serve residential, commercial, industrial, restaurant clients and property management companies or contractors.
A&J Duct Cleaning — Over 20 years
Ductwork Encapsulation
Ductwork Encapsulation
Ductwork encapsulation seals fiberglass duct lining so that it stops releasing fibers into the air moving through the system. On commercial rooftop ductwork the insulation is fiberglass, and once the cleaning is done we encapsulate that area. In older homes the fiberglass on the inside of the ductwork can deteriorate with age until it becomes friable, and at that point you have two choices: replace the ductwork or encapsulate it. We will look at what you have and tell you honestly which one it needs.

A&J Duct Cleaning
Service detail
What Ductwork Encapsulation Is
Encapsulation seals the fiberglass lining inside a duct run so the fibers stay bound in place rather than breaking loose and traveling through the system with the air.
It is not an alternative to cleaning. The ductwork is cleaned first and the encapsulation goes on afterwards, because sealing a dirty run simply encloses whatever is already in it.
Why We Do It: Fiberglass
Fiberglass is what the insulation in most ductwork is made of. Intact, properly installed and well maintained, it is not a problem. Damaged, aged or deteriorated, it is a different matter.
Commercial rooftop ductwork is lined with fiberglass, and encapsulating it once the cleaning is finished is what keeps that lining from breaking down again. The other case is older residential homes, where fiberglass on the interior of the ductwork has aged to the point of becoming friable.
Friable and Non-Friable Fiberglass
The difference between the two is what decides whether the lining is a problem:
- Friable fiberglass has fibers that are not tightly bound, so minimal pressure breaks them into smaller particles or dust
- Fiberglass becomes friable through damage, age or deterioration, and sometimes from being improperly installed in the first place
- Non-friable fiberglass is bonded with resins, cement or other binders, so the fibers are not easily released unless the material is cut, drilled or otherwise damaged
- Intact, well maintained fiberglass duct lining is unlikely to release fibers at all
- Friable lining inside a working air system is the concern, because every time the system runs it can carry fibers into the rooms
Why Friable Fiberglass Matters for Your Health
When fiberglass in ductwork is damaged, aged or disturbed, fine glass fibers can become airborne and circulate through the building. Breathing them in, or getting them on your skin or in your eyes, can irritate the eyes, nose, throat and skin, causing itching, coughing, wheezing or a sore throat. Higher levels can aggravate asthma or bronchitis.
Dusty vents, visible fibers around the registers, and allergy or breathing symptoms that are worse indoors than out are all worth having looked at.
Replace It or Encapsulate It
Once the lining has gone friable there are two ways forward: replace the ductwork, or encapsulate what is already there. On commercial rooftop runs encapsulation is the normal step once the cleaning is finished.
We are honest about every project. If we look at your ductwork and think replacement is the right answer rather than encapsulation, we will tell you that.
Ask About Ductwork Encapsulation
A&J is licensed and insured and holds Contractors LIC #1124619, with over 20 years in the duct cleaning industry. Encapsulation is run out of our main Los Angeles branch.
We take before and after pictures on every job, which matters here because the work is inside the ductwork where you are never going to see it yourself.
A&J Duct Cleaning — Over 20 years
What sets us apart
What sets us apart?
Customer service and quality services are very important to A & J Duct Cleaning. Our team goes through extensive training on the proper procedures for cleaning ductwork.
Honest
We are honest about every project. If we feel this could be handled another way by a different company or different contractor, we will refer you to someone else to handle it.
Documented
We take before and after pictures on every job.
Thorough
We never cut corners.
Specialized
We have many different crews that handle different services. For example, we have a crew that only deals with high end homes or commercial accounts. We have a crew that installs gutters and a crew that repairs trash chutes. Each specializes in a specific service.
Guaranteed
We guarantee all of our work.
A&J Duct Cleaning — Documented work
Before & after
Pictures on every job, beginning to end
Customer service and quality services are very important to A & J Duct Cleaning. We take pictures on every job to show the condition of the job from beginning to end. We also send a project completion report if any issues are found, and help you handle any issues found so you are not trying to figure out how to handle any issues on your own.
For the past 20 years, we have focused on keeping our customers and families breathing healthy air. Our team goes through extensive training on the proper procedures for cleaning ductwork.
See the full gallery →
The same job, photographed before and after the crew worked on it
A&J Duct Cleaning — Los Angeles & Vallejo, CA
Who we serve
Five kinds of customer
A&J has been in the duct cleaning industry for over 20 years. All technicians have years of industry experience and are friendly and accommodating with all clients.
Los Angeles is our main branch and runs all eleven services, cleaning and repair.
Vallejo is our smaller branch. It cleans air ducts, dryer ducts, trash chutes and grease exhausts, with gutter cleaning on some jobs — cleaning only, no repair work.
Residential
A clean home is a happy home, and regular residential air duct cleaning is an essential part of maintaining its condition. Dryer Vents, Wall Heaters, Gutters cleaning and more are all included in our services.
Commercial
Commercial duct cleaning is a service that can help ensure the air inside your facility is safe and healthy for your employees and customers.
Industrial
We have seen the worst industrial exhausts become sparkling and efficient, with improved air quality and increased productivity.
Restaurant
To keep the restaurant running smoothly, it is essential to hire a reputable duct cleaning company to ensure that your exhausts, vents, and other components are always clean and functioning properly.
Property management & contractors
We serve residential, commercial, industrial, restaurant clients and property management companies or contractors.
A&J Duct Cleaning — Before you book
Questions
Asked before every job
We also send a project completion report if any issues are found, and help you handle any issues found so you are not trying to figure out how to handle any issues on your own.
Are you licensed and insured?
Licensed & Insured. A&J has been in the duct cleaning industry for over 20 years, and holds Contractors LIC #1124619.
Do I get proof of the work?
We take before and after pictures on every job.
Do you guarantee your work?
We guarantee all of our work. We never cut corners.
Do you offer discounts for multiple services?
A&J Duct Cleaning offers discounts for doing multiple services at a time. There is currently $50 off any service over $500.
We photograph every job, start to finish.
See before & after →
A&J Duct Cleaning — Over 20 years
Other services
One call covers more than ducts
We have many different crews that handle different services. Each specializes in a specific service.
All services →
New special
$50 off any service over $500
A&J Duct Cleaning offers discounts for doing multiple services at a time.

