Fiberglass Duct Liners

How's the ventilation system in the places you frequent?

A view from the inside of a fiberglass lined duct

An air duct with a fiberglass insulation liner. The liner is old and dry rotted. It rips and crumbles when touched. The insulation was blowing into the air in large quanities in the form of small particles that one cannot see with the naked-eye. The tiny hairs called cilia in the lungs, which are used to stop particles, have a hard time stopping the smallest of particles, which often go through the lungs to the bloodstream.

A view from the inside of a fiberglass lined duct with an air vent going off to the left

An air duct with a fiberglass insulation liner. Lined ducts such as these cannot be properly cleaned. As the liner ages the air quality in the building or home deteriorates.

A view from the inside of a fiberglass lined duct with two air ducts shooting off to the left and right

Some of the worst offenders of these types of duct are US Post offices and other government buildings, including schools. When my three dogs ran over to the mail truck to say hello to the mail lady and all three of them sneezed repeatedly as soon as they got a whiff of the truck, it only confirmed why I would have a reaction to the mail that was delivered. Every post office I have personally walked into has had some of the worst air quality. When I receive mail and other packages from the United States post office I let it air out outside before I bring it into my house.

The inside of a fiberglass lined duct

An air duct with a fiberglass insulation liner.

The inside of a fiberglass lined duct taken at night with an iphone flashlight pointing at the duct

An air duct with a fiberglass insulation liner, which was removed from a HVAC system. Notice how the liner is ripped and dry rotted.

A section of a fiberglass lined duct laying outside after being removed

An air duct with a fiberglass insulation liner which was removed from a building. Lining the inside of an air duct was a very popular practice in the 1970s. The older the systems get, the more they break down and become airborne. The smaller particles often pass through the filter. On top of that, some of these lined ducts were located after the air filter, taking away any chance of it being stopped. The practice of lining the inside of a duct with fiberglass insulation is still being done today.

A fiberglass lined duct with a yellow cloth-like lining

An air duct with a cloth-like fiberglass insulation liner. This duct cannot be properly cleaned. Like the ducts above it was releasing large amounts of small invisible fiberglass particles into the air.

A white vent and a section of a fiberglass liner that was lining the vent

These air vents were lined with fiberglass insulation even though they led from one inside room to another inside room. It is unclear why the liner was even there, but the fiberglass was breaking down and becoming airborne.

The inside of an air duct with old dusty yellow fiberglass lining the inside with a black dirty layer on top. The fiberglass is exposed around the edges and the fiberglass is dusty and dirty.

A fiberglass lined duct

The inside of a fiberglass lined duct that is very dirty.

A dirty fiberglass lined duct

Looking down the inside of a fiberglass lined duct. It has a thick layer of dirt on top of the paper liner. The glass is falling apart and so is the outer paper.

A fiberglass lined duct that cannot be cleaned

Looking down the inside of an old dirty fiberglass lined duct. It is filthy.

A fiberglass lined duct

A section of a fiberglass lined duct with lots of black dirt all over the inside

An insulation lined duct return

A section of a fiberglass lined duct with lots of black dirt all over the inside and yellow insulation

An insulation lined duct return

A section of a fiberglass lined duct with lots of black dirt all over the inside laying on a floor after being removed

An insulation lined duct return

A school classroom with empty desks lined up in rows with one child in the front row with her head down not feeling well with tissues next to her. On the chalkboard to her left it says 'sick'. Above her are fiberglass lined ducts blowing bits of fiberglass into the air and on top of her head.

Does your child's school have fiberglass lined ductwork?

A grosery store produce section with oranges, apples, watermelon and other vegetables with fiberglass lined ductwork above showing bits of fiberglass coming out of the vent and landing all over the food.

Does your grocery store have fiberglass lined ductwork?

Sharon Maguire - Updated 5-8-2017

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