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

An air duct with a fiberglass insulation liner.

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.

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

Sharon Maguire - Updated 9-14-2016

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