The ducts that circulate air for heating and cooling are usually connected to HVAC machinery by flexible duct connectors made of durable fabric. For many decades, textiles woven from fibers were the primary material for this application.
Metal air ducts connect all the rooms in a home or building to HVAC equipment. When ducts are attached to heaters, air handlers and air conditioners directly, the noise and vibrations produced by the equipment may rattle throughout the entire ventilation system.
This problem is prevented by installing a flexible duct connector between the machinery and the ductwork. These connectors must absorb constant vibrations and resist hot and cold air circulated by HVAC systems, ideally lasting as long as the HVAC system itself.
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For several decades during the mid-20th century, manufacturers used to make heat-resistant flexible duct connectors. fibers are durable and fireproof, yet flexible enough to be woven into fabric. During the 1980s, manufacturers began using other heat-resistant materials to make duct connectors. International companies may still use in duct connectors, and there are no regulations to prevent them from entering the U.S.
Unfortunately, many old buildings still contain degrading materials in HVAC systems, and the tradesmen who work with these materials are at risk of developing mesothelioma or other -related diseases.
Duct connectors were originally manufactured as simple strips of coarse fabric woven from nearly pure yarn, which were secured to metal duct joints by clips or rivets.
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Paper was used as duct wrap insulation in HVAC systems around ductwork in basements and attics of older homes and buildings. This material often contained about 15% chrysotile .
Other -containing materials were used in HVAC systems, including cement, millboard and insulation. cement transite pipe was typically used as an air duct rather than a connector. millboard was used as a heat shield on walls and ceilings around HVAC systems. wrap insulation was sometimes used inside ducts to improve heating or cooling efficiency.
During the height of use in America, flexible duct connectors commonly contained significant amounts of chrysotile . The factory workers who produced these connectors suffered the worst exposure, followed by the construction tradesmen who installed, repaired or removed duct connectors on a regular basis.
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Occupational exposure is the No. 1 cause of work-related deaths in the world. According to a 2022 report by the European Commission, over 70, 000 workers died in 2019 from past exposure to .
Furthermore, aging and constant exposure to temperature extremes causes duct connector material to become friable, or easily crumbled into inhalable dust. Over time, even rubberized or vinyl-coated duct connectors can deteriorate to the point of releasing fibers into the air.
Microscopic dust has no scent, and exposure generally does not cause symptoms to develop until decades later. Because duct connectors are perfectly positioned to affect all the air in a building, degrading duct connectors pose a serious exposure risk.
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If you are diagnosed with an -related disease it is important to seek the medical advice of a specialist. Treating these diseases early improves chances of long-term survival.
Manufacturers of products are held liable through the U.S. court system for the diseases their products cause. Decades of personal injury lawsuits and wrongful death lawsuits revealed these companies were aware of the dangers of and decided to use the material despite its known health effects.Many people who develop -related diseases after years of working with toxic duct connectors have received compensation by suing manufacturers.
A mesothelioma lawyer can review your case and guide you on the types of legal claims you may qualify to file. You may be eligible to file a lawsuit and multiple claims with trust funds.
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Abating duct connectors should only be performed by licensed abatement professionals. Do not attempt to abate this type of product yourself. duct connector materials become friable with age and may release a significant amount of into the air.
If you believe duct connectors are in your home or place of work, hire a licensed professional to do the job to avoid unnecessary exposure among your family or coworkers.
American ductwork manufacturers phased out the use of during the 1980s and switched to cotton canvas or fiberglass mesh to make flexible duct connectors.
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Manufacturers began testing duct connectors as early as 1938 when the Johns Manville Corporation wrote about their advantages in the American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE) Journal. In 1951, as air conditioning systems were starting to become popular and affordable for homes, the National Fire Protection Agency officially recommended for flexible duct connectors.
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Is sponsored by law firms. This website and its content may be deemed attorney advertising. Prior results do not predict a similar outcome. For more information, visit our sponsors page.Often white in colour with a fibrous appearance, asbestos containing duct tape usually contains high levels of asbestos and is dangerous (friable) to disturb. Generally, it’s thick compared to modern duct tape and simply peeling it off a surface can cause asbestos fibres to suspend in the air. If your home was constructed before 1990 and you can see white tape on the ductwork take caution and do not touch it(disturb it) without proper controls in place to prevent exposure. Sampling is not always required for this ACM as its homogenous characteristics make it easy to identify so please assume it contains asbestos if uncertain. Asbestos containing fibreboard was also commonly used around heat registers and electrical panels as a fire retardant and like duct tape is a thermal system insulator. Equally high in content and sometimes friable (can be crumbled by hand pressure) great caution must be exercised when working around this material. A qualified abatement contractor should complete removal before any work on your ducts, registers or furnace (if in contact with asbestos duct tape) takes place.
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Asbestos containing duct tape and fiberboard are high asbestos content materials that can be dangerous if disturbed. If left undisturbed the likelihood of contamination or inhalation is low. However, as years pass the condition of this material can be damaged or degrade to a point where it is falling off ductwork and potentially contaminating areas of your home. A source of asbestos fibers in your home HVAC system can spread asbestos fibers.
Safe removal of asbestos containing duct tape and fiberboard is best handled by a qualified abatement contractor who can follow WorksafeBC regulations and has the manpower to do the job following established guidelines.
Safe removal or enclosure of the material is the best line of defense against asbestos containing duct tape and fiberboard as a means to block disturbance of fibers into your ductwork or living space. Some areas of your ductwork and venting may have degraded. Lifting off a vent cover or encountering a piece of (damaged) hanging asbestos containing tape can put you at risk of exposure. Please ensure that the area is safe by consulting a qualified person to assess the risk before proceeding. Ensure that you pass any information along to new homeowners should you decide to sell the property, if the modern duct tape is inadvertently peeled off, a disturbance of the tape below will occur.
Asbestos Removal Kit
Once all material has been removed using glove bags methodology, we begin the hygiene process by both wet wiping and HEPA vacuuming all areas that have been disturbed. At this point a qualified person determines if all materials outlined in the initial scope of work have been fully abated, this is also called the supervisors inspection. If passed, tear-down of the containment may occur and a post abatement inspection report will be provided to the client for their records and, to pass along to future owners who may be concerned about the presence of asbestos.
It looks as though someone tried to enclose the asbestos containing duct tape in the past – but it was not done properly.From the mid-1950s through the early '80s, sheet metal air ducts for forced-air heating systems were commonly insulated with a cardboard-like material that contained asbestos fibers. In some cases, a careful, close examination is necessary in order to determine whether these old heating ducts are composed of asbestos or merely insulated with it.
Also, look to see if the asbestos or insulation material is breaking or coming apart. If the material is undamaged, securely attached, and not exposed to routine contact, it does not pose a health risk.
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Duct tape is a white, flat material that was applied to air ducts to seal gaps and reduce air leaks. With a fibrous appearance, asbestos-containing duct tape usually contains high levels of asbestos and is dangerous to disturb. Generally, it is thicker than modern duct tape, white or grey in color, and simply peeling it off a surface can cause asbestos fibers to become airborne.
The asbestos-containing duct tape that was used by the HVAC industry to line and insulate pipes in heating and cooling systems within homes typically contains between 35 - 65% chrysotile asbestos. For a comprehensive evaluation
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