Tactile marking is a common means of communication used by people with visual and hearing impairments (deafblindness) which is based on a standard system of manual signs for the deaf.

Several methods of communicating with people who are deafblind can be referred to as tactile cues, including:

* Manual transmission (also known as "hands-on signing"): The receiving hand is placed lightly behind the signer's hand to read characters by touch and gesture. The sign language used for handwriting is often a slightly modified version of the local sign language. You can find the tactile sign language services via the web.

Image Source: Google

* Tracking: The receiver holds the signer's wrist to keep an eye on the sign and get information from the signer's movements. This is sometimes used when the receiver has a limited field of vision.

* Tactile fingerprint (deaf-mute alphabet): Each word is written with the handwritten alphabet. A variety of handwritten alphabets can be used, such as the ASL one-handed alphabet or the two-handed alphabet, which is often used in an adapted form to communicate with the deafblind.

* Co-signing: The sender moves and manipulates the hand and arm of the deaf-mute to create symbolic shapes or words with their fingers. It is often used in children who are deaf and dumb to teach them to write and in people with intellectual disabilities.

* Body Signs: The body of a deaf-blind person is used to complete sign formation with other people. For example chin, palms, chest. It is often used in people with intellectual disabilities.

Today, HVAC (heating ventilation, and air conditioning) is a common use of ducts. They are primarily used to transport air. They play an important role in maintaining indoor air quality and temperature. Ducts must be capable of resisting external temperatures in order to keep the air moving through them at a constant temperature. 

Insulation materials are used to cover ducts. Because of their availability, aluminum and galvanized materials are the most common materials used to create duct boards. These materials can be very heavy, especially for galvanized mild steel. Polyurethane is used by some manufacturers.

duct boards

A type of plastic resin, polyurethane (PU), is one example. It can be made rigid or flexible. It can be used in many products, including industrial products. Because of its insulation properties, polyurethane is a common material.

Your refrigerator and freezers have polyurethane insulation boards. For homes that are more modern, the walls may have been lined with polyurethane panels or duct boards to reduce heat loss in colder months. 

Common areas for polyurethane-duct boards in commercial and residential buildings include cavities walls, floors, and roofs, large air ducts, and pipe and boiler areas. Insulation is more than just comfort. Insulation is more than just comfort. It can also help to keep cold and hot air at the same time. 

Although it may seem expensive to cover target areas with polyurethane duct boards, this will help homeowners and business owners save money over the long term.