What are the materials of the ventilation duct

At present, there are about 4 generations of fire fighting ducts on the market:

1 The first generation of galvanized iron fireproof cladding duct

Advantage is the production of unified technology, simple process, can meet the requirements of fire protection

But the shortcomings are also very obvious Installation process is complicated, need professional labor; and self-weight is large, increase the building load; outside the package of fireproofing board brittle, easy to rupture fall, there are Safety hazards! At present, with the increase in labor costs, safety requirements, will gradually withdraw from the market!

2 The second generation of double-sided color steel modified phenolic duct & steel heat-insulating smoke duct

Advantages are simple installation process; light weight;

Disadvantages are phenolic is a grade B product, high temperature will be carbonized, the loss of integrity and thermal insulation; phenolic and bonding adhesive is an organic substance, combustion will produce smoke toxicity; the thickness of the color steel is not more than 0.5mm, easy to rust and corrosion, lack of strength, do not have Rust, insufficient strength, not high temperature resistance, deformation and delamination after heat, can not meet the new regulations GB51251-2017 requirements.

With the mandatory implementation of the new GB51251-2017, the second generation of products will be amalgamated

3 Third generation double-sided color steel glass wool & fireproof board wrapped air ducts Advantages are simple installation process of air ducts, the weight of the relatively light;

Disadvantages are the outer fireproof board brittle, easy to rupture and fall, the existence of safety hazards; the thickness of the color steel does not exceed 0.5mm, the strength is insufficient, the deformation after heat delamination, can not meet the requirements of the new GB51251-2017. 0.5mm, insufficient strength, high temperature resistance and easy deformation, layered glass wool can not withstand high temperatures of more than 500 degrees alone, loss of heat insulation after carbonization; easy to rust, no moisture, short product life; not up to the acceptance of the GB50243-2016 requirements.

This product is mainly cheap and easy to install, gradually replacing the first and second generation products. But with the national mandatory implementation of the new requirements after 2019, it will also be eliminated from the market.

4 The fourth generation Prefabricated assembled GFZ calcium refractory smoke exhaust duct

Advantages Assembly and installation process is fast; refractory cement and a variety of minerals as the main material, 100% asbestos-free, no chemical adhesives, which are environmentally friendly materials; mechanical one-time composite, high bonding strength, fire-resistant and heat-insulating properties; structural strength, moisture-proof and mildew-resistant, beautiful appearance; to achieve the new national regulations GB51251-2017 standard limit requirements (3h).

Disadvantages are The price is about 20% more expensive than the third generation. But with the gradual implementation of the new GB51251-2017 standard, as well as the popularization and application of assembly building, will gradually replace the previous three generations of products.