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3.3 Fireproof performance Galvanized sheet steel duct: non-combustible, but whether the insulation layer burns depends on the material, usually non-combustible insulation materials such as centrifugal glass wool are used. Inorganic glass fiber reinforced plastic duct: same as galvanized sheet steel duct. Composite glass fiber board air duct: using non-combustible glass fiber cotton board as the base material, using a flame-retardant adhesive, the aluminum foil cloth and glass wire cloth are respectively compounded on both sides of the base material, so the finished air duct is a non-combustible material, with Good fire resistance.
3.4 Moisture-proof performance Galvanized sheet steel duct: It is susceptible to moisture, corrosion, and rust, which is more serious when transporting air with high moisture content. When the duct is made, the galvanized layer at the iron bite is damaged, and it is not easy to make up and do anti-corrosion treatment. Condensation and corrosion of the pipeline will also occur where the cold bridge is generated, thus affecting its overall life. Inorganic glass fiber reinforced plastic air duct: Restricted by the ratio of raw materials, the stability of its moisture-proof performance is poor. Composite fiberglass board duct: no perishable materials and components, the outer surface of the duct is moisture-proof aluminum foil cloth, its moisture permeability is 0, and it has strong anti-corrosion ability. The water absorption rate of the fiberglass board is not more than 2%, and the pipe In a damp environment for a long time, its muffling and heat preservation properties will not change. Because it is a porous material, it is necessary to prevent the inside of the pipe, pipe ends and cuts from being soaked in water for a long time.
3.5 Air leakage: Galvanized sheet steel duct: When the total length of the duct is less than 50m, the air leakage rate usually reaches 8% to 10%. When the total length of the duct increases, the amount of air leakage should be appropriately increased. When the static pressure in the pipe is 500Pa, the air leakage per unit area of the duct is 6m3/h & #183; m2. Inorganic glass fiber reinforced plastic air duct: When the total length of the air duct is less than 50m, the air leakage volume usually reaches 6% to 8%. When the total length of the air duct increases, the air leakage volume should be appropriately increased. Composite glass fiber board duct: The duct is connected by slotting, tenoning, and gluing, and the joint is sealed with aluminum foil tape. The air leakage rate of the unreinforced duct is basically 0, and the air leakage rate of the reinforced duct is not more than 1%. The air leakage rate is not more than 2%. When the static pressure in the pipe is 500Pa, the air leakage per unit area of the duct is less than 1.8m3/h & #183; m2.
3.6 Strength Galvanized sheet steel duct: high strength, strong static pressure resistance, it must be reinforced according to regulations when the section size is large. Inorganic glass fiber reinforced plastic duct: high strength, but relatively fragile, because it is heavier, not easy to handle, easy to be impacted and cause cracking and damage. Due to the large self-weight, the wall thickness of the duct increases rapidly when the side length of the horizontal plane is large, and the wall weight per unit area increases greatly, which is prone to permanent vertical deformation and settlement. Composite glass fiber board duct: It can meet the pressure requirements of general ventilation and air conditioning. When the wind pressure is 500Pa, the deformation of the pipe wall is not more than 1%. When the wall thickness is 25mm, it can withstand 800Pa static pressure. If it needs to withstand more pressure or the side length of the duct is more than 630mm, it can be reinforced according to the wind pressure and design requirements, and the maximum can withstand wind pressure of 1500Pa.
3.7 Weight galvanized sheet steel duct: bulk density is 7870kg/m3, unit area weight is 10kg/m2～16kg/m2 (thickness of thin steel plate δ=0.5mm～1mm, including insulation layer and protective layer weight, including flange , The weight of the suspension bracket is 4kg～4.8kg). Inorganic glass fiber reinforced plastic air duct: bulk density is 2100kg/m3, unit area weight is 11kg/m2～23kg/m2 (wall thickness δ=3mm～8mm, including insulation layer and protective layer weight, including the weight of the suspension bracket 1.7kg). Composite glass fiber board air duct: the bulk density is 64kg/m3, the unit area weight is 2.8 kg/m2 (wall thickness δ=25mm, including the weight of the suspension bracket is 1.5kg).
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