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Process of fabrication and installation

 Pre-insulated Duct Fabrication and Installation Supplier & manufacturers | HAOHAI


Process of Pre-insulated Duct Fabrication and Installation

Step 1: Taking panels

First, unpack the packing, take the panel out and put it on the worktable.

Step 2: Protracting / Sampling

Protract the panel according to the dimension of drawing, and then put on the press ruler.

Step 3: Cutting

Cut the panel to be slope of 45°on edge and 90°on the turnover point with special tools according to the dimension of drawing.

Step 4: Gelatinizing

Cleaning the surface of substrates before application the adhesive on the slope surface. 

Step 5: Sticking

After gelatinizing, compose the panel to be a rectangle orbit before the glue is dry (It is usually in about 40 minutes and the glue is not slimy yet.)

Step 6: Sealing

Lay the glue equably on the four junctures of the rectangle duct with sealant, and then stick the aluminum tapes plaster on the junctures press it to be even.

Step 7: Put the flange on

Lay the special flange glue, which is developed by our company, on the flange and iron core compensatory angle, which are cut according the dimension, and install them on the four edge of rectangle duct.

8. Facture of arm

Protract and sample; cut the panel to be slope of 45°on edge; then slot and bend the outside panel and inside panel with the special slot machine. The curvature of arc lies on the space between curving rabbet. Then lay the special glue for panel on it and joint them; seal and install the flanges.

Stet 9: Reinforcing

Reinforce the duct after the duct being made up and jointed. It is made of reinforcement, aluminum shaped disk and screws. Attention: The duct’s breadth or height higher than 80cm need to be reinforced.

Step 10: Hanging and installing

Put I-shaped beyonet into flange slot to connect the ducts. Inject the sealing glue into the duct angle and insert the sealing angle. Because its special shape has avoided the gas revealing, other sealing or gaskets are not needed.


HAOHAI invested and set up a biological company named Shanghai Haohai Biotechnology Co.,Ltd, which was listed on the main board of the Hong Kong Stok Exchange with the share code of 06826, in 2019 it became the first private enterprise(H+A) listed on both Hong Kong and Sci-Tech Innovation Board(STAR Market) in China after being examined and approved by the Stock Listing Committee of Shanghai Stock Exchange.

HAOHAI has been maintaining its fast and steady growing trend, and has become a "Shanghai High-Tech Enterprise", "Shanghai Songjiang Technical Center" and "Advanced Enterprise and Civilized Unit in Technological Innovation", and obtained the ISO9001:2015 quality system certification.

HAOHAI is a private-owned high-tech enterprise specializing in the R&D, production and sales of polyurethane and aerosol products

HAOHAI has currently two major production bases, as well as R&D centers jointly established with famous colleges and universities.

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In PU foam (OCF) industry, Haohai is one of the leading PU foam manufacturers in China.

They are all manufactured according to the strictest international standards. Our products have received favor from both domestic and foreign markets.
They are now widely exporting to 200 countries.
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