Luhai · duct fabrication and ventilation project coordination

Match the manufacturing route to the airflow system

For circular straight runs, the spiral item describes strip formed into a spiral lock seam. The inspected product collage shows a forming machine, stacks of circular sections and close views of the seam. The production image shows staff operating equipment, without a readable dimensional or leakage report. Ask which circular sizes and seams the present line can make, and which bends, branches, transitions and rectangular sections require another process.

For welded stainless work, approve steel grade, thickness, weld treatment and finish separately. A nearby stainless catalogue advertises 201/304 and a different thickness range; those details must not silently become the specification of every spiral section. For composite fire-related ductwork, obtain the complete assembly and appropriate evidence rather than borrowing a claim from the metal-duct line.

Turn headline capacity and delivery claims into an order-specific commitment

The profile claims a 5,000 m² site, 20 design/R&D staff, over 7,000 customers, daily production of “5000m”, three-day delivery and ten-year product warranty. The product page separately claims 99% on-time delivery. These are supplier statements; no audited production basis, delivery statistics or universal warranty terms were supplied in the reviewed pages.

Ask for a dated production plan tied to your material, diameter/section mix, fitting quantity and drawing release. Agree how revisions, bought-in components and site sequencing affect dispatch. Translate the warranty headline into written coverage, exclusions, start date and remedy; do not treat a website number as a promise for an export installation.

Read the project examples critically

The case index describes factory heat/odour extraction, kitchen exhaust, underground garages, offices, hospitals and metro ventilation. It offers application context rather than independently signed performance evidence. Some headings do not match the customer described in the excerpt: the Pannuo Instruments heading mentions Jiangtong Hospital, while the office heading and body use different Tianyu/Yutian wording.

Do not infer a named client endorsement or an accepted airflow result from those summaries. For a relevant reference, request a dated scope, drawing, supplied construction and acceptance record with permission to verify the customer. For a workshop extraction job, compare the contaminant/process and operating schedule, not only the building type.

Keep the material-board patent within its actual scope

The original CN114426423A application publication names 宜兴市鲁海暖通设备有限公司 as applicant and Fenshui Village as its address. Filed 10 March 2022 and published 3 May 2022, it concerns a high-temperature material board, with resin/cement and additive composition claims. The four-page original document is an invention application publication, not evidence here of a granted or currently effective right.

It does not establish that the selected spiral metal duct uses that formulation, nor does it provide a complete duct fire-resistance, leakage or acoustic certification. Ask for the exact supplied composite board/assembly evidence when relevant. General ISO wording found in promotional search results was not authenticated against an issuer certificate and is not endorsed here.

Coordinate fabrication, insulation and site acceptance

Luhai’s 2020 installation article mixes general duct advice and fire-system numbers without identifying a current project/code basis. Use it as a historical supplier article, not a universal installation design. Have the project designer approve the actual route, support loads, fire compartments, inspection/cleaning access and any required protective construction.

For cooled-air ductwork, the spiral item explicitly calls for insulation. Allocate insulation, vapour-control joints and protection of flanges/supports. A fabrication supplier and site contractor should agree the test boundaries before sections arrive, so a good straight seam does not conceal leakage at field fittings and connections.

Build a practical supplier enquiry

The official contact page publishes phone and email details. The sourced email is retained privately in CRM; no ownership claim or email campaign has been sent. The public catalogue does not establish an export MOQ, fixed price or overseas service network.

1. Issue the approved schedule

   Provide route drawings, diameters/sections, quantities, lengths, pressure/service and required material/finish.

2. Close the scope split

   Agree fittings, joint parts, seals, insulation, supports, transport protection and installation/testing ownership.

3. Approve evidence and delivery

   Obtain material traceability, dimensional and required leakage/assembly records, tagged packing lists and written lead-time/warranty terms.