Flexible duct & HVAC parts manufacturer
Aluminum flex duct, insulated duct, industrial hoses, grilles, diffusers and registers — 228+ models built on production lines we design ourselves.
Our products
16 product families and 228+ catalog models — from UL-listed flex duct to laser-cut decorative registers.
Our locations
A factory in China and a warehouse in the United States let us be more responsive to your needs, wherever you are.
- Dongyang, Zhejiang, China — Main factory, since 2008
- Houston, TX, USA — Warehouse & assembly, since 2024
- Exporting to — 60+ countries worldwide
Why Hstube
- 01
28 Years of Manufacturing
Founded in 1996. From duct design and R&D to production — fully integrated manufacturing with our own equipment.
- 02
UL Listed & Certified
One of only 3 factories in China with UL listing for flexible ducts. Also CE, M1 (France), ISO 9001, and SGS certified.
- 03
China & USA Dual Facilities
Main factory in Dongyang, Zhejiang with 10+ production lines. Warehouse and assembly in Houston, TX for US customers.
- 04
250+ Product Models
Flexible ducts, insulated ducts, industrial hoses, air grilles, diffusers, registers — 16 product families under one roof.
- 05
Custom & OEM
Custom diameters 1" to 48", custom lengths, private labeling. From prototype to bulk production in 30–45 days.
- 06
Own Equipment Design
All production lines run on machinery we designed and built in-house. Tighter tolerances, faster lead times, unique capability.
Why we’ve grown
Designated a National High-Tech Enterprise, Hstube runs 10+ production lines on equipment we designed and built ourselves, in a 5,000 m² facility in Dongyang, Zhejiang.
Building our own machines means tighter tolerances, custom diameters from 1" to 48", and prototype-to-container lead times of 30–45 days — helping distributors carry less inventory without missing an order.
Applications
Residential HVAC
Flex duct, insulated duct (R6/R8), diffusers, grilles, and registers for home heating, cooling, and ventilation systems.
Commercial HVAC
Large-diameter duct, ceiling diffusers, linear slot diffusers, and plenum boxes for offices, retail, and hospitality.
Industrial Ventilation
Heavy-duty canvas, nylon, PU, and PVC hoses for dust collection, fume extraction, and material transfer.
Specialized Environments
Acoustic duct for studios, silicone hose for high-temperature, decorative registers for upscale interiors.
FAQ
More answers on our FAQ page.
What products does Hstube manufacture?
We manufacture flexible air ducts (aluminum, polyester, PVC, semi-rigid), insulated ducts (R4.2/R6/R8), industrial hoses (nylon, canvas, silicone, PU, PVC), and a full range of HVAC air distribution parts including ceiling diffusers, registers, grilles, and plenum boxes — over 228 product models in total.
What certifications do your ducts carry?
Our flexible ducts are UL listed — we are one of only 3 factories in China with this certification. We also hold CE, M1 (France), ISO 9001 quality management, SGS, and RoHS compliance.
Do you have a facility in the United States?
Yes. Our main factory with 10+ production lines is in Dongyang, Zhejiang, China. We also operate a warehouse and assembly facility in Houston, TX for US customers needing fast domestic delivery.
What is the minimum order quantity?
For stock catalog items, MOQ is flexible. For custom or OEM orders, typical MOQ is 500–1,000 pieces depending on the product. Contact us for specific pricing.
Can you provide custom sizes and private labeling?
Yes. We manufacture custom diameters from 1" to 48", custom lengths, custom insulation values, and private labeling. Our in-house equipment design capability means we can produce non-standard specifications. Prototype to bulk in 30–45 days.