16 families,
228+ catalog models
Flexible Ducts
Non-insulated flexible ducts for residential and commercial HVAC systems. Available in aluminum, polyester, and PVC conf…
Insulated Ducts
Insulated flexible ducts with fiberglass wool, polyester wool, or acoustic lining. R4.2 to R8 insulation values for ener…
Industrial Hoses
Heavy-duty industrial hoses and duct hoses for dust collection, fume extraction, material transfer, and high-temperature…
Duct Accessories
Essential HVAC duct accessories including connectors, aluminum foil tape, flexible connectors, and duct hangers. Everyth…
Ceiling Diffusers
Square, round, and louvered ceiling diffusers in aluminum and steel. 1-way to 4-way airflow patterns with MS or OBD damp…
Sidewall Supply Registers
Curved blade, straight blade, and adjustable sidewall supply registers. Steel and aluminum with multi-shutter or opposed…
Return Air Grilles
Return air grilles including eggcrate, perforated, fixed blade, and 45-degree deflection styles. Hinged access and filte…
Filter Grilles
Hinged filter return air grilles with removable filters. Steel and aluminum for residential and commercial HVAC.…
Six reasons to
partner with us
28 Years of Manufacturing
Founded in 1996. From duct design and R&D to production — fully integrated manufacturing with our own equipment.
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.
China & USA Dual Facilities
Main factory in Dongyang, Zhejiang with 10+ production lines. Warehouse and assembly in Houston, TX for US customers.
250+ Product Models
Flexible ducts, insulated ducts, industrial hoses, air grilles, diffusers, registers — 16 product families under one roof.
Custom & OEM
Custom diameters 1" to 48", custom lengths, private labeling. From prototype to bulk production in 30–45 days.
Own Equipment Design
All production lines run on machinery we designed and built in-house. Tighter tolerances, faster lead times, unique capability.
Built for every
HVAC application
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.
Ready to source?
Tell us what you need — flexible ducts, HVAC parts, or custom specifications. We respond within 24 hours.
Frequently asked questions
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.