25+ Years Building the World'sHVAC Infrastructure
From a small workshop in Beijing in 1996 to a global manufacturer with facilities on three continents. We don't just sell HVAC parts — we make them.
From Beijing Workshop to Global Manufacturer
Our founder, Mr. Hu, started in the HVAC industry in 1996 with a small production workshop in Beijing. What began as a local operation quickly grew as the quality of the products earned a reputation among contractors and distributors across China.
In 2010, we established Dongyang Hstube Co., Ltd in the Chengdong Ecological Industrial Park in Zhejiang province — a purpose-built factory with 6 production lines and the capacity to serve global markets. Crucially, we design and build our own production equipment, giving us complete control over quality, efficiency, and innovation.
Today, with a trading company and warehouse in Sydney, Australia, and a 4,300 m² spiral duct fabrication facility in Houston, Texas, we serve HVAC contractors, distributors, and OEM partners in over 60 countries. Our UL certification — held by only 3 Chinese HVAC manufacturers — is a testament to the standards we hold ourselves to.
Factory photo coming soon
Production line
Warehouse
Company Milestones
Three decades of growth, from local workshop to global manufacturer.
Industry Roots — Beijing
Mr. Hu begins his career in the HVAC industry with a small production workshop in Beijing, focusing on flexible ducting for the domestic market.
Dongyang Factory Founded
Dongyang Hstube Co., Ltd established in Chengdong Ecological Industrial Park, Zhejiang. Purpose-built facility with self-developed production equipment and 6 production lines.
Australia Expansion
Trading company and warehouse established in Sydney, NSW. Airwise Flex brand launched with AWTA certification for Australian building compliance market.
UL Certification Achieved
Received UL listing — one of only 3 Chinese HVAC manufacturers to achieve this certification. A major milestone for US market access.
60+ Countries Reached
Products exported to over 60 countries across North America, Europe, Australia, Middle East, and Southeast Asia. OEM partnerships with leading global brands.
Houston, TX Facility
4,300 m² spiral duct fabrication facility established in Houston, Texas. "Made in USA" products for the American market with local delivery speed.
One-Stop HVAC Parts
Launch of the one-stop HVAC parts platform — expanding from flexible ducts to a full range of HVAC components including grilles, dampers, controls, and copper line sets.
What Sets Us Apart
We are a manufacturer, not a trading company. Every advantage below is built on our own factory floor.
Self-Developed Equipment
We design and build our own production machinery. This gives us complete control over manufacturing tolerances, production speed, and the ability to customize equipment for new product lines — something competitors who buy off-the-shelf machines cannot match.
UL Certification — Top 3 in China
Our UL listing is one of only 3 held by Chinese HVAC manufacturers. This is not just a badge — it means every product in the UL-listed range has been tested and verified to meet US safety standards, giving our customers confidence in compliance.
Vertical Integration
From raw material procurement to finished product packaging — everything happens under our roof. We do not outsource critical production steps, which means consistent quality, shorter lead times, and the flexibility to handle both large-volume orders and custom one-offs.
One-Stop HVAC Supply
Most HVAC parts suppliers specialize in one category. We cover grilles, dampers, ducts, controls, copper line sets, and more. One purchase order, one quality standard, one shipment — reducing your procurement costs by 20–30% and eliminating multi-supplier coordination.
Global Presence
Three facilities on three continents. Wherever your project is, we can deliver.
China — Dongyang, Zhejiang
- 5,000 m² factory facility
- 6 production lines (self-developed equipment)
- 60–80 employees
- Full HVAC parts manufacturing
- Quality testing laboratory
- Export packaging & logistics
USA — Houston, Texas
- 4,300 m² (46,000 sq ft) facility
- Spiral round duct fabrication
- Duct fittings manufacturing
- "Made in USA" products
- 5–10 day delivery to US customers
- Local technical support
Australia — Sydney, NSW
- Trading company + warehouse
- AWTA-certified Airwise Flex brand
- Australian building code compliance
- Local inventory for fast delivery
- 5-6 person team
- Established distribution network
Certifications & Compliance
Our products meet the highest international safety and quality standards.
UL Listed
US safety standard. One of only 3 Chinese HVAC manufacturers with UL.
✅ ActiveCE Marking
European conformity marking for the EU market.
🔄 In ProgressM1 (France)
French fire resistance classification for building materials.
✅ ActiveROSH
Restriction of hazardous substances compliance.
✅ ActiveAWTA (Australia)
Australian Wool Testing Authority certification for Airwise Flex brand.
✅ ActiveAbout Hstube — FAQ
Is Hstube a manufacturer or a trading company?
What does "one-stop HVAC parts supplier" mean?
Why is UL certification important?
Can I visit your factory?
Do you provide OEM / private label services?
Ready to Partner With Us?
Whether you need a one-time order or a long-term OEM partnership, we are here to help. Get in touch for factory-direct pricing.