25+ Years Manufacturing🇺🇸 Made in USA Available

Your One-Stop
HVAC Parts
Supplier

Grilles, dampers, plenums, spiral ducts, copper line sets, and controls — all from one certified manufacturer. China factory + Houston, TX facility.

UL ListedCEAWTAM1 FranceROSH
744+
SKUs
60+
Countries
UL
Certified
3
Facilities
Why Hstube

Manufacturer, Not Trading Company

Every advantage below is built on our own factory floor — 6 production lines, self-developed equipment, in-house quality control.

One-Stop Supply

Grilles, dampers, plenums, ducts, copper lines, controls — all from one manufacturer. One PO, one quality standard, one shipment. Cut procurement costs by 20–30%.

126 products / 744 SKUs

China + USA Dual Facilities

Full manufacturing in Dongyang, China. Spiral duct fabrication in Houston, TX (4,300 m²). US customers get "Made in USA" products with 5–10 day local delivery.

3 facilities on 3 continents

UL Certified — Top 3 in China

UL listing held by only 3 Chinese HVAC manufacturers. Plus CE, M1 (France), AWTA (Australia), ROSH. Every product meets international safety standards.

5 international certifications

Self-Developed Equipment

We design and build our own production machinery — complete control over tolerances, speed, and innovation. Competitors buy off-the-shelf; we engineer in-house.

6 production lines
Global Presence

Three Continents, One Supplier

Manufacturing in China. Fabrication in the USA. Distribution in Australia. Wherever your project is, we deliver.

🇨🇳
Manufacturing HQ

China — Dongyang

5,000 m² factory · 6 production lines · 60–80 employees · Full HVAC parts manufacturing & testing

🇺🇸
Spiral Duct Fabrication

USA — Houston, TX

4,300 m² facility · Spiral ducts & fittings · "Made in USA" products · 5–10 day US delivery

🇦🇺
Trading & Distribution

Australia — Sydney

Local warehouse · AWTA-certified Airwise Flex brand · Australian building code compliance

Sustainability

Responsible Manufacturing

We believe manufacturing excellence and environmental responsibility go hand in hand. Our facilities operate with energy-efficient production lines, material waste recycling programs, and a commitment to reducing our carbon footprint across the supply chain.

  • Production waste recycling — galvanised steel off-cuts reprocessed
  • Energy-efficient self-developed equipment — 30% less power consumption
  • Optimised logistics — consolidated shipping reduces per-unit carbon emissions
  • ROSH compliant — hazardous substance restrictions across all product lines

Green
Manufacturing

Frequently Asked Questions

What HVAC parts do you manufacture?
We manufacture 126 products across 7 categories: air grilles and diffusers, plenums and air boxes, dampers and zone controls, ventilation and louvers, ducts and metal fittings, copper pipe and fittings, and installation accessories. Total catalog: 744 SKUs covering everything from air distribution to climate control.
What is the advantage of one-stop HVAC sourcing?
One-stop sourcing means one purchase order, one quality standard, one shipment, and one point of contact. This typically reduces procurement costs by 20–30%, eliminates coordination between multiple suppliers, ensures consistent quality across all components, and simplifies your supply chain management.
Do you have a facility in the USA?
Yes, we operate a 4,300 m² (46,000 sq ft) facility in Houston, TX for spiral duct and fittings fabrication. This allows us to offer "Made in USA" spiral duct products with 5–10 day delivery to US customers, while other HVAC parts ship from our China factory in 15–25 days.
What certifications do your products carry?
Our products carry UL listing (one of only 3 Chinese HVAC manufacturers with UL), CE marking, M1 certification (France), ROSH compliance, and AWTA certification (Australia). Fire dampers are specifically UL 555 listed for fire-rated applications.
What is your minimum order quantity?
MOQ varies by product. Standard catalog items typically start at 100–500 pieces. Custom OEM orders usually require 500–2,000 pieces depending on tooling and customization complexity. We are flexible — contact us with your specific requirements.
Can you provide free samples?
Yes, we offer free samples for most catalog products. Shipping costs for samples are at the buyer's expense. Custom-specification samples may incur a small tooling fee which is refundable against the first order. Request samples here.

Ready to Simplify Your HVAC Sourcing?

Send us your parts list and get a consolidated quote within 12 hours. 126 products, 744 SKUs — one supplier, one shipment, one invoice.