High Quality Custom Hvac Ductwork From VENTECH

In order to provide the highest quality hvac duct machine, manufacturers usually do not save money on raw materials. Manufacturers collect extensive knowledge and long experience in material selection, and can thus bring about the production of maximum value for customers with the products that are final. It may cost customers more to cover for better raw materials, but also the enhanced product performance will surely be worth it.

YINGDE VENTECH INTELLIGENT EQUIPMENT CO., LTD. wins the market and establishes a reputation through its foam cutting machine. automatic machine is the main product of VENTECH INTELLIGENT EQUIPMENT. It is diverse in variety. The product is not inclined to have safety issues. It is designed with a protection system to guard against any electric problems such as leakage, overload, and overheat. This product has been praised by its prominent energy-saving effect. Stressing the quality of service of VENTECH's staff turns out to be effective. It can be painted with a variety of colors for the sake of recognition.

Making each customer satisfied with our automatic machine and service is our ultimate goal. Check it!

HVAC duct fabrication
A good HVAC system improves the quality of the indoor air at an acceptable level. HVAC systems with poor designs and installation are a safety hazard. Therefore, these types of projects should always be done by experienced professionals who have the necessary knowledge and equipment to execute a project.


GI Duct Fabrication
There are basically two types of ductwork. The first type is rigid and made of galvanized sheet metal. We call it GI duct. GI duct is the most frequently used duct in a rigid duct system.
The fabrication process for GI ducts involves precisely cutting and bending sheet metal into the desired cylindrical or rectangular shapes. It includes computerized design, measurements, and careful ductwork installation. The existing components of the commercial building's heating and cooling system should be considered. The width-to-height ratio in a commercial building is very important as well. It should provide space for metal ducts to optimize energy efficiency and performance.
A professional person makes sure all of the manufactured pieces fit together tightly. All grooves and openings need to line up exactly in order, which guarantees proper insulation and proper airflow.


Pre insulated duct Fabrication
The other type is pre-insulated duct system. Pre-insulated ductwork is designed to minimize the amount of space required to be dedicated for ductwork in any building by eliminating the extra space needed to manually install a layer of insulation around the ductwork. The most common used materials are PIR/PU/phenolic duct.
Pre-insulated ductworks can be cut and shaped by hand, but this is a difficult task. Automated duct panel cutting machines do the work of cutting PIR/PU/phenolic ducts into all kinds of shapes designed by a computer. One of the advantages of a duct panel cutting machine is that it saves lots of time and labor costs. The other advantage is it maximized the use of materials. This kind of duct panel cutting machine is also called a CNC duct fabrication machine. It is becoming more and more popular among some countries. For contractors of duct factories, duct panel cutting machine is essential for them to improve efficiency and saving labor costs, when they have lots of works to be done with limited time.


After cutting into pieces, fold the pieces into pipes and install the pipes into the space. The work is done!

Installation and connection of metal air ducts


The installation of metal air ducts is consist of several parts: hangers, ducts, and valves.
Installation of hangers
1. The installation of the support and hanger shall be symmetrically installed according to the center line of the air duct, the hanger shall be fixed safely and reliably, and the welded part shall be painted.
2. When installing the riser pipe clamp, the top pipe clamp should be fixed first, from top to bottom.
3. The air duct is long. When installing the brackets in a row, install the two ends first. Take the brackets at both ends as the benchmark, and install the brackets in the middle by the pulling method.
4. Horizontal installation Long side ≤ 400 mm, spacing ≤ 4 meters; long side > 400 mm, spacing ≤ 3 meters; the support and hanger of the spiral duct are 5 meters and 3.75 meters respectively.
5. If the length of the main and dry air ductsexceeds 20 meters, there should be fixed points to prevent swinging, and it should not be less than one in each system. When the air duct is installed vertically, the distance between the supports and hangers is ≤4 meters, and a single root has at least two fixed points.
6. The support and hanger shall not be set at the tuyere, valve, inspection door and automatic control mechanism, and the distance from the tuyere shall be greater than 200 mm.
7. The angle of the hoop bracket should be straight, the arc of the circular air duct should be uniform, and the hoop should be close to and hold the air duct.
8. The support and hanger of the thermal insulation duct should be placed outside the thermal insulation layer. The thermal insulation duct should not be in direct contact with the support and hanger. It should be padded with strong thermal insulation and anti-corrosion materials, and its thermal insulation thickness is the same as that of the thermal insulation layer to prevent "cold bridges".


Connection of air ducts
1. The flange gasket material is made of airtight and elastic materials. The flange gasket should minimize the number of joints. The joint form should be stepped, and the joint should be coated with sealant.
2. When the flange is connected, first pad the gasket, then align the two flanges first, put on a few bolts and tighten the nut without tightening, and then use a sharp punch to insert it into the unbolted screw hole, Pry the two screw holes until all the bolts are in, then tighten the bolts. When tightening the bolts, tighten them gradually and evenly.
3. After the air duct is connected, check whether the air duct connection is straight based on the flanges at both ends.
4. The bolts connecting the stainless steel air duct flanges should be made of stainless steel of the same material, and the ordinary type should be sprayed with paint.
5. Galvanized bolts are used for the connection of aluminum plate air ducts, and galvanized washers are placed on both sides of the flange.
6. For non-metallic air duct flange connection, the end faces of the two flanges should be parallel and tight, and galvanized washers should be added on both sides of the flange bolts.
7. When the composite material air duct is flanged, there should be measures to prevent cold "cold bridge", the bolts connecting the flanges should be tightened evenly, and the nuts should be on the same side.





Installation of air ducts
1. Technical requirements, the level of surface installation should be ≤3mm per meter, and the total deviation should be ≤20mm; the verticality should be ≤2mm per meter, and the total deviation should be ≤20mm; concealed installation, the position should be correct, and there should be no obvious deviation.
2. Installation sequence: dry pipe first and then branch pipe, installation method: determined according to the actual situation.
It can be connected to a certain length on the ground, and then hoisted as a whole. Generally, it can be extended to about 10-12 meters. Use an inverted chain or a lift to hoist the air duct to the bracket (heavier air duct), or you can lift the air duct to the support. The tubes are placed on the bracket section by section and connected section by section.
3. When the air duct passes through the fire-proof and explosion-proof wall or floor that needs to be closed, a pre-buried pipe or protective casing should be installed, and the thickness of the steel plate should not be less than 1.6mm. Non-hazardous flexible material closure.
4. The joints of composite air ducts should be firm and free of holes and cracks. After the installation of the air duct system, the tightness inspection should be carried out according to the system category.


Installation of air valves
1. Before installing the air valve, check whether the frame structure is firm, and whether the adjustment braking, positioning and other devices are accurate and flexible.
2. The installation of the air valve is the same as the installation of the air duct. Align its flange with the flange of the air duct or equipment, add sealing gaskets, and tighten the bolts to make it firmly and tightly connected with the air duct or equipment.
3. When installing the air valve, the operating device of the valve should be easy to operate manually, and its installation direction should be consistent with the direction marked on the valve shell.
4. The installed air valve should have obvious and accurate opening direction and opening degree signs on the valve shell. The fusible part of the fire damper should be installed on the windward side of the air duct, and its melting point temperature should meet the design requirements.
In nowadays air duct market, GI ducts(galvanized iron ducts) is still holding the large proportion, yet PI ducts(pre insulated ducts) is also generalizing worldwide very fast. Intelligent duct machinery can be an outstanding edge of your team, for which you can always rely on VENTECH.





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How to design should the ventilation system of commercial buildings?


1. Shops and public areas
Large shops and department store areas generally use an independent all-air system, and the exhaust system is designed independently. The exhaust air volume is calculated as 80% of the fresh air volume. Select a fan.
The exhaust air of small shops and public areas is generally concentrated in the commercial atrium with exhaust vents, and fans are installed on the commercial roof, and the exhaust air volume is calculated as 80% of the total fresh air volume of the shops and public areas. If the public area air-conditioning system adopts an all-air system, the exhaust air volume in the air-conditioning season and transition season should also be calculated and selected according to the different fresh air volume or the number of fans turned on should be adjusted.


2. Dining kitchen area
The exhaust air volume in the catering kitchen area is generally calculated according to the number of air changes, and the height of the kitchen is considered as 3 meters; at the same time, the air supply and exhaust system are considered, and the air supply volume (generally 80% to 90% of the exhaust air volume) is slightly less The exhaust air volume is used to maintain a slight negative pressure in the room; the air supply system in the catering and cooking furnace area does not have pre-cooling in summer and no pre-heating in winter; considering accident ventilation, it is calculated based on the number of air changes 12 times/h.





3. Logistics area
Logistics areas such as garages, toilets, pantries, garbage rooms and unloading areas should be properly designed with ventilation systems.
The exhaust air volume of the toilet and garbage room is calculated according to the number of air changes 15 times/h, and the exhaust air volume of the pantry is calculated at 10 times/h. For projects with conditions in the garbage room, it is recommended to design a split air conditioner, and at the same time, the exhaust air is discharged after purification. The exhaust system of the garbage room is set up independently and adopts an independent shaft.

4. Equipment room
Equipment rooms such as pump room, refrigeration room, generator room, power distribution room and elevator machine room need to design ventilation systems according to different requirements.
The air volume of living pump room and fire pump room is calculated by the number of air changes 4-6 times/h, the air volume of waterscape pump room is calculated by the number of air changes 10 times/h, and the sewage pump room is generally calculated by the number of air changes 20 times/h (The specification requires 8 to 12 times/h) to calculate. At the same time, the air supply and exhaust system are designed. The air supply and exhaust volume of the living pump room, fire pump room and waterscape pump room are equal to the exhaust air volume. The air supply volume of the sewage pump room is calculated according to 80% to 90% of the exhaust air volume. The exhaust system of the sewage pump room needs to be set up independently and adopts an independent shaft.
Generally, the refrigeration host of large commercial buildings adopts fluorine refrigeration host, and the exhaust air volume of the refrigerating machine room is calculated according to the number of air changes per hour. In the refrigeration room using R134a refrigerant, the accident exhaust fan is controlled by the oxygen detector to exhaust the accident air; the air supply system is designed, and the air supply volume is equal to the exhaust air volume, that is, the zero-pressure design. Refrigeration rooms with open-type refrigerators require additional air conditioning cooling equipment.
The exhaust air volume of the generator room and the power transformation and distribution room is calculated according to the actual heat dissipation requirements of the equipment; when using gas to extinguish the fire, the exhaust air after the fire should be considered at the same time, generally calculated according to the number of air changes 5 times/h. The exhaust fan is selected according to the larger value of the two, and the air supply volume is calculated according to 80% to 90% of the exhaust air volume.
The exhaust air volume of the elevator machine room is calculated based on the number of air changes per hour. The exhaust fan is equipped with a temperature control device. The temperature in the machine room controls the start and stop of the exhaust fan, and the car door on each floor naturally enters the air. At the same time, a split air conditioner is designed to cool down.





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HVAC Ductwork Fabrication

Emerging HVAC Technologies and Innovations in 2025



The HVAC industry is at the forefront of innovation, blending cutting-edge technologies with environmental stewardship. In 2025, the focus is on smarter, greener, and more efficient systems that meet the evolving needs of both residential and commercial spaces. Here’s an in-depth look at the technologies and trends shaping HVAC systems in 2025.



1. AI and Machine Learning in HVAC

Artificial Intelligence (AI) is revolutionizing how HVAC systems operate in 2025. Machine learning algorithms analyze vast amounts of data to optimize system performance, reduce energy consumption, and predict maintenance needs.



Applications include:

Predictive analytics: AI-powered HVAC systems anticipate faults, minimizing downtime and repair costs.

Energy optimization: Machine learning algorithms adjust system settings in real time to achieve optimal energy efficiency.

User personalization: AI learns user behavior to provide tailored comfort settings and reduce unnecessary energy use.



2. Electrification of HVAC Systems

The global push towards decarbonization has accelerated the electrification of HVAC systems. Electric-based technologies, such as heat pumps, dominate the market as they offer cleaner alternatives to fossil fuel-based heating systems.



Key developments include:

All-electric buildings: HVAC systems in new constructions are fully electric, reducing carbon footprints.

Cold climate heat pumps: Advances in technology have made heat pumps efficient even in sub-zero temperatures, broadening their application.

Support for grid modernization: Electric HVAC systems integrate with smart grids to balance energy demand and supply efficiently.



3. Compact and Space-Saving Designs

In 2025, urbanization and the rise of smaller living spaces have driven demand for compact, space-saving HVAC solutions. Modern systems are designed to maximize performance while minimizing their footprint.



Trends include:

Ductless mini-split systems: These systems provide efficient heating and cooling without requiring extensive ductwork, making them ideal for retrofits and small spaces.

Packaged HVAC units: All-in-one systems that combine heating, cooling, and ventilation components into a single compact unit are increasingly popular.

Slimline designs: Sleek, low-profile units blend seamlessly into interior designs while delivering high performance.



4. Smart Sensors and Automation

Automation continues to transform HVAC systems in 2025, making them more intuitive and efficient. Smart sensors monitor environmental conditions and adjust system operations automatically for optimal performance.



Examples include:

Humidity control: Sensors monitor humidity levels and adjust dehumidifiers or humidifiers as needed.

Occupancy-based systems: HVAC systems automatically reduce energy usage when rooms are unoccupied, cutting costs without sacrificing comfort.

Weather-responsive controls: Systems adapt to real-time weather changes, ensuring consistent indoor conditions.



5. Decentralized HVAC Systems

Decentralized HVAC systems, which provide individual units for specific zones or areas, are gaining traction in 2025. These systems offer greater energy savings and flexibility compared to centralized systems.



Advantages include:

Customizable comfort: Different zones can be heated or cooled independently, catering to varied preferences.

Energy efficiency: Decentralized systems reduce energy waste by targeting specific areas rather than the entire building.

Ease of maintenance: Repairs and replacements can be localized, minimizing disruption and reducing costs.



6. Focus on Low-Carbon HVAC Systems

With increasing emphasis on sustainability, low-carbon HVAC systems are a priority in 2025. These systems aim to reduce greenhouse gas emissions and energy consumption while maintaining performance.



Innovations include:

Hydronic systems: Water-based systems use less energy for heating and cooling, reducing carbon footprints.

Natural refrigerants: Refrigerants like CO2 and hydrocarbons are replacing synthetic options due to their minimal environmental impact.

Energy storage integration: HVAC systems now include energy storage options, allowing users to store renewable energy for later use.

Conclusion

The HVAC industry in 2025 is marked by groundbreaking advancements and a commitment to sustainability. From AI-driven smart systems to compact designs and low-carbon technologies, the focus is on creating solutions that are efficient, user-friendly, and environmentally responsible. As these trends continue to evolve, HVAC professionals and manufacturers are well-positioned to meet the challenges of the future, delivering comfort and efficiency in a rapidly changing world.



By Sammi