Spiral or Oval Duct Work

Air moves through spiral ducts with smooth flow because of the round duct shape and continuous duct path.

Air moves through oval ducts in a compact shape that saves height while still supporting efficient air distribution.

Spiral supply air ducts and oval supply air ducts deliver conditioned air from AHU, FCU, ducted AC, package AC or central AC systems to occupied spaces.

Spiral return air ducts and oval return air ducts collect indoor air and send it back to the HVAC unit for filtration and cooling.

Spiral fresh air ducts and oval fresh air ducts bring outdoor air into HVAC and ventilation systems.

Spiral exhaust ducts and oval exhaust ducts remove stale air, odor, smoke, heat or unwanted air from indoor areas.

Correct duct sizing, joint sealing, support spacing, damper adjustment and air balancing help control airflow and static pressure.

Round spiral ductwork is suitable for exposed ceiling HVAC systems, commercial interiors and ventilation systems.

Flat oval ductwork is useful for low ceiling spaces where round ducts need to be flattened without using rectangular ducting.

Spiral oval ductwork combines spiral duct forming with an oval shape for compact air distribution.

Supply air spiral duct carries conditioned air to rooms and occupied spaces.

Return air spiral duct carries indoor air back to HVAC equipment.

Exhaust spiral duct removes unwanted air, odor, heat or smoke from indoor areas.

Fresh air spiral duct brings outdoor air into the HVAC system.

Low pressure spiral ductwork is used in HVAC systems with lower static pressure requirements.

Medium pressure spiral ductwork is suitable for moderate air pressure and commercial HVAC applications.

High pressure spiral ductwork is used where higher static pressure and longer duct routes are required.

Insulated spiral duct helps reduce heat gain, condensation and energy loss.

Acoustic spiral ductwork helps reduce air noise and duct-borne sound.

Exposed spiral ductwork is used in modern office interiors, showrooms, restaurants and industrial-style commercial spaces.

Commercial spiral ductwork is used in offices, malls, hotels, restaurants and showrooms.

Industrial spiral ductwork is used in factories, warehouses, workshops and ventilation systems.

Commercial spiral ductwork and oval ductwork support air conditioning and ventilation in offices, malls, hotels and business spaces.

Spiral ductwork for office HVAC is suitable for open ceiling interiors, meeting rooms, work areas and reception spaces.

Hotels use spiral and oval ductwork for lobbies, restaurants, banquet halls, corridors and service areas.

Hospitals use spiral and oval HVAC ducts for air distribution, ventilation and exhaust applications.

Shopping malls use spiral ducting and oval ducting systems for large air volume distribution.

Restaurants use spiral ducts for exposed ceiling design, fresh air ventilation and exhaust systems.

Showrooms use exposed spiral ductwork for clean air distribution and modern interior appearance.

Airports use spiral and oval ducts for large-area ventilation and air conditioning systems.

Factories use industrial spiral ductwork for ventilation, exhaust and air movement systems.

Warehouses use spiral ductwork and oval ductwork for ventilation and air distribution across large spaces.

Data centers use ductwork for cooling airflow management and equipment room ventilation.

Cleanrooms use ductwork where controlled airflow and filtration coordination are required.

Pharmaceutical facilities use spiral and oval ducts for HVAC, ventilation and exhaust systems.

Central AC systems use spiral or oval ductwork to distribute conditioned air across multiple zones.

Exposed spiral ductwork is ideal for modern commercial interiors where ducts remain visible.

Industrial ventilation systems use spiral and oval ducts for exhaust, fresh air and process air movement.

Airflow CFM requirement determines the required spiral duct size and air quantity for each zone.

Spiral duct diameter is selected based on airflow, velocity, pressure drop and system layout.

Air velocity affects noise, comfort and pressure drop inside the spiral duct.

Static pressure shows the resistance to airflow inside the ductwork system.

Pressure drop occurs due to duct length, bends, fittings, dampers and air outlets.

Spiral seam quality affects duct strength, leakage control and long-term performance.

The duct route should reduce unnecessary bends, long runs and airflow restrictions.

Too many bends and transitions can increase pressure drop and reduce airflow performance.

Noise control depends on duct velocity, acoustic lining, equipment vibration and diffuser selection.

Duct gauge or sheet thickness is selected based on pressure class, duct diameter and strength requirement.

Correct support spacing prevents sagging, vibration and duct movement.

Insulation is required where heat gain, condensation or energy loss may occur.

Access doors and service space should be planned for inspection, cleaning and maintenance.

Airflow requirement is calculated based on cooling load, ventilation need, room size and occupancy.

Spiral duct diameter is calculated using airflow, air velocity and pressure drop.

Oval duct width and height are selected based on airflow, equivalent diameter and space limitation.

Duct area calculation helps confirm whether the selected duct size can carry the required air volume.

Equivalent diameter helps compare oval or non-round ducts with round duct airflow performance.

The velocity method selects duct size based on target air velocity and airflow CFM.

The equal friction method maintains similar pressure loss per duct length across the system.

The static regain method is used in larger duct systems to manage pressure recovery.

Pressure drop calculation helps select fan capacity and maintain airflow performance.

Final duct size is selected after checking airflow, velocity, pressure drop, space, noise and system layout.

Our team checks ceiling space, equipment location, duct route, support points, access and site conditions.

HVAC drawings are reviewed to confirm duct route, duct size, diffuser locations, damper placement and insulation scope.

Duct route is marked on site before installation.

Supports and hangers are installed to hold spiral and oval ducts safely.

Duct sections are lifted, aligned and fixed as per approved layout.

Duct joints are sealed to reduce air leakage and improve HVAC performance.

Elbows and bends are installed where the duct route changes direction.

Volume control dampers, fire dampers or smoke dampers are installed where required.

Access doors are installed for duct inspection, cleaning and maintenance.

Diffusers and grilles are connected to spiral or oval ductwork directly or through flexible duct connections.

Duct insulation and cladding are installed to reduce heat gain, condensation and energy loss.

Air leakage checking confirms sealing quality at joints and connections.

Testing and commissioning confirm airflow, leakage control, damper operation, diffuser performance, noise level and system readiness.

Visual inspection checks duct alignment, supports, joints, insulation, dampers, access doors and diffuser locations.

Joint inspection checks duct connections, sealing, clamps, flanges and fittings.

Duct leakage testing checks whether air is escaping from joints, seams or duct connections.

Airflow measurement confirms actual air quantity at diffusers, grilles and duct branches.

Static pressure testing checks resistance inside the duct system.

Dampers are adjusted to control and balance airflow.

Diffuser airflow checking confirms proper room air delivery.

Air balancing ensures each room or zone receives the required airflow.

Noise and vibration checking helps identify high velocity, loose supports, fan vibration or poor connections.

The final commissioning report records inspection results, airflow readings, leakage status, balancing details and system performance.

Air leakage can happen when joints, seams or connections are not sealed properly.

Poor airflow may be caused by wrong duct size, blocked ducts, dirty filters, closed dampers or leakage.

High static pressure can happen due to undersized ducts, excessive bends, blocked filters or poor duct design.

Duct noise may be caused by high velocity, poor duct sizing, loose fittings or lack of acoustic treatment.

Duct vibration can occur due to loose supports, equipment vibration or poor connection.

Loose joints can cause leakage, vibration and poor airflow.

Damaged insulation causes cooling loss, condensation and reduced energy efficiency.

Condensation can happen due to missing insulation, damaged insulation or high humidity.

Incorrect duct sizing can cause poor airflow, high pressure drop, noise and comfort issues.

Poor air balancing creates uneven cooling and inconsistent airflow across rooms or zones.

Damaged dampers affect airflow control and room comfort.

Blocked diffusers or grilles reduce airflow and affect cooling performance.

Improper support spacing can cause duct sagging, misalignment and vibration.

GI spiral duct, galvanized spiral duct, stainless steel spiral duct, aluminium spiral duct and MS spiral duct have different cost levels.

Sheet gauge or thickness affects duct strength, pressure rating and fabrication cost.

Larger spiral duct diameter or oval duct size requires more material and may increase cost.

Total duct quantity depends on building size, duct route, number of zones and air distribution layout.

More elbows, bends, transitions and reducers increase fabrication and installation effort.

Dampers, access doors, collars, reducers, transitions, diffusers and grilles affect total project cost.

Volume control dampers, fire dampers, smoke dampers and access doors add to project scope.

Insulation material, thickness, acoustic lining and cladding affect total ductwork cost.

Custom sizes, oval forming, special fittings and exposed finishing can increase fabrication complexity.

High ceiling work, exposed installation, tight access, scaffolding and site restrictions can affect installation cost.

Leakage testing, airflow measurement, static pressure testing and air balancing affect project scope.

Cleaning, insulation repair, leakage repair, damper repair and AMC requirements affect long-term cost.

Our team understands spiral ductwork, oval ductwork, duct fabrication, duct installation, duct insulation, leakage testing and air balancing.

We provide spiral and oval duct services for offices, hotels, hospitals, malls, restaurants, airports, factories, warehouses and commercial HVAC projects.

We focus on airflow CFM, duct size, velocity, static pressure, pressure drop, seam quality, fittings, dampers and diffuser placement.

From design and fabrication to supply, installation, insulation, cleaning, repair, replacement and AMC, Zenvent Engineering provides complete support.

Our spiral and oval ductwork solutions are designed for smooth airflow, reduced leakage, lower noise, better appearance and long-term HVAC efficiency.