Non-Ducted Ventilation Systems

Where there is no space for ducts, ductless systems provide ventilation directly through walls and roofs.

Non ducted ventilation retrofit projects add ventilation to existing buildings with minimal disruption.

Roof extractors, wall fans, and HVLS fans ventilate large open spaces efficiently.

Ductless systems cost less to install than full ducted systems.

Wall-mounted exhaust fans provide simple ductless exhaust ventilation for toilets, kitchens, and utility rooms. A ductless kitchen exhaust fan removes cooking heat and odours directly through the wall.

Wall-mounted fresh air fans with filters provide ductless supply ventilation.

Through-wall ventilation units and wall mounted ventilation units ventilate individual rooms. Many include ductless heat recovery ventilation, using ceramic or plate cores.

Powered roof extractors remove hot air and fumes from factories and warehouses.

Turbine ventilators use wind and stack effect to exhaust hot air with zero electricity.

Jet fans push air across basements toward exhaust shafts, replacing ducted car park systems.

Large axial fans move high air volumes in industrial spaces.

Evaporative coolers and air washers cool and ventilate factories and warehouses.

High-volume, low-speed fans circulate air across large spaces for comfort.

Louvres and ridge vents support natural ventilation through buoyancy and wind.

Jet fans mounted under the ceiling create high-velocity air jets that push air across the car park toward exhaust shafts and fans.

In normal mode, fans remove vehicle fumes. In fire mode, they help clear smoke to support firefighting and evacuation.

CO and NO₂ sensors run fans only when needed, saving energy.

Computational fluid dynamics (CFD) analysis helps optimise jet fan placement for effective air movement and smoke control.

Jet fans eliminate bulky ducts, improving headroom, saving space, and simplifying construction.

Roof units remove hot air that rises to the roof.

Wall fans create cross ventilation across the shop floor.

Evaporative systems cool incoming air, improving comfort in hot climates.

HVLS fans create gentle air movement for worker comfort.

Targeted exhaust removes heat and fumes from machines and processes.

ASHRAE 62.1 sets minimum ventilation rates for commercial spaces.

The National Building Code of India (NBC 2016) specifies ventilation requirements, including for basements and car parks.

The Factories Act and related state rules require adequate ventilation and working conditions in factories.

Non ducted ventilation sizing often uses non ducted ventilation ACH based on space type and use.

Fans are selected for required non ducted ventilation airflow and pressure.

Fans and louvres are placed on opposite sides to create effective cross ventilation.

Openings are sized to allow air to flow freely without excessive velocity.

Inlets and outlets are positioned so air sweeps the whole space instead of taking a shortcut.

Fans are selected for acceptable noise, and openings are protected from rain.

EC fans and VFDs reduce energy use.

Sensors run fans only when needed, as in CO2 controlled non ducted ventilation and humidity controlled non ducted ventilation.

Turbine ventilators exhaust hot air without electricity.

Combining natural and mechanical ventilation creates energy efficient non ducted ventilation.

Fans run on schedules or temperature settings.

Sensors control ventilation based on air quality.

Car park and industrial fans switch to smoke mode during fire alarms.

Non ducted ventilation BMS integration enables central monitoring and smart ductless ventilation control.

Systems work without ducts or false ceilings.

Ductless systems cost less to install.

Installation is faster with minimal disruption.

Existing buildings can be ventilated easily.

Fans and louvres are easy to access and service.

Roof extractors, jet fans, and HVLS fans work well in large spaces.

Rooms far from external walls may not be ventilated effectively.

Airflow depends on fan and opening placement.

Filtration is simpler than in ducted systems.

Fans mounted in walls may be audible indoors.

Openings need proper weather protection.

Compress India designs non-ducted systems to manage these limitations effectively.

Wall exhaust fans remove odours and moisture.

Jet fan systems ventilate car parks and support smoke clearance.

Wall fans, roof extractors, and evaporative coolers remove heat and fumes.

Roof ventilators and HVLS fans ventilate large storage areas.

Wall fans and louvres remove heat from equipment rooms.

Exhaust and fresh air fans keep kitchens ventilated.

HVLS fans and fresh air fans improve comfort.

Residential non ducted ventilation includes exhaust fans and single room ventilation units.

Non ducted classroom ventilation and fresh air fans keep spaces healthy. Non ducted office ventilation and hotel room decentralized ventilation serve similar needs in commercial buildings.

Kruger offers wall, roof, axial, and jet fans for commercial and industrial ventilation.

Systemair offers fans and ventilation units, including jet fans.

Nicotra Gebhardt offers fans for ventilation applications.

Greenheck offers fans, louvres, and ventilation products.

Almonard is an Indian manufacturer of ventilation fans for commercial and industrial use.

Havells and Crompton offer domestic exhaust and ventilation fans for homes and small spaces.

Other manufacturers also offer quality products. Compress India recommends the best-fit brand for your project.

Fan blades and motors are cleaned to maintain airflow.

Bearings and belts are checked and replaced as needed.

Louvres, shutters, and screens are cleaned.

Filters on fresh air fans are cleaned or replaced.

Sensors and controls are calibrated and tested.

Causes: dirty fans, blocked louvres, or undersized fans.

Solution: Clean fans and louvres, or upgrade capacity.

Causes: imbalance, loose mounting, or worn bearings.

Solution: Balance fans, secure mountings, and replace bearings.

Causes: faulty shutters or poor weather protection.

Solution: Repair shutters and add hoods or cowls.

Causes: poor placement or insufficient capacity.

Solution: Relocate or add fans.

Causes: poor air distribution.

Solution: Add roof extractors, wall fans, or HVLS fans.

Causes: wear, dust, or electrical faults.

Solution: Repair or replace motors.

Causes: dirt or mechanical wear.

Solution: Clean or replace shutters.

EC fans save energy and run quieter.

Filtered fans improve indoor air quality.

Jet fans can replace older ducted car park systems, improving headroom.

Sensors reduce energy use.

Domestic fans, industrial fans, roof extractors, and through-wall units vary widely in cost.

Jet fan systems include fans, exhaust fans, sensors, controls, and CFD design.

Openings, mounting, weatherproofing, and wiring form the installation cost.

Space size, number of fans, controls, fire integration, and site conditions all affect the final cost.

Share your requirements with Compress India to receive an accurate quotation.