Mechanical Supply Ventilation Systems

People breathe out CO₂. In crowded or sealed spaces, CO₂ levels rise quickly, causing drowsiness and poor concentration. Indoor air quality ventilation keeps CO₂ within healthy limits.

Fresh air dilutes odours, VOCs from furniture and finishes, and other indoor pollutants.

Building positive pressure stops unfiltered air, dust, and insects from entering through gaps, doors, and windows.

Good ventilation reduces health complaints and improves comfort, concentration, and productivity.

Weatherproof louvres and bird screens form the outdoor air intake, keeping rain, birds, and debris out.

Pre-filters, fine filters, and HEPA filters where needed form the fresh air filtration system.

Inline supply fans suit ducted systems in ceiling voids. Centrifugal supply fans handle higher static pressure. Axial supply fans move large volumes at low pressure. EC supply fans offer energy-efficient variable speed. A roof mounted supply fan suits buildings with rooftop space.

Packaged fresh air units combine filters, fans, and coils. Treated fresh air units and fresh air handling units cool and dehumidify outdoor air.

Insulated ductwork carries air to fresh air diffusers and supply air grilles in each room.

Volume control dampers balance airflow. A motorized fresh air damper, or outdoor air damper, opens and closes automatically. Fire dampers maintain fire compartmentation.

Duct silencers and acoustic lining reduce fan noise.

Relief dampers prevent over-pressurisation, and controls manage fan speed, schedules, and alarms.

A fresh air supply fan delivers outdoor air through a short duct or wall opening. It suits small rooms and basic needs.

A fresh air supply fan with filter delivers cleaner air, which is ideal for offices, homes, and schools in polluted cities.

TFA units cool and dehumidify fresh air before supply, reducing humidity and AC load in air conditioned buildings.

Building pressurisation systems maintain positive pressure in hospitals, cleanrooms, labs, and sensitive areas. Cleanroom positive pressure ventilation keeps contaminants out.

A make up air system replaces air removed by exhausts, such as kitchen hoods. A kitchen makeup air system, or positive pressure makeup air, prevents negative pressure, odour migration, and poor exhaust performance.

Life-safety pressurisation systems keep escape staircases and lift wells smoke-free during fires, as required by fire codes.

ASHRAE 62.1 sets minimum outdoor air rates for commercial and institutional spaces, based on occupancy and floor area.

The National Building Code of India (NBC 2016) specifies ventilation and fresh air requirements for different building types, including life-safety pressurisation.

The ISHRAE IEQ standard provides Indian guidelines for indoor air quality, thermal comfort, and ventilation.

Compress India designs every system to meet applicable codes and project requirements.

Fresh air requirement calculation uses occupancy and floor area as per applicable standards to determine fresh air CFM.

Some spaces are designed by ventilation air changes per hour, especially factories, warehouses, and utility rooms.

Pressure levels are set based on the application, such as cleanrooms, hospitals, or general buildings.

Supply fan sizing accounts for supply ventilation airflow and supply fan static pressure, including filters, ducts, and diffusers.

Ducts are sized for low velocity and low noise.

Intakes are placed away from exhausts, DG stacks, kitchen outlets, and traffic to avoid pulling in polluted air.

Fan selection, silencers, and vibration isolation keep noise within acceptable limits.

G4 pre-filters capture larger dust particles and protect downstream filters.

F7 and F9 fine filters capture a large share of fine particles, including PM2.5.

HEPA filters are used in hospitals, cleanrooms, and pharma facilities.

In high-pollution cities, multi-stage filtration with G4 and F7 or F9 filters is recommended for effective PM2.5 protection.

EC fans and a supply fan VFD adjust airflow as a variable speed supply fan, reducing energy use.

Demand controlled ventilation with CO₂ controlled fresh air adjusts airflow based on actual occupancy.

TFA units handle fresh air humidity control and cooling efficiently, reducing the burden on room AC units.

For large air conditioned buildings with high fresh air volumes, balanced ventilation with ERVs can recover energy from exhaust air. An energy efficient supply ventilation design considers this option.

Fans run on schedules matched to occupancy.

Sensors adjust fresh air based on CO₂ and indoor air quality.

Alarms indicate when filters need cleaning or replacement.

Fans shut down or switch to smoke control modes during fire alarms.

Supply ventilation BMS integration provides central monitoring and control. Mechanical supply ventilation with BMS integration improves management and energy savings.

Fresh air is delivered in the right quantity and filtered before it enters.

Positive pressure blocks unfiltered air, dust, and insects.

Fresh air dilutes CO₂ and odours.

Positive pressure reduces air leaking in through gaps.

Supply ventilation is simple to design, install, and maintain.

Healthier air improves wellbeing and productivity.

Hot, humid outdoor air adds to AC load unless treated with TFA units.

Without relief paths, over-pressurisation can cause doors to be hard to open and airflow to drop.

Supply only systems do not recover energy from exhaust air.

Poor fan selection or duct design can cause noise.

Compress India designs every system to address these limitations.

An office fresh air supply system, or commercial fresh air system, improves air quality and productivity. Mechanical supply ventilation for commercial buildings is essential in sealed, air conditioned offices.

Hospital supply ventilation maintains fresh air and positive pressure in clean areas.

Cleanrooms use filtered, positive pressure ventilation to control contamination.

Fresh air keeps classrooms healthy and students alert.

Filtered fresh air systems improve indoor air in sealed homes in polluted cities.

Fresh air and make-up air keep hotels and restaurants comfortable and odour-free.

Fresh air supports large crowds and keeps shoppers comfortable.

Industrial supply ventilation, industrial fresh air supply, and warehouse supply ventilation remove heat and fumes and improve working conditions.

Supply ventilation removes heat from electrical and DG rooms and provides combustion air.

Pressurisation systems keep escape routes smoke-free during fires. Car park supply ventilation works alongside exhaust systems in basements.

Kruger offers a wide range of centrifugal, axial, and inline fans for commercial and industrial ventilation.

Systemair offers fans, air handling units, and ventilation solutions for commercial buildings.

Nicotra Gebhardt offers centrifugal and plug fans for HVAC and ventilation applications.

ebm-papst is known for EC fans and energy-efficient motor technology.

Greenheck offers fans, dampers, louvres, and ventilation products.

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

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

Filters are cleaned or replaced regularly, which is critical in dusty and polluted cities.

Fans, motors, belts, and bearings are inspected and maintained.

Dampers and louvres are cleaned and checked for smooth operation.

Ducts are cleaned periodically to remove dust buildup.

CO₂ sensors and controls are calibrated and tested.

Causes: clogged filters, damper issues, or fan faults.

Solution: Clean filters, check dampers, and service fans.

Causes: damaged or low-grade filters, or dirty ducts.

Solution: Replace filters, upgrade filter grades, and clean ducts.

Causes: fan imbalance, worn bearings, or high duct velocity.

Solution: Balance fans, replace bearings, and add silencers.

Causes: untreated humid fresh air.

Solution: Add TFA units or dehumidification.

Causes: insufficient relief paths.

Solution: Add relief dampers and rebalance airflow.

Causes: intake near exhausts or pollution sources.

Solution: Relocate the intake or add suitable filtration.

Causes: motor, bearing, or electrical faults.

Solution: Repair or replace the fan and add standby fans for critical areas.

Fresh air systems can be added to existing air conditioned buildings to improve air quality.

Upgrading to F7 or F9 filters improves protection from fine particles.

CO₂ sensors and VFDs reduce energy use while maintaining air quality.

TFA units or ERVs improve comfort and energy efficiency.

Replacing old fans with EC fans saves energy and improves control.

Higher airflow requires larger fans, filters, and ducts, which increases cost.

Fan type, filter grades, commercial HVAC duct supplies, insulation, and diffusers form a large part of the cost.

TFA units, controls, BMS integration, fire dampers, acoustic treatment, and site conditions all affect the final price.

Share your building details with Compress India to receive an accurate quotation.