Balanced Ventilation Systems

Balanced ventilation delivers the right amount of fresh air and removes the right amount of stale air, in a controlled way.

Equal supply and exhaust CFM keeps the building pressure neutral, avoiding drafts, whistling doors, and uncontrolled infiltration.

Recovery cores and wheels reclaim energy from exhaust air, reducing the cost of conditioning fresh air.

Filtered fresh air, controlled humidity, and lower CO₂ create a healthier, more comfortable indoor environment.

Balanced ventilation EC fans offer efficient, variable speed operation for both air streams.

A plate core or rotary wheel transfers energy between the air streams.

Balanced ventilation filtration, using pre-filters and fine filters, protects the core and delivers filtered fresh air ventilation.

Weatherproof louvres manage intake and discharge, placed well apart to prevent cross-contamination.

Separate duct networks carry supply and exhaust air as part of a ducted balanced ventilation system.

Diffusers distribute fresh air, while grilles collect stale air.

Balanced ventilation dampers control airflow, and bypass dampers allow free cooling when outdoor conditions are favourable.

Controllers manage fan speeds, bypass, alarms, and sensor-based ventilation.

Separate supply and exhaust fans, known as a supply fan and exhaust fan system, balance airflow without energy recovery. This is suitable where budgets are limited or recovery is not practical.

A heat recovery ventilator transfers heat only between air streams. An HRV ventilation system, sometimes called HRV balanced ventilation or a balanced HRV system, suits drier climates.

An energy recovery ventilator transfers both heat and moisture. An ERV ventilation system, or balanced ERV system, is ideal for humid climates like most of India.

Rotating wheels transfer heat, and in desiccant-coated versions also moisture, with high efficiency. They are common in AHUs and large systems.

Fixed plate cores transfer heat with no moving parts and very low cross-leakage.

Run-around coils and heat pipes transfer heat between separated air streams where cross-contamination must be avoided completely, such as in hospitals and labs.

Compact ceiling ERVs suit offices, homes, and small commercial spaces.

Dedicated outdoor air systems and AHUs with built-in recovery wheels handle large fresh air volumes efficiently.

Wall-mounted units provide balanced ventilation with recovery for individual rooms, without central ducting.

Outdoor air in much of India is hot and humid, and removing its moisture places a heavy load on AC systems.

ERVs pre-cool and dehumidify incoming air using exhaust air, cutting fresh air cooling load significantly.

By limiting moisture entering with fresh air, ERVs support balanced ventilation humidity control and comfort.

ASHRAE 62.1 sets minimum outdoor air rates based on occupancy and floor area.

The National Building Code of India (NBC 2016) specifies ventilation requirements for building types.

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

The Energy Conservation Building Code (ECBC) requires energy recovery for certain systems with high fresh air volumes, subject to its thresholds and exceptions.

Balanced ventilation with energy recovery supports indoor air quality and energy performance credits under IGBC and LEED.

Balanced ventilation sizing starts with fresh air requirements based on occupancy and area, defining balanced ventilation CFM.

Balanced ventilation airflow is matched between supply and exhaust, or set for slight positive pressure where needed.

Many buildings are designed for slight positive pressure to reduce infiltration of humid, dusty air.

Recovery type and efficiency are selected based on climate, fresh air volume, and energy goals.

Fans are selected for airflow and balanced ventilation static pressure across ducts, filters, and cores.

Intake and exhaust louvres are placed well apart to prevent recirculation of exhaust air.

Bypass dampers skip recovery when outdoor air is cooler and drier than indoor air.

Drains are provided where condensation may occur, and acoustic measures keep noise low. Balanced ventilation ACH targets are also checked for specific spaces.

Recovery devices reclaim a significant share of energy from exhaust air, reducing the cost of conditioning fresh air.

Variable speed balanced ventilation with EC fans reduces fan energy.

Demand controlled balanced ventilation, or CO₂ controlled balanced ventilation, adjusts airflow to actual occupancy.

ERVs can pre-treat fresh air before TFA units or AHUs, reducing their load. Together, these features create an energy efficient balanced ventilation system.

Sensors adjust ventilation based on CO₂ and indoor air quality.

Humidity sensors help control moisture levels.

Controls manage fan speeds and bypass operation for efficiency.

Alarms indicate when filters need cleaning or replacement.

A balanced ventilation system with BMS integration provides central monitoring and control.

Both air streams are controlled for consistent ventilation.

Balanced airflow avoids pressure problems.

ERVs reduce the energy needed to cool and dehumidify fresh air.

Incoming air is filtered, improving balanced ventilation indoor air quality.

ERVs limit moisture entering the building.

Well-designed systems operate quietly and comfortably.

Energy recovery supports ECBC, IGBC, and LEED objectives.

Two fans, recovery cores, and dual ducting increase upfront cost.

Separate supply and exhaust ducts need more space.

Filters and cores need regular cleaning.

Two fans consume more fan energy, which is offset by recovery savings.

Poor design or maintenance can allow odour carryover.

Compress India designs every system to manage these limitations effectively.

Office balanced ventilation and commercial balanced ventilation improve air quality and reduce AC costs. A balanced ventilation system for commercial buildings is one of the smartest fresh air investments.

School balanced ventilation keeps CO₂ low and students alert.

Healthcare balanced ventilation supports clean, comfortable environments, with suitable recovery types to avoid cross-contamination.

Hotel balanced ventilation delivers fresh air to rooms and public areas efficiently.

Residential balanced ventilation and whole house balanced ventilation systems provide filtered fresh air in sealed homes.

High occupancy spaces need high fresh air rates, which recovery makes affordable.

Variable occupancy spaces benefit from demand-controlled balanced ventilation.

Balanced ventilation supports large crowds and controls odours.

Energy recovery supports green building certification.

Daikin's VAM heat reclaim ventilation units are widely used for balanced fresh air with energy recovery.

Mitsubishi Electric's Lossnay range offers energy recovery ventilators for commercial and residential use.

Panasonic offers energy recovery ventilators for homes and commercial spaces.

Systemair offers air handling units and ventilation units with heat recovery.

Kruger offers fans and ventilation units suitable for balanced ventilation systems.

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

Filters are cleaned or replaced regularly, which is especially important in dusty cities.

Cores and wheels are cleaned to maintain recovery efficiency.

Fans and motors are inspected and maintained.

Wheel belts and motors are checked and replaced as needed.

Dampers and sensors are checked and calibrated.

Ducts are cleaned periodically to remove dust.

Causes: clogged filters, fan faults, or incorrect settings.

Solution: Clean filters, service fans, and rebalance airflow.

Causes: dust buildup.

Solution: Clean filters and cores regularly.

Causes: wheel leakage, poor seals, or intake and exhaust too close together.

Solution: Check seals, use purge sections, and separate louvres.

Causes: humid air on cold surfaces.

Solution: Improve insulation and drainage.

Causes: fan imbalance or high duct velocity.

Solution: Balance fans and add silencers.

Causes: wear and lack of maintenance.

Solution: Replace belts and motors, and schedule regular checks.

Causes: sensor drift or wiring issues.

Solution: Calibrate or replace sensors and check wiring.

ERVs can be added to existing buildings to improve fresh air and reduce AC load.

Adding supply fans and recovery converts exhaust-only systems to balanced ventilation.

Recovery wheels can be added to existing AHUs.

EC fans and CO₂ controls improve efficiency.

Higher airflow needs larger units and ducts, which increases cost.

ERVs generally cost more than HRVs but deliver greater savings in humid climates.

Dual duct networks, insulation, louvres, and controls form a large part of the cost.

Energy savings from reduced AC load help recover the higher upfront cost over time, depending on operating hours, fresh air volume, and climate.

Share your building details with Compress India to receive an accurate balanced ventilation system price and savings estimate.