Why Two ERVs With the Same Efficiency Are Not the Same

Reading time: 3 minutes

Efficiency

July 31

Why ERV Ratings Don’t Tell the Whole Story: What Really Impacts Performance

Specifying an ERV may seem straightforward when units appear similar on paper, but ventilation efficiency differences matter in practice. However, efficiency ratings alone do not guarantee effective system operation.

Selecting an ERV requires understanding ventilation efficiency, design, and build quality. This includes knowing how different technologies, construction, and controls combine. These factors ensure reliable performance in buildings and help create better air everywhere.

Key Performance Factors Beyond ERV Efficiency

While efficiency is important, ventilation specifiers and installers must also evaluate other factors that impact system performance, including:

Fan type (EC or AC): Determines how well the unit handles static pressure conditions and impacts performance.

Fan power and media pressure loss: Affects energy use and operational efficiency.

Energy recovery type and filtration selection: Changes airflow resistance and influences overall ventilation performance.

Casing durability and thermal breaks: Reduces heat loss, sweating, and thermal bridging in extreme climates.

Proper controls and commissioning: Ensures systems operate correctly and maintain specified performance levels.

Frost prevention: Protects wheels and maintains heat recovery in cold climates, supporting reliable year-round operation.

These considerations help ensure ERVs perform as expected and set the stage for understanding other installation and sizing factors.

Installation and Operating Conditions Impact ERV Efficiency

When selecting and installing ERVs, specifiers must also consider installation quality. Improper installation can cause leaks that lower BTU output and ventilation efficiency. These leaks move conditioned air into mechanical rooms or unoccupied spaces instead of intended zones, forcing units to run longer and use more energy.

Incorrect sizing strains ERVs, raising energy use and reducing service life. Proper sizing needs to consider space, usage type, and occupancy to maintain effective ventilation and system performance. Considering frost prevention in cold climates is also critical to protect wheels and maintain consistent energy recovery.

Systemair ERV Design and Build Quality for Long-Term Performance

Systemair Topvex TR and FR units include integrated controls programmed for application-specific performance. Their construction supports design CFM with low fan power to maintain ventilation efficiency. Topvex uses controls coded specifically for its units. This approach keeps fans running efficiently and extends their service life.

Bagged filters offer an advantage in Topvex. The large surface area reduces static pressure, lowers energy use, and extends filter life. The G90 casing resists rust and damage longer than standard galvanized metal. Non-proprietary internal components simplify replacements and support easier service scheduling.

Topvex units also include a wheel design that reduces odor transfer between exhaust and supply air streams. This benefit is particularly useful in facilities with strong smells, such as casinos or commercial kitchens.

Key features include:

Integrated sequencing controls for installation ease

Single-side service access for mechanical rooms with limited space

Long-lasting wheel design

Three-year standard warranty for added peace of mind

This design and build approach supports Topvex ERV performance and reduces maintenance needs.

Create Better Air Everywhere with Systemair Topvex

Efficiency is only one factor. Design, installation, and build quality also have an impact on ERV performance. Systemair Topvex units help deliver better air everywhere.

Learn more about Topvex to see how these ERVs can support reliable ventilation in your projects.

Want to learn more?

Discover our Topvex line of products, and find the right solution for each of your projects.

See the Topvex Product LIne