Lenox Hill Hospital HVAC Retrofit | Return Fan EC Fan Wall Upgrade
Lenox Hill Hospital HVAC Retrofit | Return Fan EC Fan Wall Upgrade
Apr 16, 2026
Intro
Lenox Hill Hospital required a return fan retrofit in New York City to replace an older blower arrangement within an existing hospital air handling section.
GRR Cooling Experts completed this hospital HVAC retrofit using a direct-drive EC fan wall solution designed for 25,000 CFM at 2.5" static pressure. The installed configuration used 3 direct-drive EC motor fans, matched to 208V / 3-phase power, with a dedicated indoor power and control panel.
In a live healthcare environment, return fan replacement has to do more than restore airflow. The solution must fit the existing section, integrate cleanly into the system, and support dependable long-term operation.
The challenge
Older hospital air systems rarely allow simple one-for-one replacement logic. Existing section geometry, available power, service access, and operating requirements all affect what can be installed successfully.
For this project, the return section had to be modernized in a way that met the required duty point while working within the realities of the existing unit.
The solution
GRR Cooling Experts implemented a direct-drive EC fan wall retrofit built around the return section’s required airflow and static conditions.
The project scope included:
🔷 removal of the existing blower assembly
🔷 fabrication and installation of a new galvanized mounting panel
🔷 installation of the new EC fan wall
🔷 installation of a new electrical panel
🔷 reconnection to the new system
🔷 startup and operating verification
This created a more controllable and service-friendly return fan arrangement without requiring full AHU replacement.
System specifications
Airflow: 25,000 CFM
Static Pressure: 2.5" S.P.
Fan Configuration: EC fan wall
Fans: 3 direct-drive EC motor fans
Power: 208V / 3-phase
Panel: Dedicated indoor power and control panel with overload protection, alarm, and speed control
Project execution
Execution began with review of the existing blower section and operating conditions, followed by removal of the original blower assembly and preparation of the section for the new fan wall configuration.
The new EC fan wall and control hardware were then installed, integrated into the existing system, and brought through startup.
In hospital HVAC retrofit work, results depend on fit-up, coordination, and clean integration just as much as fan selection.
Result
This Lenox Hill Hospital return fan retrofit replaced an older blower arrangement with a more modern EC fan wall solution engineered for the required airflow and static conditions.
Key outcomes included:
improved controllability
better serviceability
a more retrofit-friendly return section
a stronger long-term operating path than a basic patch approach
For critical healthcare environments, the right retrofit path is the one that works in the real unit, not just on paper.
Technology and support
This project used direct-drive EC fan wall technology to create a more controllable and serviceable return fan solution for a live hospital environment.
Equipment support for the project was provided by Baikal Mechanical.
Frequently asked questions
Q: Why was this project treated as a retrofit instead of a basic replacement?
A: Because the new solution had to fit the existing return section, match the available power, and integrate into a live hospital system.Q: Why use an EC fan wall in this type of return section?
A: In the right application, an EC fan wall can provide a more controllable and service-friendly retrofit path than an older conventional blower arrangement.Q: What makes hospital HVAC retrofit more demanding?
A: Healthcare environments require dependable airflow, coordinated execution, and clean system integration under existing-building constraints.Q: What was installed on this project?
A: The retrofit used a direct-drive EC fan wall designed for 25,000 CFM at 2.5" static pressure, using 3 EC motor fans with 208V / 3-phase power and a dedicated control panel.Related resources
Request a hospital HVAC retrofit review
If your hospital or critical facility in NYC is evaluating an older return fan section, GRR Cooling Experts can help review existing conditions and define a practical retrofit path.
Intro
Lenox Hill Hospital required a return fan retrofit in New York City to replace an older blower arrangement within an existing hospital air handling section.
GRR Cooling Experts completed this hospital HVAC retrofit using a direct-drive EC fan wall solution designed for 25,000 CFM at 2.5" static pressure. The installed configuration used 3 direct-drive EC motor fans, matched to 208V / 3-phase power, with a dedicated indoor power and control panel.
In a live healthcare environment, return fan replacement has to do more than restore airflow. The solution must fit the existing section, integrate cleanly into the system, and support dependable long-term operation.
The challenge
Older hospital air systems rarely allow simple one-for-one replacement logic. Existing section geometry, available power, service access, and operating requirements all affect what can be installed successfully.
For this project, the return section had to be modernized in a way that met the required duty point while working within the realities of the existing unit.
The solution
GRR Cooling Experts implemented a direct-drive EC fan wall retrofit built around the return section’s required airflow and static conditions.
The project scope included:
🔷 removal of the existing blower assembly
🔷 fabrication and installation of a new galvanized mounting panel
🔷 installation of the new EC fan wall
🔷 installation of a new electrical panel
🔷 reconnection to the new system
🔷 startup and operating verification
This created a more controllable and service-friendly return fan arrangement without requiring full AHU replacement.
System specifications
Airflow: 25,000 CFM
Static Pressure: 2.5" S.P.
Fan Configuration: EC fan wall
Fans: 3 direct-drive EC motor fans
Power: 208V / 3-phase
Panel: Dedicated indoor power and control panel with overload protection, alarm, and speed control
Project execution
Execution began with review of the existing blower section and operating conditions, followed by removal of the original blower assembly and preparation of the section for the new fan wall configuration.
The new EC fan wall and control hardware were then installed, integrated into the existing system, and brought through startup.
In hospital HVAC retrofit work, results depend on fit-up, coordination, and clean integration just as much as fan selection.
Result
This Lenox Hill Hospital return fan retrofit replaced an older blower arrangement with a more modern EC fan wall solution engineered for the required airflow and static conditions.
Key outcomes included:
improved controllability
better serviceability
a more retrofit-friendly return section
a stronger long-term operating path than a basic patch approach
For critical healthcare environments, the right retrofit path is the one that works in the real unit, not just on paper.
Technology and support
This project used direct-drive EC fan wall technology to create a more controllable and serviceable return fan solution for a live hospital environment.
Equipment support for the project was provided by Baikal Mechanical.
Frequently asked questions
Q: Why was this project treated as a retrofit instead of a basic replacement?
A: Because the new solution had to fit the existing return section, match the available power, and integrate into a live hospital system.Q: Why use an EC fan wall in this type of return section?
A: In the right application, an EC fan wall can provide a more controllable and service-friendly retrofit path than an older conventional blower arrangement.Q: What makes hospital HVAC retrofit more demanding?
A: Healthcare environments require dependable airflow, coordinated execution, and clean system integration under existing-building constraints.Q: What was installed on this project?
A: The retrofit used a direct-drive EC fan wall designed for 25,000 CFM at 2.5" static pressure, using 3 EC motor fans with 208V / 3-phase power and a dedicated control panel.Related resources
Request a hospital HVAC retrofit review
If your hospital or critical facility in NYC is evaluating an older return fan section, GRR Cooling Experts can help review existing conditions and define a practical retrofit path.