Manufacturer Custom AHU

Including custom HRV

In scenarios where facility shutdown is impractical, ER Flow excels in manufacturing Custom Air Handling Units (AHU) and Heat Recovery Ventilation (HRV) systems.

Our Custom AHUs can be delivered in pre-agreed dimensions or pallets for on-site assembly, ideal for sensitive environments like hospitals or areas with logistical constraints.

Our engineers leverage extensive experience in HRV implementation, achieving up to 90% energy recovery without compromising indoor air quality.

Custom AHU on the roof

Custom-Packaged Air Handling Units

Guide Specification

ER Flow offers this guide to aid in the preparation of design specifications for design/build projects. The guide is rooted in the widely accepted CSI MasterFormat. As an increasing number of construction projects are now carried out on a design/build basis instead of through hard bids, it is crucial to have a readily available resource of design options to meet the criteria of design engineers.

All HVAC specifications fall under the MasterFormat Division:

23 00 00 Heating, Ventilating, and Air Conditioning (HVAC). The general description of custom-packaged air-handlers is either
23 73 00 Indoor Central-Station Air-Handling Equipment
23 75 00 Custom-Packaged Outdoor HVAC Equipment.

Each of these divisions has multiple options that follow, and there are additional CSI MasterFormat categories for specifying integral equipment in the unit.
23 72 00 Air-to-Air Energy Recovery Equipment would be used to provide specifications for Heat-Wheel, Heat-Pipe or Fixed-Plate Air-to-Air Energy Recovery Equipment.
23 76 00 Evaporative Air-Cooling Equipment would be used to provide specifications for all evaporative cooling hardware.

The products manufactured by ER Flow fall within the Writing Section
23 75 00 Custom-Packaged, Outdoor, Central-Station Air-Handling Units and 23 73 23 Custom Indoor Central-Station Air Handling Units.

Within Section 23 75 00 there are sub-categories:

23 75 13 Custom-Packaged, Outdoor, Central-Station Air-Handling Units
23 75 13.01 Custom-Packaged Outdoor, Central-Station Air Handling Unit with Heating, Cooling and Energy Recovery
23 75 16 Custom-Packaged, Rooftop Air-Conditioning Units
23 75 23 Custom-Packaged, Heating and Ventilating Makeup-Air Units
23 75 33 Custom-Packaged, Outdoor, Heating and Cooling Makeup Air-Conditioners.

The provided equipment or parts must comply with or meet the requirements of the following regulatory organizations, regulations or standards:

AHRI 260          Sound Rating of Ducted Air Moving and Conditioning Equipment.

AHRI 430          Standards for Central Station Air Handling Units.

AHRI 920          Performance Rating of DX – Dedicated Outdoor Air System Units.

AHRI 1060        Performance Rating of Air-To-Air Energy Recovery Ventilation Heat Exchangers.

AMCA 500-D     Laboratory Methods of Testing Dampers & Louvers for Rating.

ANSI Z83.4       Non-Recirculating Direct Gas-Fired Heating and Forced Ventilation Appliances For Commercial and Industrial Application.

ANSI Z83.8       Gas Unit Heaters, Gas Packaged Heaters, and Gas Utility Heaters.

ANSI/UL 900     Standard for Air Filter Units.

ASHRAE 52.2   Method of Testing General Ventilation Air-Cleaning Devices for Removal Efficiency by Particle Size.

ASHRAE 62.1   Ventilation for Acceptable Indoor Air Quality.


ASHRAE 84      Method of Testing Air-to-Air Heat/Energy Exchangers.

ASHRAE 90.1   Energy Standard for Buildings Except Low-rise Residential Buildings.

ASTM B209      Aluminum and Aluminum Alloy Sheet and Plate.

ASTM E-84       Surface Burning Characteristics of Building Materials.

CSA 2.6            Gas Unit Heaters, Gas Packaged Heaters, and Gas Utility Heaters.

CSA 3.7            Non-Recirculating Direct Gas-Fired Heating and Forced Ventilation Appliances For Commercial and Industrial Application.

CSA C22.2       Heating and Cooling Equipment.

NEMA               National Electrical Manufacturers Association.

SMACNA          HVAC Duct Construction Standards, 3rd Edition – 2005.

SMACNA          HVAC Air Duct Leakage Test Manual.

UL 181             Mold Growth and Humidity Test.

UL 1995           Heating and Cooling Equipment.

What Do We Offer?

You can achieve savings of 30 to 50% when compared to OEM solutions.
We offer solutions for the needs of commercial air handling units and retrofitting. Whether you require a chilled water coil, hot water coil, steam coil, steam distribution coil, condenser coil, or evaporator coil, ER Flow provides a product range for retrofitting.

Reach out to ER-Flow with your inquiries; we work in partnership with you to achieve outstanding results.
Our team of experts is always ready to offer prompt and professional assistance in selecting the ideal heat exchangers that suit your needs.

    Contact Us

    +1 855-8-ER FLOW

    Scroll to Top