Have a detailed look of the machine and it's most powerful features


Automation system

"e-conomizer" with "2 stage thermodynamic heat recovery technology"- recovering up to 100% of the extract heat/cool/humidity.

Rotary heat exchanger

For all of the units of the type max.e3 are used air-to-air rotary heat exchanger

Heat pump

No additional water, electric or DX heating/cooling coils are needed in the max.e3,


max.e3 use EC Blue (Electronically Commutated) Plug Fans - with EC Drive Technology and direct driven wheel Cpro from Ziehl-Abegg.

360° view

Have a 360 degrees look at our machine. And some more info.


Learn more about what the main advantages of hybrid HVAC solutions for fresh air treatment
  • 3E - Concept
  • 2 Stage Heat/Cool
  • All in 1
  • 100% Factory tested
  • 100% Plug and play

1е - Every Climate – from -25°C to +60°C

2е - Every Application – suitable for every application where 100% fresh air is needed, by means of covering all possible air treatment processes:

    Recirculation – 0÷100%
    Heat recovery
    Cooling + Dehumidification
    Proces Ventilation

3е - Every Installation - suitable for all types of mounting, indoor (machinery rooms, technical floors, etc.) and outdoor

Recovering up to 100% of the extract heating/cooling, achieved - "consecutively" in 2 stages:

1st stage - the sorption rotary heat exchanger, recovers more than 70% of the heatig/cooling and humidity.

2nd stage -the evaporator/condenser of the air to air heat pump, recovers the rest up to 100%.

A multifunctional concept solution for fresh air (as well as for covering heating losses and cooling loads at once), which can practically solve entirely the need for Air-Conditioning, Ventilation and Heating at the project site by using only air as fluid. Thus, radiators/fan coils/cassettes, boilers, chillers/VRF systems, pipes, insulations, pumps, fittings, etc., are no longer required. It only needs a duct system, - (which already exists in every conventional system) - and the correct designing of the necessary air quantity.

High reliability and reduced installation costs, achieved by 100% factory tests - each unit is tested under factory conditions.

The test includes:
    -  Leakage check
    -  Vacuuming and loading the system with the exact refrigerant quantity
    -  Functional testing of all fans and compressors
    -  Vibrations
    -  Loading the controller's software
    -  Temperature and pressure checks
    -  Setting up the required air flow
    -  Recording all parameters of the unit on a test list

A standalone "one-piece" unit, which only needs a duct system and power supply for its start up.


Take a look at the improved technology

  • Increased Total Filtration Area(m2) by 45%.
  • Decreased Total Internal Pressure Drop (Pa) by 20÷40%
  • Sound Pressure Level, reduced up to 5 dB(A)
  • Higher Total Heating Capacity (kW) by 30÷35%
  • Precise Condensing Temperature/Pressure control during the summer mode
  • Stepless Capacity Control
  • Up to 78% humidity recovery during the winter mode
  • 30÷45% higher Total Cooling Capacity (kW)


Higher than the highest standards!
A conventional air-cooled heat pump uses the ambient air for the evaporation process, and during the winter, this air can reach temperatures of -10°C, -15°C or even -20°C. Extracting heat from the ambient air is an inefficient process. In comparison, max.e3 uses the extract air from within the room.
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Everything you need to know about the machine’s components

  • Design

    The solutions from the max.e3 series are designed and manufactured in accordance with EN 1886 – (Ventilation for buildings-Air handling units Mechanical Performance).
    max.e3 is designed as a system with the structure of the unit, manufactured as a mono-block (from size max.e3-02 to size max.e3-18. Bigger sizes like max.e3-25, 30, 35 are produced on sections) consisting of aluminium profile, supporting elements, connection angles and locking accessories.

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  •  Rotary heat exchanger

    Rotary heat exchanger

    All of the max.e3 units use an air-to-air rotary heat exchanger- Sorption type, made from aluminium foil and 3Å molecular sieve, which gives high sensitivity for absorbing water molecules (HM1 type). Sorption rotors provide an excellent method to pre-cool and dehumidify the fresh air before entering the DX cooling coil. Temperature efficiency (Sensible) – E ≥ 70%, Humidity Efficiency – E ≤ 80%.

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  • Heat pump

    100% DX unit
    No additional water, electric or DX heating/cooling coils are needed in the max.e3, which makes it independent of other additional heating/cooling sources (boilers, chillers, VRF systems, etc.)

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     Heat pump
  • Fans


    max.e3 use ZAbluefin plug fans with latest EC Blue (Electronically Commutated) from Ziehl-Abegg. Fan wheel statically and dynamically balanced on the axis of the direct-driven motor. Fan wheel, together with the motor, is mounted on a common base frame with vibration dampers.

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  • Automation System

    max.e3 is fully equipped with all necessary automation and all executive mechanisms. The electric switchboard is integrated into the unit and located on the operation side. 
    The "Brain" of max.e3 is its specially designed by Damvent controller, which controls and manages all processes and protects the unit from eventual cut-offs.

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    Automation System
  •  Connectivity and mobility

    Connectivity and mobility

    All hybrid units allow into the corresponding connector of the ICB controller to be mounted specialized internet circuit board for internet connection. The built-in circuit board allows a permanent internet connection to max.e from any location in the world. This option helps you/us to make adequate reaction to situations requiring fast and accurate solutions to the problem.

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  • Filters

    Filters are installed at the entrance of the unit to ensure the normal operation of the AHU and to prevent contamination of the components. 
    Microcell filters are used in the units max.e3. These filters are made of plated micro-glass paper and spaced with hot melt adhesive beads, which are uniformly positioned to deliver optimum airflow. 

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Learn more about what you will save by using our hybrids
  • Initial investment costs
  • Installation costs and labor
  • Installed electric power
  • Energy and exploitation costs
  • Service and Maintenance costs
  • Time
  • Space
  • BMS

In comparison to conventional HVAC equipment, max.e3 reduces the investment costs by removing the need for: radiators/fan coils/cassettes, boilers, chillers/VRF systems, pipes, insulations, pumps, fittings and morе.

Beeing 100% Factory tested and 100% Plug and Play max.e3 reduces significant part of the labor costs.

max.e3 can reduce up to 30% the necessary installed power for HVAC system. In some cases even more.

Providing COP/EERnet = 5÷15, ensures the lowest possible energy costs for HVAC (EUR/kWh).

Maintaining only one unit instead of several, reduces significantly the maintenance cost. Filters are the only components that need to be checked, cleaned and replaced.

It saves time in designing, installation works, start-up and commissioning, service and maintenance, etc...

Whether it's installed indoor or outdoor, the absence of separate (VRF/Chiller), additional pipes, provide "clean roofs" for the buildings.

Significantly reduces the costs for a BMS system regarding its HVAC part.

Capital Cost Comparison

Hybrid AHU with implemented heat pump automation and control system

Traditional Systems
  • AHU with DX/water section
  • Outside mounted air-cooled heat pump
  • Boiler for the water systems – for working on very low outside temperatures
  • Pipes, fastenings, isolation, etc.
  • Pumps (for water systems)
  • Extra Labor
  • Common automation and controlling system
  • Higher installed power electricity capacity – higher costs for wiring
  • Higher BMS costs – two or more systems
  • More space for installation

Technical data

All max.e units are subject of continuing improvement and future development! Following its policy of continuous improvement, Damvent Ltd. reserves the right to make any further changes without the need to inform its customers and partners! Damvent shall not be responsible for any direct or indirect losses, expenses, costs, or damages of whatsoever nature, arising out of or resulting from the use of any technical data, drawing or selection software available on this website.

AHU Type min/max airflow [m3/h] max.e3-02 1000/2000 max.e3-03 2000/3200 max.e3-04 2000/4000 max.e3-06 4000/7000 max.e3-09 5500/10000 max.e3-15 9000/15000 max.e3-18 13000/18000 max.e3-25 20000/25000 max.e3-30 20000/30000 max.e3-35 30000/35000

Files to download

You can download the general overview and dimensions of the units in Revit Family, AutoCAD and PDF files.

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Our other products

You can download the Autocad files of the machines here.


World`s 1st single/common concept to provide Simultaneously heating, cooling and 100% fresh air (Ventilation) within ambient temperature range -30оC to +50oC with only 1 external unit (VMF).

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is designed to maintain T/RHsupply (°C/%) around the world,throughout the whole year, passing through different modes absolutely automatically

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max.e2 - Hybrid AHU with "2 stage thermodynamic heat recovery technology"- recovering up to 100% of the extract heat from the room.

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