The conception and design of ventilation systems for operating conditions with variable pollutant loads (DCV) is a modern and effective method, properly described and regulated in national and international standards (ASHRAE 62.1 – 2019 item Its use is based on real-time monitoring of the concentration of pollutants and the controlled intake of outdoor air (renovation). The use of purification systems associated with DCV minimizes the need for air renewal, contributing significantly to energy savings while ensuring high levels of indoor air quality (IAQ).

There are many situations where indoor air quality is inadequate or uncontrolled and the implementation of centralized systems is not viable. To mitigate those issues, the Indoor Air Purification process must associate the best filtering and decontamination techniques with recirculation through a planned air flow and controlled intake of filtered outdoor air when necessary, through air cleaners that are easy to install and cost effective.

Purefeel Advanced Technology

The elements that integrate purefeel® technology offer the ideal solution for most situations, increasing the degree of safety of the occupants and the processes with significant energy savings with air conditioning, while overcoming all the usual limitations of using air purifiers currently available on the market.

  • Proportional automatic control of the outdoor air intake by the equipment when necessary (DCV);
  • Automated monitoring system that manages the flows based on the cartridges saturation;
  • Real-time monitoring of pollutant concentrations under a preset range of temperature and humidity;
  • Intelligent operation cycles based on monitoring and cloud scheduling allowing high energy savings;
  • Ensure the operational integrity of the equipment avoiding its out of the original requirements.

It is an obvious finding that, in a huge number of environments under the risk of contamination, there are no suitable ventilation systems or air cleaners that meet even the minimum requirements of the current regulations, and their implementation is technically impossible and/or economically infeasible.

INTELIARTM monitoring, control and management system
Smart Indoor Air Purification Management System

INTELIAR™ is a unique Software that takes Indoor Air Quality (IAQ) to another level, overcoming the difficulties that have prevented the technique to be used more frequently in ventilation and air conditioning projects in commercial, public, industrial and health care buildings.

The technology developed by Purefeel applies a series of sensors with a unique automation software that provides all necessary conditions to ensure that the Air Purifier operates only under the specified conditions.
Sophisticated routines of Purefeel own indoor air quality analysis algorithm (IAQ-i) allow air flow optimization and minimizes outdoor air intake (DCV), with significant energy savings while facilitating operation, ensuring integrity and operational compliance.

The high degree of filtration and the controlled intake of outdoor air managed within a defined limits range of temperature and humidity variation, keep the concentration levels of pollutant under control, whether particulate (PM) or gaseous (CO2, TVOC, CH2O and three more substance possibilities to choose from).
The relationship between the reduction of infections by viruses and bacteria with the reduction of suspended airborne particulates, especially PM2.5, is widely proven in numerous scientific studies (Bacterial characterization in ambient submicron particles during severe haze episodes at Ji’nan, China; Caihong Xu, 2017). This ensures indirect monitoring of the microbiological load levels of Indoor Air.


Particulate, Gases and Microorganisms

The most advanced filtration technology is used in Purefeel´s Products and Solutions. The document “ASHRAE´s Position on Filtration and Air Cleaning“, in its Abstract, states that”… there is only significant evidence of health benefits for porous media particle filtration systems”. This statement, largely based on scientific evidence, places the mechanical filtering in a privileged position when it comes to indoor air purification.

Supported by scientific evidence, Purefeel’s Products and Solutions include at least three filtration stages:

  • a G4 Pre-Filter;
  • a F9 Fine Filter;
  • and a final HEPA H-14 absolute filter stage (EN 1822: 2009 H14/ISO 29463 ISO 45H) capable of retaining microorganisms, as small as bacteria and viruses.

The relationship between the reduction of infections through viruses and bacteria with the reduction of airborne particulates, especially PM2.5, is widely proven in numerous scientific studies (Bacterial characterization in ambient submicron particles during severe haze episodes at Ji’nan, China; Caihong Xu, 2017). Additionally, it is also possible to choose to use activated carbon filter elements for gas absorption, especially in odor control applications.

To optimize the improvement of indoor air, a proportional intake device for filtered outdoor air can also be used. A UVC source is positioned inside the clean air flow, sheltered from the access of people, avoiding, at the same time, loss of efficiency caused by dust deposited on the lamp bulbs, ozone emission in the environment and direct visual contact. The impossible task of sterilizing air in such a short exposure time within the air flow, as has been reported in other applications and models, was replaced by an innovative application that reduces the possibility of microorganisms contamination of the filter element and internal components of the equipment.

Filters have reports


Applications & Services

The criteria for dimentioning and selecting Purefeel´s Products and Solutions is based on solid engineering principles and practices.

Analysis of the filtering needs, the intake filtered outdoor air volume and the specification of the type of monitoring and control, takes the needs of each specific environment into account, considering, among others, the following aspects:

  • Pollutants and contaminants to be controlled;
  • Covered area of the purified air flow;
  • Thermal load x cooling capacity of filtered and diluted outdoor air;
  • Pollutant emissions that may come from productive or labor activities.

Purefeel´s solutions are customized one by one for the actual operating conditions based mainly on the above criteria. Thus, unique INTELIARTM technology offers maximum performance in operational integrity functions, preventing the purification systems from operating out of the original specified conditions.

These strict engineering criteria are also the basis of the advisory and consultancy services provided by Purefeel.


Planned Air Flow

One of the main characteristics of Purefeel´s Products and Solutions, especially the UPR and UPO units, is the use of a known airflow pattern defined in a computational study (CFD – Computing Fluid Dynamics) for dimensioning applications. This criteria – foreseen in the Applicable Standards (ASHRAE and – allows a much smaller volume of outdoor ventilation air to be used with equivalent or even better results in terms of Indoor Air purification. It also allows significant energy savings in air conditioning. The unique (*) design of Purefeel’s Air Diffusers allows the purified air outlet to be collimated at 180◦, 135◦ and 90◦ angles, further optimizing the air distribution in the areas of interest.

(*) Patent pending

Current lines indicating speed side view

Current lines indicating speed top view

Speed field produced by the equipment in the confined environment

Animation of the planned air flow

Technical Standards Legislation Compliance with local regulations and established international standards is an extremely important feature that sets purefeel® Products and Solutions apart from most other products available on the market. purefeel® Air Purifiers are equipped with duly certified filter elements and first-line components. Their construction fully meets the requirements of :
  • ASHRAE 62.1- 2019 – Ventilation for Acceptable indoor Air Quality
  • NBR-16401-3 – Part 3: Quality of the indoor and safety air (Brazil)
  • NR-12 – Safety at Work in Machinery and Equipment (Brazil)
  • CFR 21- part11 – FDA* regulations – Computerized Systems Validation Guide*.
Other specific international standards can also be covered by purefeel® solution. Special attention is given to Purefeel´s Products and Solutions in compliance with the safety regulations established in the Brazilian standards of the NR series (H&S), both in the design and construction of products according to the requirements of NR-12, as well as in applications and solutions that fully meet the requirements of NR-15 annex 11 and NR-33 when it comes to ventilation of confined spaces, as defined in Annex IV of the NR-33 Technical Guide prepared by FUNDACENTRO – Ventilation for Work in Confined Spaces. Proper use of Purefeel Products and Solutions ensures users, companies, institutions and owners, compliance with current legislation. In Brazil, the legal basis that supports the mandatory systematic control over Indoor Air Quality is structured on the following legislation: a) Ordinance 3.523 of 1998, Brazilian Ministry of Health; b) ANVISA Resolution – Re no. 9, 2003; c) Federal Law 13.589 of 2018;
* Compliance with these standards may not apply to all Purefeel´s product models.
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