The onset of winter marks a significant rise in air pollution. Every year, there is profound deterioration in the quality of air during the period, and this year as well, the AQI of the capital city plunged to the ‘severe category’ for eight consecutive days. Though the pollution levels have reduced in the past few days, with AQI improving marginally to 310 as per the Central Pollution Control Board records, the vulnerability to pollution still persists in the city. Additionally, experts have shown concerns about the quality slipping back to the severe category with hazy conditions still prevailing in major parts of the city and its adjoining areas.

With the capital city striving to counter the air pollution, it is important to understand that the impact is not just limited to outside but is also responsible for influencing the air quality within the enclosed spaces. The worst affected are commercial and industrial spaces facing the challenge of poor indoor air quality (IAQ) as contaminated air remains trapped within the space. Given the large and complex structure of these spaces, such as offices, schools, airports, hotels, etc., they are often marked by excessive buildup of pollutants, dust, and allergens due to packed buildings. This in turn leads to a hike in levels of PM2.5, PM10, carbon dioxide, VOCs, etc., giving rise to a range of respiratory problems such as bronchitis, asthma, and lung inflammation, along with cardiovascular issues and neurological disorders in a person. Moreover, as per the study by IIT Kanpur, the level of PM 2.5 peaks during the month of November, where the pattern continues in December as well, with pollution still being a matter of concern. With PM 2.5 levels surpassing the mark of 1000 in the 3rd week of November, it becomes essential to improve the IAQ of the large spaces. Furthermore, long-term exposure to poor IAQ has also been linked to the development of a condition called Sick Building Syndrome (SBS) among the occupants. In this condition, people complain about issues such as fatigue, headaches, lethargy, nausea, wheezing, throat irritation, etc. In addition to this, SBS is also responsible for reduced productivity and absenteeism in the person, as unhealthy indoor air can also affect the physical and mental well-being of people. However, given the inherently complicated structure of commercial and industrial spaces, improving the IAQ cannot be done alone and requires the intervention of advanced technologies. Here, installing Air Purification Systems (APS) can come in handy for maintaining good IAQ across the space by conducting the removal of outdoor air pollutants at the source itself. It offers a proactive solution with the help of a “beginning-of-the-tube” system where purification of air is performed at the source by harnessing the benefits of advanced filtration technologies. The APS systems exercise an edge over the other standard air purifiers by purging the air before it enters the facility rather than treating the outdoor air inside the building, risking the mixture of outside contaminated air with the indoor environment. In order to address the air quality issues proficiently, the APS systems employ innovative solutions in the form of honeycomb-designed chemical filters. They conduct 100% elimination of gaseous contaminants before they infiltrate indoor spaces and check the entry of harmful particulate and gaseous pollutants at multiple levels. To further fortify the process, the systems also prevent the infiltration of contaminated air into the building by maintaining positive pressure across the space. Along with this, it ensures thorough cleaning of outside air, making use of proper particulate and chemical filtration. Looking at the health repercussions of poor IAQ in large spaces, adopting advanced Air Purification Systems can go a long way in curtailing the contamination of air indoors. With rising outdoor air pollution, these systems play a crucial role in improving indoor air quality in commercial and industrial spaces by effectively preventing pollutants from entering the indoor environment.

  1. Why is proper ventilation crucial for a home?

Proper ventilation is crucial for a home, as it significantly improves the AQI of indoor air of the space. It is efficient at eliminating the indoor pollutants present in the form of dust, allergens, and volatile organic compounds (VOCs) for supplying clean and healthy air into the house. In the process, ventilation prevents excess moisture buildup in the space, which in turn impedes the growth of mould, dampness, and any structural deterioration of walls, ceilings, and furniture occurring due to humidity.

Ventilation is also important for regulating the temperature of the space. Facilitating escape of hot air, it fosters a comfortable indoor temperature by promoting circulation of cooler air within the enclosed facility. Consequently, proper ventilation plays an instrumental role in reducing the air conditioning of a house significantly. Minimizing the strain on heating and cooling systems substantially, it helps in lower utility bills and drives better energy efficiency in the house.

In addition to this, a well-ventilated house is efficient at removing the odors released from cooking, cleaning products, and other sources, disseminating a fresh and pleasant environment within the house. Along with this, it also comes in handy for getting rid of carbon monoxide generally produced by stoves, fireplaces, and heaters in the house.

 

2. What are the different types of home ventilation systems (natural, mechanical, hybrid)? How should homeowners choose the most suitable option for their property?

Looking at the importance of ventilation, there are various types of home ventilation systems for facilitating optimal supply of fresh air.

  • Natural ventilation – Natural ventilation is majorly driven by unchecked air flow through windows and doors.
  • Exhaust ventilation – This type of ventilation is very common in kitchens and bathrooms and comes in handy for removing moisture from the spaces.
  • Balanced ventilation – Balanced ventilation works on the principle of air exchange, where fresh outdoor air is introduced into the house and an equal amount of stale air is forced out. It neither pressurizes nor depressurizes, thereby ensuring proper ventilation throughout space.
  • Mechanical Ventilation – This is a heat recovery ventilation situated at the top of the building. It supplies conditioned air and bodes well for proper flow of fresh air into the rooms.

The choice of ventilation depends on several factors, such as the house layout, size, and specific goals. It is subject to the purpose that needs to be achieved, such as the removal of excess moisture, driving energy efficiency, or exhaust ventilation. But while selecting the system, size of the house should be considered; as an oversized system can prove to be inefficient and an undersized system might be insufficient to meet the ventilation needs. Likewise, for larger commercial and industrial spaces exhibiting complex structures, installing Treated Fresh Air Handling (TFA) systems can be beneficial for eliminating pollutants, allergens, and contaminants, and Dedicated Outdoor Air Systems (DOAS) reside well for exercising immaculate humidity control.

3. What are some effective ways to improve indoor air quality through ventilation? Are there specific types of filters or systems recommended?

 

  • Innovative technologies

Considering that ventilation for enhancing indoor AQI can be achieved with the help of HVAC systems, it is essential to innovate and upgrade the systems by harnessing the power of advanced technologies.

  • Integrating groundbreaking solutions such as energy recovery ventilators (ERVs) can maximize ventilation by promoting heat and humidity exchange between incoming and outgoing air.

 

  • Similarly, TFA (Treated Fresh Air Units) bodes well for conducting the pre-conditioning of outdoor air for introducing clean and healthy air into the room. Being well equipped with energy recovery wheels, it goes a long way in recovering both sensible and latent energy, contributing to the energy efficiency of the systems.

 

  • Installing Dedicated Outdoor Air Systems (DOAS) controls the humidity levels with the help of unique passive dehumidification wheels and also facilitates replenishment of fresh air and removal of indoor air pollutants.

 

  • Smart Systems

 

Making use of AI or ML-driven systems can upscale the ventilation as it comes in handy for exercising centralized monitoring, data storage, etc., Such innovations help in smart and precise monitoring of the HVAC equipment based on the occupancy patterns.

4. What are some common mistakes homeowners make regarding home ventilation, and how can they avoid them? What should homeowners keep in mind about ventilation when renovating or upgrading their homes?

When it comes to ventilation, the common mistakes that people make are:

  • Neglecting natural and exhaust ventilation

Considering that modern-day houses and commercial buildings as well boast glass facades and packed structures for aesthetic appeal, they lack openings for natural ventilation. There are also instances where exhaust fans in kitchens and bathrooms skip people’s minds. It is advisable to make the best of natural ventilation, as it can significantly reduce the load on HVAC systems. Likewise, exhaust fans are also important for curbing the buildup of excess moisture and pollutants.

 

  • Avoiding maintenance

Once the HVAC systems are installed, people generally don’t pay any attention to the maintenance of the systems. However, cleaning and repair of HVAC systems should be conducted at regular intervals of time to avoid any damage or unplanned downtime. Systems in poor condition can severely compromise the effective ventilation of the space and consequently might not be able to address perils arising from poor IAQ of the building. Therefore, ensuring maintenance can prolong the lifespan of the systems and keep their longevity intact for a longer period of time.

  • Clogging of vents and registers

Very often, people tend to cover the vents with curtains, furniture, or other items, blocking the smooth airflow. This can lead to inefficiency of the HVAC systems and account for uneven heating and cooling of the room.

  • Wrong size

Selecting the right size is very challenging for people, where they might end up installing either an oversized or too small system for the building. Where large systems are responsible for frequent system on and off, undersized systems struggle to achieve and maintain the desired temperature. In both cases, it is difficult to drive the efficiency of the operations, leading to poor ventilation of space.

5. How often should ventilation systems be inspected or maintained? Are there signs that indicate a problem with a home’s ventilation system?

The maintenance of ventilation systems should be done at regular intervals of time. People can recognize any problem with the systems when experiencing uneven heating and cooling. A significant rise in electricity bills can suggest inefficient working of mechanical systems or malfunctioning of the HRV/ ERV systems.

Similarly, poor airflow can indicate blockage in supply vents and can be identified in case there is difficulty in opening doors or windows resulting from pressure imbalances. Experiencing stale or stuffy air, even after ventilation or lingering odour, implies poor air circulation. At the same time, the occurrence of frequent condensation on windows, walls, or ceilings and the growth of mould or mildew signify the presence of excessive humidity within the space.

One can also identify damage to ventilation systems by noticing increased dust accumulation even after regular cleaning. At the same time, on experiencing escalation of respiratory health issues, it is advisable to check for poor filtration of the systems.

Employing predictive maintenance with the help of advanced technologies can give significant results. The smart sensors, routine system upgrades, and Building Management Systems (BMS) enable real-time monitoring and updates. Together they work towards timely identification of any issue in the systems, encouraging prompt action to address the problem.

 

Varun Pahwa, President, Desiccant Rotors International 

Pollution has been a pressing concern in the national capital, especially as the city reels under the influence of deteriorating outdoor & indoor air quality. With the Air Quality Index (AQI) plummeting to the ‘severe category’ exceeding the 400 mark, people have been facing a lot of health issues. Looking at the severity of the situation, where the entire focus has been on air pollution outside, people fail to understand its significant impact on Indoor Air Quality (IAQ), which can be more contaminated as compared to outdoor air.

The IAQ further deteriorates remarkably in commercial and industrial spaces such as offices, schools, airports, hotels, etc. Such spaces are majorly characterized by the large buildings with complex structures, making it difficult for the contaminated air to find an escape. Consequently, this significantly contributes to the buildup of pollutants, dust, and allergens within the enclosed space. Moreover, with the sharp rise in pollutants such as PM2.5, PM10, carbon dioxide levels, VOCs, etc., they are responsible for giving rise to a range of respiratory issues, cardiovascular conditions, and neurological disorders.

Exacerbating the conditions further, long-term exposure to poor IAQ can lead to a condition called Sick Building Syndrome (SBS). People suffering from the condition generally experience fatigue, headaches, lethargy, nausea, wheezing, throat irritation, etc. SBS has also been linked to reduced productivity of the occupants as the unhealthy indoor air comes with the ability to severely impact the physical and mental well-being of the person.

Forcing schools to remain closed on account of poor IAQ, and even offices making major adjustments with 50% working capacity, it has a far-reaching effect on the normal functioning of commercial and industrial spaces. Therefore, understanding the repercussions, it underscores the importance of monitoring IAQ of the enclosed commercial spaces amidst rising pollution outside.

Considering that improving the IAQ can be very challenging for large spaces, installing advanced Air Purification Systems (APS) should be prioritized in the buildings. The technology comes with the proficiency to maintain good IAQ within the facility and, in turn, promotes a healthy environment for people occupying the space. It provides an innovative solution for eliminating the outdoor air pollutants at the source. Being well-equipped with honeycomb designed chemical filters it ensures 100% removal of gaseous contaminants and checks the entry of harmful particulate and gaseous pollutants at multiple levels.

This is majorly because it operates as a “beginning-of-the-tube” system, conducting purification of the air at the source with the help of advanced filtration technologies. In contrast to the standard air purifiers, which work within indoor spaces, treating outdoor air that has already entered and mixed with the indoor environment, the APS systems purge the air at the point where it enters the indoor environment. This fundamental difference positions APS as a proactive solution, addressing air quality issues before they infiltrate indoor spaces.

In addition to this, the systems maintain positive pressure across the indoor space, preventing the infiltration of contaminated air into the building. It conducts thorough cleaning of outside air with the help of proper particulate and chemical filtration before introducing it into the room. Thereby, residing well for diluting the indoor pollutants with the help of clean air outside, the systems also ensure maintenance of carbon dioxide with measuring units.

Therefore, with people taking refuge indoors with rising pollution outside, it becomes essential to deploy Air Purification Systems, especially in large buildings. This can play a pivotal role in checking the influence of outside pollution on IAQ and ensuring people are protected from a range of health problems associated with it.

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