Rest assured that the safety and wellbeing of our students and staff is the top priority for the Office of Facilities (OFM). We are continuing to work diligently to make sure that our facilities are healthy places to learn and work.
If, after reading the answers to the frequently asked questions below, school administrators still believe that additional air purifiers should be installed in their school to supplement their HVAC systems, they may use this Google Form to make a request. To ask a question that isn't addressed here or to get assistance with completing the request form, please call 240-740-2338.
Please note that this Web page contains links to pages that are outside MCPS. MCPS does not control the content or relevancy of those pages.
To help reduce the spread of germs, our building service staff regularly clean and disinfect all high-touch areas in Montgomery County Public Schools (MCPS) facilities using EPA-approved List N chemicals. Special attention is given to door handles, light switches, sink handles, and other surfaces that are touched frequently. Restrooms in common areas are cleaned and disinfected more frequently throughout the day.
No. For the safety and wellbeing of students and staff, building service staff do not enter instructional spaces during the school day unless an incident has occurred that requires their special attention. Building services will not clean/disinfect classrooms between class periods or during student lunch breaks.
No. Building service staff will not provide this level of detailed cleaning and disinfection. Teaching staff will need to care for the tools used for instruction in their own classrooms as well as their own personal workspaces.
As the last step in the daily disinfection process, building service staff will use chemical cleaners that you wouldn't necessarily want to have sprayed near certain items. For example, any items that you would keep in your kitchen cabinets at home (coffe cups, eating utensils, water bottles, etc.) should be put away. Medical supplies kept in health rooms (cotton balls, Q-tips, tongue depressors, etc.) should be safely stored as a general practice.
No. MCPS remains committed to maintaining a safe and healthy environment for all. This has been, and continues to be, accomplished through the use of cleaning products that reduce the adverse impacts on public health and the environment. All cleaning supplies have been evaluated and certified by third-party organizations such as Green Seal. Internally-developed criteria and standards include the following:
The chemical product review process includes an evaluation of product literature that provides safety and health information, recommended PPE for users (those who are typically most highly exposed to the products), and precautions related to using the chemical in school and office environments, and recommended product use and storage procedures. Additional information about product selection can be found in our Green Cleaning Brochure.
The electrostatic sprayers used by building service staff apply a positive charge to liquid disinfectants as the liquid passes through the nozzle. The positively-charged disinfectant is attracted to negatively-charged surfaces which allows the chemicals to efficiently coat hard, non-porous surfaces. In a nutshellm these units spray a siper fine mist that coats all hard surfaces. Building services will use the electrostatic sprayers to disinfect hard surfaces like desks, chairs, doors, etc. Building services will continue their practice of only cleaning and disinfecting rooms that are not occupied. This means that the electrostatic sprayers cannot be used while students or staff are in the room. For safety reasons, anyone who has a pacemaker or defribrillator must not use the electrostatic sprayer or stand close to anyone using it. Only trained building service personnel are allowed to operate the electrostatic sprayers.
The nozzles of our electrostatic sprayers are set to 110 microns. This setting produces a very fine mist that dries quickly. To put that size droplet into perspective, a strand of human hair is approximately 100 microns thick. When using the electrostatic sprayer, building service staff will point it toward hard surfaces such as doors, chairs, desks, and restroom stalls, walls, and sinks. They will not spray chemicals directly onto any paper, cloth, or other soft, porous surface. However, if you would prefer that the hard surfaces in your space not be disinfected, please post a sign on the door.
As part of our return-to-school action plan, OFM has taken the following steps to improve ventilation and ensure the health and safety of students and staff:
As MCPS prepares for the eventual return of students and staff to in-person learning, we are relying on the expert recommendations of government and public health organizations to help guide our actions. The American Society of Heating, Refrigeration and Air-Conditioning Engineers (ASHRAE), the Centers for Disease Control and Prevention (CDC), and the U.S. Environmental Protection Agency (EPA) continue to be our primary resources for information and guidance during the COVID-19 pandemic.
In 2020, ASHRAE published a position document that discussed various approaches for mitigating airborne transmission of infectious aerosols. MCPS is following ASHRAE's suggestion that the following modifications be considered for HVAC systems in non-healthcare facilities:
As suggested by experts in the field, increased outdoor ventilation and increased filter efficiency are the primary goals that guide our process for maintaining optimum air quality. Our facilities represent four primary scenarios with regard to our HVAC systems, and schools have been categorized as follows:
⧫⧫⧫⧫ = Schools with enhanced ventilation systems that require minimal modifications (filter upgrades and control adjustments are all that is needed)
⧫⧫⧫ = Schools with recently replaced systems that have enhanced ventilation (limited spaces require air cleaners)
⧫⧫ = Schools with older systems that can be modified (air cleaners are required to meet new COVID-19 IAQ requirements)
⧫ = Schools with systems that require more extensive mechanical attention as well as air cleaners
While students have been learning remotely, our maintenance and operations teams have visited every school to assess HVAC systems and the air filters in use. Staff are involved in a continuous process of cleaning in and around HVAC units, washing reusable filters, and replacing filters with the highest MERV-rated filters the system can accommodate. Units are checked each day to ensure that they are operating properly; repairs are made as needed. Air purifiers are being installed in the facilities that require supplemental support.
The Minimum Efficiency Reporting Value (MERV) is a rating scale developed by ASHRAE. MERV ratings indicate the percentage and sizes of particles that air filters can remove from the air as it passes through the filter. Filters with higher MERV ratings are able to remove higher percentages of particles, and more effectively remove small particles than those with lower MERV ratings.
We have performed the work necessary to meet ASHRAE guidelines as they relate to the indoor environments within our schools. Our facility information is technical in nature and long considered to be confidential as it provides details of our school buildings. In the era of heightened school security, these building plans and engineering details are not published on pubic domain. Therefore, we will not provide technical details relating to maintenance logs, equipment data sheets, building plans, commissioning reports, or other related technical information.
It is important to note that indoor air quality (IAQ) testing and reporting relates to topics such as mold, radon, indoor pollutants, and overall temperature and humidity controls. The focus of our IAQ program is on continual testing and reporting for items such as radon, lead, and asbestos, but also focusing on investigations of concerns related to mold, moisture, and odors. There is a significant distinction between IAQ testing and reporting and that of the COVID-19 ventilation and filtration mitigation strategies. If you are requesting an air quality report in the context of COVID-19 mitigation, this report will not provide the information you are requesting and/or seeking. Click here for our COVID-19 ventilation and filtration mitigation information.
Bringing in additional fresh outdoor air dilutes and flushes airborne particles - including viruses - out of the building. MCPS will be increasing the amount of time that HVAC systems operate to help "flush" the building prior to and after occupancy. For example, systems at an elementary school that would normally be scheduled to be "ON" from 7:00 a.m. to 5:00 p.m. will now be ventilated from 5:00 a.m. (two hours earlier) until 7:00 p.m. (two hours later).
Industry experts state that increasing air change rates can decrease the in-room concentration of air particles. The optimum target for our school buildings has been identified as four to six air changes per hour (ACH). It is important to note that ACH is defined as how many times the air in a room is replaced by air passing through a filtering device or by the introduction of outside air.
It is the intent for all classrooms to have a sufficient air exchange without opening classroom windows. However, it has been calculated that opening windows can have a significant impact on overall air exchange rates. During times of appropriate outdoor temperatures and humidity, it may be recommended to open windows to supplement current strategies.
No. The ability to open a window does not necessarily benefit you or your students. While an open window does increase ventilation, it can also cause problems by allowing dust, pollen, and other irritants to enter the room. Your school's HVAC system filters outside air and provides enough fresh air for your room. Even in the cases where supplemental air purifiers have been installed, opening windows is not necessary. Keep in mind that windows that don't have screens should not be opened. Another thing to consider is the fact that steps have been taken to facilitate appropriate airflow and ventilation in your classroom. We have met, and in most cases, exceeded the industry standards for proper ventilation and airflow.
No, you should not. According to ASHRAE standards, when operating properly, HVAC systems are designed to move, mix, and exhaust air in a way that dilutes and filters indoor air contaminates, including viruses. Shutting off HVAC systems disrupts this intentional dilution and filtering process and may actually increase the building occupants' risk of exposure to infectious contaminants like the coronavirus.
The air filtration in an HVAC system can be part of an overall risk mitigation approach, along with increasing ventilation, but it is not generally regarded as a solution by itself.
The decision was based primarily on whether instructional rooms utilized by students and staff have sufficient mechanical ventilation. The rooms served by dedicated outdoor air systems (DOAS) and energy recovery units (ERUs) do not need air purifiers whereas rooms served only by unit ventilators or fan coil units may need supplemental ventilation that air purifiers can provide.
At this time, air purifiers have been designated for use only in instructional classrooms, main offices, health rooms, and isolation areas.
Yes and no - it depends on how the portable is being used and its mechanical systems. Portables have been assessed and air purifiers have been placed where needed. Principals should alert OFM if they feel that a portable requires another assessment.
It is not recommended that staff members bring appliances, including air purifiers, from home.
No. Restrooms, by code, have exhaust fans and some form of makeup air from adjacent spaces, so they do not require air purifiers.
An open window means that the air purifier has to work longer to clean the air. When you limit the amount of air that the unit has to clean, you decrease the amount of time it takes to clean the air in the room. Opening a window during favorable weather conditions will increase ventilation in the space, but it is not necessary and may present other issues (dust, pollen, etc.).
Depending on the room's configuration, the air purifier should be placed in the back or the side of a classroom. This will allow the unit to work efficiently while minimizing noise levels and disruption during instruction. Air purifiers should always be placed so that its air intake and discharge vents are not obstructed. To allow for proper air circulation around the machine, keep materials and furnishings at least two feet away from the unit. Never place the unit near furniture or behind curtains! Also be aware that moving the unit could pose a potential tripping hazard on the electrical cord.
No. All air purifiers have been strategically placed in your school and should remain in the same room where they were originally placed.
While adjusting the unit to the high setting will indeed clean the air at a faster rate, the medium setting is sufficient. Remember that your school's HVAC system will already be cleaning the air. The in-room units are there to supplement the HVAC system.
It is not necessary to operate air purifiers overnight. To supplement your school's HVAC system, air purifiers should be operated during the day when your school is occupied. Your school's building services staff will turn the units on two hours before occupancy, and turn them off two hours after occupancy.
Air filtering exchange rates are typically measured in cubic feet per minute (CFM). Both units have multiple CFM ranges based on where they are set. Classrooms are being set between 300-400 CFM. The large Price units have a higher capacity that allows them to be used in larger spaces.
No. Based on guidance from the EPA, MCPS will not be using ozone-generating air cleaners. Ozone is a substance that irritates the lungs and that type of unit can result in ozone levels that are above safe exposure limits.
The Austin Air Healthmate Plus units should be set on medium. Settings on the larger Price Room Air Purifier units are set by the service technicians. It is not recommended that staff change the settings on the air purifiers, particularly the Price units.
Some air purifier models (BlueDri, Husqvarna, and XPower) have "change filter" lights that indicate when filters need to be changed. As a general rule, filter life is variable based on the air purifier model, airflow settings (low, medium, or high), the duration of operation (8 hours vs. 24/7), occupancy, and indoor air quality. The Austin Air units are unique in that the manufacturer recommends replacing the 4-stage HEPA/carbon combination filter once every five years under "typical" use. According to the manufacturer of the Price RAP units, the recommended life for pre-filters is 4,000 hours. Regardless of the model, your building service manager will visually check the air filters every other month and replace the filters when necessary.
Here are links to the user manuals for the air purifier units that MCPS has provided. If you cannot find adequate troubleshooting answers here, please ask your building service manager to submit a work order.
No. Our building service staff has been flushing the water in the schools regularly, even while students and teaching staff were not present. As a proactive measure , we implemented a school reopening flushing strategy before schools returned to in-person instruction. This flushing protocol is in accordance with recommendations from the Maryland Department of the Environment.
Effective June 27, 2021, hallway water fountains were returned to service on a school-by-school basis. As with all other frequent touch points, water fountains will continue to be cleaned regularly. Facilities that did not have water bottle filling stations were provided with a centrally-located portable 5-gallon water dispenser. As water bottle filling stations are installed in more schools, these supplementary water dispensers will be removed from service.
As an added safety measure, hallway water fountains were not available for drinking while schools were closed for in-person learning. Facilities that did not have water bottle filling stations were provided with a centrally-located bottled water dispenser.
Faucets for hand washing continue to remain turned on for use by students and staff. Classroom bubblers, which had been previously turned off as an added safety measure, were returned to service on June 27, 2021. They continue to remain in service and are included in the frequent flushing plans implemented in each school.
No, MCPS does not currently have any HVAC systems that use ultraviolet germicidal irradiation or bipolar ionization.
There are four very important reasons why we will not install plexiglass in our facilities:
School administrators are responsible for maintaining PPE supplies that will be used for students and staff. This includes face masks, hand sanitizer, and basic cleaning supplies that may be used only by teaching staff. Building service managers are, as they have always been, responsible for maintaining the PPE and cleaning supplies that are designated for use by their staff.
No. The security challenges that arise when classroom doors are open are greater than the benefit of having that additional hallway air enter a room. Leaving your door open is not an added benefit.
Please note that this Web page may contain links to one or more pages that are outside MCPS. MCPS does not control the content or relevancy of these pages.