DOI: 10.5061/dryad.kh18932kr
title: Data from: Mechanical ventilation and indoor air quality in recently constructed homes in the humid climate of the southeast U.S.

description: This study is part of the Building American Ventilation and Indoor Air
 Quality (BAVIAQ) field study. This study examines whole-house mechanical
 ventilation (WHMV) and indoor air quality (IAQ) in 51 single-family homes
 constructed since 2013 in the humid southeastern U.S in Florida, South
 Carolina, and Georgia. A total of 67 weeks of data were collected from
 homes monitored over one or two weeks, with whole-house mechanical
 ventilation (WHMV) systems either operated or not. Eleven homes were
 monitored under both WHMV conditions. The dataset includes time-resolved
 measurements of CO₂, PM2.5, formaldehyde, and radon; and time-integrated
 measurements of gravimetric PM2.5, NO₂, NOₓ, and formaldehyde. Occupants’
 activities, including ventilation equipment usage, cooking, window
 opening, and other usage related to IAQ, were also monitored. Participants
 were asked to provide the household characteristics, their practices
 related to ventilation and pollutant sources and controls, and their
 satisfaction with air quality, thermal comfort, and other environmental
 factors in the home. Building envelope and duct leakage, and mechanical
 ventilation airflows were measured. WHMV system type, control, labeling,
 operational status, and ASHRAE 62.2–2010 compliance were documented. The
 dataset supports research on IAQ impacts of WHMV systems, building
 performance gaps, occupant behavior, and pollutant exposure in
 energy-efficient residential buildings. It enables paired comparisons
 under controlled conditions and provides a foundation for evaluating
 compliance with ventilation standards and their effects on indoor
 pollutant levels.
description: Overview of
 the data collection The basic structure of the study
 was to characterize the mechanical ventilation equipment functionality in
 each house through observations and performance measurements, monitor
 ventilation equipment usage, and measure air quality parameters indoors
 and outdoors over weeklong periods. Data were also collected by asking
 occupants to provide information about the household, their practices
 related to ventilation and pollutant sources and controls, and their
 satisfaction with air quality, thermal comfort, and other environmental
 factors in the home. Most homes were monitored for one week with WHMV
 equipment operating or not operating (with some adjustment or activation
 by the field team required in many of the homes). In a subset of homes,
 monitoring occurred for two weeklong periods: one with WHMV set to operate
 and one with WHMV not operating.  Each study home was
 visited by a two-person field team at the start and end of each monitoring
 period. Ventilation equipment characterization typically occurred during
 the first visit and included documenting the system configuration and
 as-found operational status. During this visit the field team installed
 instrumentation to measure indoor and outdoor air quality parameters,
 operation of ventilation equipment and the CFA system, use of the main
 cooking appliance and the open-closed position of selected doors and
 windows. Two-week homes were visited between the weeks to collect and
 redeploy passive samplers, download data from some instruments, and reset
 the WHMV equipment to the alternate condition. House characterization
 typically occurred during the final visit and included measuring air
 leakage of the building envelope air distribution ducts of the central
 forced air (CFA) heating and cooling system. Observational data collected
 during the field team visits included ventilation equipment model numbers,
 filter ratings, filter location, type of cooking appliance and other
 details. The team also asked the participant if they thought their home
 had a WHMV system and if so, did they know how to operate it. 
 Participants were asked to partake in normal household activities
 with the exception that windows and doors should not be used for natural
 ventilation, and no smoking of any kind should be done inside the home
 during the data collection period. Participants were asked to complete an
 activity log for each day of the monitoring period designed to record
 actual occupancy as well as routine and intermittent activities that could
 affect IAQ.   The study was reviewed and approved by
 the Central Institutional Review Board (IRB) of the U.S. Department of
 Energy. Measuring and monitoring airflows and air leakage Airflows were measured for WHMV systems, bathroom and kitchen exhaust fans, and clothes dryers. To determine inputs and coefficients for the natural infiltration model, a Delta-Q test was conducted in each home to measure building envelope and duct leakage, and to determine envelope leakage flow coefficient (c) and exponent (n).  Forced air heating and cooling system operation were monitored by deploying anemometers and TRH sensors at supply air registers. Cooking appliance usage was monitored by temperature sensors on the cooktop surface. Patio door, garage to house door, and main bedroom door status were recorded. Portable air cleaners and other devices related to IAQ were monitored by plug load power meters. Air quality measurements Air quality measurements were conducted at both onsite outdoor and indoor locations. The devices used in this study for indoor and outdoor air quality measurements and their accuracy, deploy locations are shown below Measurement Device Parameters Accuracy^(a)^ Res. Sampling locations Met One ES-642 Photometer Estimated PM<sub>2.5</sub> by photometry ±5% traceable standard with 0.6 µm PSL, autozeroing function enabled to check baseline hourly^(b)^ 1 min Outdoor Met One BT-645 Photometer Estimated PM~2.5 ~by photometry ±5% traceable standard with 0.6 µm PSL, autozeroing function enabled to check baseline hourly^(c)^ 1 min Indoor central AirVisual Pro Estimated PM<sub>2.5 <sub>by photometry</sub>, <sub>CO</sub>2</sub>, T, RH CO<sub>2</sub>: ±50ppm or 2% of reading^(d)^ 10 sec–5min Indoor central; Master BR; Office, secondary bedroom or family room Ogawa Passive Samplers NO<sub>2</sub> and NO<sub>x</sub> Based on field validation^(e)^: 7 d relative deviation of 3±2% NO<sub>2</sub> at 11-37 ppb; 4±3% NO<sub>X</sub> at 16-85 ppb; 10±9% (NO<sub>X</sub>-NO<sub>2</sub>) at 4-56 ppb 1 wk Outdoor; indoor central Graywolf FM-801 HCHO ±4 ppb &lt;40 ppb, ±10% of reading ≥40 ppb 30 min Indoor central; Master BR SKC UMEx-100 Passive HCHO ±25%, exceeds OSHA requirements 1 wk Outdoor; Indoor Onset HOBO UX100-011 T, RH ±0.21 °C from 0 to 50 °C 1 min Outdoor (U23); Indoor central (UX100-011); RadStar RS300 Radon, short term &lt;10% deviation from 0.5 to 150 pCi/L 60 min Indoor: central and/or basement AccuStar Alpha Track Radon, long term General within ±15% to ±30% when deployed in the field for periods ≥3 months 3–6 month Indoor: central and/or basement PEM Sampler PM~2.5 ~by gravimetric mass Balance accuracy: 0.1µg 1 wk Outdoor; Indoor a. Based on manufacturer specifications unless otherwise noted.<br> b. Outdoor PM concentrations measured by MetOne showed close agreement with nearby regulatory monitors. See Quality Assurance sections for details.<br> c. Cross checks between the indoor and outdoor MetOne units showed close agreement. Therefore, no adjustment was applied to the indoor MetOne data. See Quality Assurance sections for details.<br> d. Co-location between AVP units found good correlation in CO2 measurements, see Quality Assurance sections for details.<br> e. Based on field validation in California reported by Singer et al. 2004.<br> f. The collected mass on a filter was determined as the difference in post and pre-exposure weights and air concentrations were calculated using the sample volume calculated by the elapsed exposure time and sample airflow.See Quality Assurance sections for details Participant survey and daily activity log Prior to the field team visit to the homes, participants were provided with and asked to respond to an online questionnaire that asked how they feel about their home environment and about the factors that can affect their IAQ. They were also asked about activities and product use and for information related to the home and household, including basic demographic and health-related questions. During the first visit the field team provided participants with a printed activity log for each day of the monitoring period designed to capture actual occupancy and routine and intermittent activities that could affect IAQ. This included prolonged opening of windows and doors, house cleaning, cooking, and burning candles. The log also had the occupant report periods of poor outdoor air quality, for example from a nearby forest fire.
description: # Dryad dataset Dataset DOI:
 [10.5061/dryad.kh18932kr](10.5061/dryad.kh18932kr) ## Description of the
 data and file structure ### **What is in the dataset?** The dataset
 contains the most relevant information collected about the houses and
 their mechanical equipment, results of the participant survey, results of
 air leakage and airflow measurements at the homes, pollutant
 concentrations measured by time-integrated passive samplers inside and
 outside of the home, usage of cooktop and oven, external door and window
 open state, and time-series or air pollutants and environmental indicators
 measured within and outside of the houses. ## **Organization of Dataset**
 #### **Airflow** This folder contains time-resolved data of the calculated
 overall air exchange rate. The total air change rate for the home depends
 on a combination of the various mechanical ventilation systems, the
 natural infiltration due to stack and wind effects, and the envelope
 leakage. The natural infiltration rate was estimated using the single-zone
 models described in the ASHRAE Fundamentals Handbook, assuming no
 substantial window or door opening. The total air change rate was
 calculated for each minute by combining the airflows from mechanical
 ventilation fans, duct leakage, and natural infiltration using procedures
 from the ASHRAE Handbook of Fundamentals. There is one csv file for each
 measured week (Home_ID). There is also a specific README file in the
 folder (BAIAQ_FSEC_Airflow_ReadMe) for more details. Missing data
 resulting from either an invalid flow measurement or the unavailability of
 outdoor weather data were filled with “NA”. #### DeltaQ This folder
 contains data about the DeltaQ test results for each home. There is one
 csv file containing the results for all 51 homes. Three homes (433,434,
 439) did not perform a DeltaQ test, and the blank rows were filled with
 “Not measured”. Two homes (420, 436) did not get valid results for duct
 leakage; the cells were filled with “invalid”. The columns in the csv file
 are explained below. Average_Baseline_Pa: the average baseline pressure
 difference between the Ductblaster fan (Pa) Pressurization_C,
 Pressurization_n: the flow constant (c, n) estimated from the
 pressurization test Depressurization_C, Depressurization_n: the flow
 constant (c, n) estimated from the depressurization test
 Supply_DuctLeakage_CFM, Return_DuctLeakage_CFM: initial estimated supply
 and return duct leakage (CFM) reviewed Qsupply, reviewed Qreturn: supply
 and return duct leakage estimated after the researcher’s review, and
 suggested using (CFM) Supply_DuctPressure: supply duct pressure during the
 DeltaQ test (Pa) Return_DuctPressure: return duct pressure during the
 DeltaQ test (Pa) Pressurization_ACH50: Air tightness presented in air
 change per hour at 50 Pa difference when pressurizing the house envelope 
 Depressurization_ACH50: Air tightness presented in air change per hour at
 50 Pa difference when depressurizing the house envelope  ACH50: Averaged
 envelope air tightness presented in air change per hour at 50 Pa
 difference by considering both pressurization and depressurization
 Total_DuctLeakage: total duct leakage by summing up both supply and return
 duct leakage (CFM) Floor area: total floor area of the house (sq. ft.)
 Ceiling height: Average ceiling height of the house (ft) Review note:
 researcher review note for each DeltaQ test #### Home_characteristics This
 folder contains data about the house, including basic characteristics, air
 leakage test results, and measured airflow rates of mechanical ventilation
 equipment. There is one EXCEL file containing three spreadsheets: The home
 characters spreadsheet includes data for all homes. Each home's data
 were in a column, with each measured/estimated parameter as a row. For the
 parameter that is not applicable to the test house, the cell is filled
 with “NA”. For the parameter that was not checked or measured by the field
 team, the cell is filled with “Not checked” or “Not measured”, or “NM”. In
 some cases, the field team cannot determine the condition after the field
 check, and the cell is filled with “Unclear” or “cannot be determined”.
 Parameter description& ReadMe spreadsheet explains parameters in the
 homes characters spreadsheet one by one with the same order as the home
 characters spreadsheet (Column B). And the input abbreviations and general
 notes (Column C). If a cell in Column C was left blank, it means that
 there is nothing special to note for data input for the parameter in the
 row. Review notes include the notes from the researcher and field teams
 for certain homes that had input data issues or where the input data needs
 to be clarified. Column A displays the parameters in the same order as the
 home characters spreadsheet. For a parameter for which certain homes have
 issues, the notes are displayed in column B at the same row as the
 parameter. The cell in column B is left blank if there’s no issue with
 this parameter for all homes. #### IAQ_Activity_Monitoring This folder
 contains time-resolved indoor and outdoor air quality data, including
 PM2.5 as measured by MetOne photometry (PM), Radon (Rn), indoor PM (PM1,
 PM25, PM10) concentrations measured by an IQair Air Visual Pro (AVP)
 low-cost sensor, carbon dioxide (CO~2~), formaldehyde (FRM), temperature
 (T), and relative humidity (RH) in different rooms. Data also included T
 and RH measured at the supply air register, attic, and basement (AS, ATT,
 BS).  This folder also contains time series data of cooktop burners and
 oven monitored using iButton temperature sensors (IBU), other cooking
 devices monitored using AC power logger (PTR), whole house mechanical
 ventilation system, kitchen range hood and bathroom fan on/off monitored
 using either an anemometer (ANM) or a motor sensor (MTR), and open/close
 status of doors and windows monitored with state sensors (STA). There is
 one csv file of 1-minute time-series data for each home_ID, totaling 67
 csv files. A specific read me file (IAQ_Activity_Monitoring_ReadMe) was
 included in the folder for data header definitions and data issues. Most
 instruments had internal logging and special software to download data
 from the field instruments and convert the data files to csv format.
 One-minute resolution time-series data files were created for each house
 using a Python script that pulled data from multiple csv files, aligned
 data by time, executed unit conversions, and interpolated data that were
 measured at different time resolutions. Visual review was conducted on the
 compiled files to check for translation or writing errors, indications of
 instrument malfunction, mislabeled units or unit conversion errors,
 mislabeled location, and time stamp errors. Missing data resulting from
 either instrument failure or invalid readings identified by researchers
 were filled with “NA” in each csv file. #### IAQ_Sample This folder
 contains the results of time-integrated air quality samples, including
 passive measurements of formaldehyde, nitrogen dioxide, and nitrogen
 oxides, and PM2.5 gravimetric filter measurements. There are three CSV
 files containing each type of data. ##### Ogawa samplers  The passive
 Ogawa samplers were collected from test homes with gas cooking appliances.
 The CSV file contains the exposure information, laboratory extract results
 from Ogawa samplers, and the final calculated NO~2~, NO, and NO~x~
 concentrations in ppb and µg/m^3^. The spreadsheet contains the following
 columns. Sampled home ID and Exposure information: Week: Measured week for
 each home, 1– for one-week homes, week1 and week2 for two-week homes, and
 on/off indicate the WHMV system status during that week Deployment
 Location: The sampler's deployment location in each test home.
 IN1–central location (living room); IN1D–Duplicates in the central
 location; OUT–outdoors; BLANK–field blank  Start Time & Date and Stop
 Time & Date: the start and end times of the sampler deployment,
 recorded by the field team Elapsed Time (days) and Elapsed Time (min): the
 elapsed time calculated from start and end times in days and minutes
 Environmental Data during exposure: Avg. RH% and Avg. Temp C: average
 relative humidity and indoor temperature during the exposure time in % and
 Celsius. PT: Water vapor pressure at exposure, calculated based on average
 indoor temperature (mm Hg) P: Water vapor coefficient calculated based on
 PT AlphaNO~2~ and AlphaNO: NO~2~ and NO adjust constants calculated based
 on Temperature, RH, and PT. IC Data from lab extraction and analysis:
 NO~2~ pad-Nitrite Conc: Raw NO~2~ pad concentration from IC extraction
 (ug/mL) NO~x~ pad-Nitrite Conc: Raw NO~x~ pad concentration from IC
 extraction (ug/mL) NO~2~ pad-Nitrite Conc. Blank Corrected: NO~2~ pad
 concentration from IC extraction corrected by the field blank (ug/mL)
 NO~x~ pad-Nitrite Conc. Blank Corrected: NO~x~ pad concentration from IC
 extraction corrected by the field blank (ug/mL) Final calculated
 NO~2~/NO/NO~x~ concentration: NO~2~/NO/NO~x~ Blank Corrected:
 NO~2~/NO/NO~x~ mass loaded on the pad, calculated from previous two
 columns (ng) NO~2~/NO/NO~x~: measured air NO~2~/NO/NO~x~ concentration in
 ppb of each sample (ppb) Notes: Notes from the field team and researchers
 during the deployment and analysis. The cell is left blank if everything
 looks normal. ##### UMEx samplers  The UMEx passive samplers were
 collected from all test homes. The CSV file contains the exposure
 information and extract results for UMEx samplers. Samples were exposed
 for the full duration of sampling at test houses indoors and outdoors,
 with field blanks deployed in a few homes. The exposure duration and the
 extract analysis results were listed. The final formaldehyde
 concentrations were calculated, as shown in parts per billion. The
 spreadsheet contains the following columns. Sampled home ID and Exposure
 information: Week: Measured week for each home, 1– for one-week homes,
 week1 and week2 for two-week homes, and on/off indicate the WHMV system
 status during that week Deployment Location: The sampler's deployment
 location in each test home. IN1–central location (living room);
 IN1D–Duplicates in the central location; OUT–outdoors; BLANK–field blank 
 Start Time & Date and Stop Time & Date: the start and end times of
 the sampler deployment, recorded by the field team Elapsed Time (days) and
 Elapsed Time (min): the elapsed time calculated from start and end times
 in days and minutes Volume: total volume of air passing through the
 sampler during the exposure time (L) Lab analysis and results:
 Formaldehyde (ng): Total Formaldehyde mass loaded on the sampler during
 exposure time (ng) Blank (ng): Formaldehyde mass loaded on the field blank
 sample. If no field sample was deployed for this home, a study average
 value of 195 ng was used. Formaldehyde (ug/m3): Calculated Formaldehyde
 air concentration in each home in ug/m3 Formaldehyde (ppb): Calculated
 Formaldehyde air concentration in each home in ppb Notes: Notes from the
 field team and researchers during the deployment and analysis. The cell is
 left blank if everything looks normal. ##### PEM samples.  The PEM sampler
 collected gravimetric PM2.5 mass on a PTFE filter through a pump that
 continuously ran indoors (IN) and outdoors (OUT) at each test home. The
 gravimetric PM2.5 concentration was calculated using the total volume of
 the air passing through the filter during the elapsed time and the mass
 load, as shown in the unit of microgram per cubic meter. Invalid
 measurements due to instrumentation or analysis were filled with “NA”. The
 spreadsheet contains the following columns. Sampled home ID and Exposure
 information: Week: Measured week for each home, 1– for one-week homes,
 week1 and week2 for two-week homes, and on/off indicate the WHMV system
 status during that week Deployment Location: The sampler's deployment
 location in each test home. IN1–central location (living room);
 IN1D–Duplicates in the central location; OUT–outdoors; BLANK–field blank 
 Start Time & Date and Stop Time & Date: the start and end times of
 the sampler deployment, recorded by the field team Elapsed Time (days) and
 Elapsed Time (min): the elapsed time calculated from start and end times
 in days and minutes Avg, Flow (LPM): The average flow rate of the pump
 extracting air for the PEM sampler (LPM) Volume: total volume of air
 passing through the sampler during the exposure time (L) Lab analysis and
 results: Mass Loading (ug): The mass load of PM2.5 on the filter, which
 was calculated based on the pre- and post-weight of the PTFE filters. 
 Conc (ug/m3) No Blank used: The calculated PM2.5 concentration for each
 sample, with no field blank subtracted from the value (ug/m^3^). Notes:
 Notes from the field team and researchers during the deployment and
 analysis. The cell is left blank if everything looks normal. ####
 Long-term_Radon This folder contains one CSV file containing long-term
 Radon concentrations in pCi/L for each home with measurements. A passive
 sampler was deployed in the lowest living level of each test home for at
 least six months. The passive samplers were retrieved and mailed back to
 the lab for analysis. The sampler location, exposure start and stop date,
 and the final average concentration over the exposed period were shown in
 the csv file. #### Occupant_Activity This folder contains tabulated
 information provided by study participants from their daily activity logs.
 The PDF file is an example of the format of the activity log used in the
 field study. A researcher manually transcribed the handwritten logs into a
 CSV file for each measured week in each home. There are a total of 68 CSV
 files named by home_IDs in the folder.  The activity logs were in hourly
 blocks; the blocks were filled with “X” or the number of hours that an
 activity happened in this hour. If nothing happened in this hour, the
 block was left blank, without any “NA” filled. If other activities that
 were not listed in the logs happened, occupants were asked to fill in
 “other_event” rows and indicate in the “note”. Commonly used event
 abbreviations are shown below: Air Freshener; Dehumidifier; Fireplace;
 Humidifier; Incense; Portable Air Cleaner; Smoking; Vaping; Other ####
 Occupant_Survey This folder contains survey results about the occupants,
 their general activities related to ventilation, and IAQ satisfaction,
 completed by study participants. There is one csv file containing data
 transcribed by a researcher. In the csv file, each row represents the
 response from a home. Each column represents a survey question. The PDF
 file contains questions from the occupant surveys.  Two homes did not fill
 the survey (410 443), and were not included in the csv file. In some
 homes, the occupants did not complete the survey; the survey questions
 that were left blank were filled with “-99”. For the survey questions that
 are not available for the test house and household, the results are filled
 with “NA” #### WHMV_Config The information in this section is the details
 about the Whole House Mechanical Ventilation system (WHMV) in each test
 house. The information was extracted from the Home_Characteristics
 spreadsheet and carefully reviewed by the researchers and field teams,
 with additional information added. If there is any conflicting information
 between the Home_Characteristics table and spreadsheets in this section,
 please ALWAYS use the information here. This folder contains three 3
 spreadsheets in one EXCEL file: ##### WHMV configuration  The spreadsheet
 summarizes the WHMV system characteristics for each home, including system
 type, airflow, and runtime as found and during the test week, WHMV labels
 condition, household survey answers for WHMV recognition, and HVAC filter
 information. The spreadsheet also keeps the equations that researchers
 used to calculate the WHMV airflow to meet the requirements of ASHRAE 62.2
 standards. The spreadsheet has the following columns and information: 1.
 Column A-C: Test home ID, location, and visit date. 2. Column D-J: the
 initial and final configured WHMV system type and its exhaust/supply
 locations indoors and outdoors. The WHMV type was initially configured by
 the field team, and then the configuration was finally reviewed by
 researchers. If the house had a 2nd WHMV system or an occupant used a fan
 as a WHMV, the information was also listed. 3. Column K-N: The as-is WHMV
 operating condition when the field team first arrived at the house, which
 includes the airflow measured as found (CFM), and runtime (min per hour)
 as found. 4. Column O-R: The WHMV operating condition during the test
 week. The field team adjusted and/or repaired some of the WHMV systems to
 make them suitable for operating during the test week. The adjusted
 airflow (CFM) and runtime (min per hour) during the test week were shown.
 The capable flow shows the maximum airflow (CFM) the WHMV could achieve
 after repair and adjustment. 5. Column S-V: The ASHRAE 62.2-2010 required
 WHMV airflow for each house and the ratio of as-found, test, and capable
 airflow to the requirement 6. Column W-Y:  WHMV system controller details,
 label condition, and sound rating 7. Column AB-AC: Household survey
 answers for WHMV recognition 8. Column AD-AE: Total Bathroom fan counts
 and the counts of bathroom fans with sound rating &lt;1 sone in each house
 9. Column AF-AJ: filter information, including HVAC filter location and
 rating, and ERV/HRV filter condition 10. Column AK: note from field team
 and researchers, including detailed narratives about some WHMV systems in
 special cases. ##### BA_fan_details  The spreadsheet contains the on-site
 measured airflow of each bathroom fan installed in each home and the sound
 level rated by the Home Ventilation Institute or reported by the
 manufacturer. If the fan and the information were not checked by the field
 team and researcher, the cell is filled with “Not measured”. If the
 information is not applicable to certain fans, the cell is filled with
 “NA”. Bathroom fan location code:  BA1–– master bathroom BA2, BA3––
 2nd/3rd bathroom TO1–– Toilet room either inside the master bathroom or a
 separate toilet room without a shower SW1–– Shower room Parameter:  Flow:
 Field-measured airflow of the bathroom fan (CFM) Sone: Sound level rated
 by Home Ventilation Institute or reported by the manufacturer (SONE)
 Control: Bathroom fan control type capable: The ratio of measured airflow
 of the bathroom fan to the ASHRAE 62.2-2010 required WHMV airflow (%)
 ##### Rangehood_details  The spreadsheet contains the on-site measured
 airflow of the range hood in each home. The installation conditions,
 including vent duct direction, outside vent location, and mount type, are
 also included in the spreadsheet. The spreadsheet also includes
 information about cooktop and oven types.  KIT_EXF: Does the kitchen have
 other exhaust fans besides the range hood KIT_RHD_Type: range hood type,
 OTR–Over the Range microwave hood combo; RH– Range Hood; Downdraft –
 Downdraft hood KIT_Vent_Exit: where does the hood exhaust to the ambient
 air KIT_RHD_Brand, Model: range hood brand and model; some of them were
 not checked KIT_RHD_MountType: How does the range hood mount
 CKT_Fuel_Type: cooktop fuel type OVN#_Fuel_Type: oven fuel type
 RHD_FanSpeed#_Measured_cfm: field measured range hood airflow at each
 speed setting (CFM). “NA” = no such speed setting “NM” =not measured
 Lowest speed flow: Measured airflow at lowest speed setting (CFM) Range
 hood note: researcher and field team review notes. The cell is left blank
 if no issue is figured. ## Human subjects data This study was reviewed and
 approved by the Central Institutional Review Board (IRB) of the U.S.
 Department of Energy. All participants provided written informed consent,
 which included permission to publish their de-identified data in the
 public domain for research and educational use. To protect participant
 privacy, all personally identifiable information (PII)—including names,
 addresses, precise geolocation, and contact information—has been removed
 or anonymized. Each home was assigned a randomly generated study ID that
 does not correspond to any internal or field-collected identifier. Time
 stamps were generalized as needed to prevent potential re-identification,
 and no free-text responses or media content are included. The dataset has
 been reviewed to ensure that the risk of re-identification is minimal, in
 compliance with established data protection standards.