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46 Cards in this Set
- Front
- Back
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What is the purpose of a sound masking system
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Sound masking systems supply a low level of background noise to provide workers with a degree of confidentiality in their communications and can decrease distraction associated with aural interruptions
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how is thermal comfort within the body provided?
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through homeothermy
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What is NRC?
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Noise reduction coefficient is an average value that determines the absorptive properties of materials.
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According to ASHRAE Standard 55 what are the two ways in which thermal comfort can be achieved?
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Standard Comfort Zone or Adaptive Comfort Zone
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What is a requirement of visual ergonomics within an office?
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All computer screens must be adjustable in terms of height and distance from the user
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in what systems of the human body are most of the adverse health effects found from ergonomics?
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musculoskeletal and nervous systems
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All spaces in mechanically ventilated projects must meet what criteria?
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ASHRAE Standard 55-2013 Section 5.3, Standard Comfort Zone Compliance
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Studies show that individuals that are exposed to traffic noise or any loud, repetitive exterior noise, can have a higher risk for which health concerns?
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higher risk for diabetes, stroke and heart attack. hypertension. |
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What is Reverberation time?
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RT60 is a metric which describes the length of time taken for a sound to decay by 60 dB from its original level.
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What are the 6 primary personal and environmental variables that contribute to an occupant's thermal comfort?
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air speed, dry bulb temperature, radiant temperature, humidity, metabolic rate, and clothing or other insulation.
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What items affect an individual's thermal comfort?
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Metabolism, body type, and clothing
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In regards to sound pressure level, each regularly occupied space must meet what sound pressure level when the space and adjacent spaces are unoccupied, but within t 1 hour of normal business hours?
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The occupied space must not exceed 50 dBA from outside noise intrusion.
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What topics does an occupancy survey cover?
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Acoustical, thermal comfort, furnishings, workspace light levels and quality, odors, stuffiness and other air quality concerns. Also cleanliness, maintenance and layout.
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What are the benefits of the new technology surrounding radiant temperature systems?
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more energy efficient, saved floor space, lower dust transportation and increased thermal comfort.
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Regarding acoustics, what is the difference between NRC and STC?
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NRC is the average value that determines the absorptive properties of materials. STC is value of the materials ability to attenuate airborne sound.
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What is the unit of measure for sound found within the Comfort section?
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Decibel (dB)
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72 ADA Accessible Design Standards
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Compliance with ADA standards and design (Precondition) |
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73 Ergonomics: Visual and Physical
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Provideall computer screens with adjustable height and distance. Provide at least 30%of workstations to be adjustable height- standing desks. Provide adjustable chair and depth adjustablecompliant with HFES 100. (Precondition) |
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74 Exterior Noise Intrusion
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Providethe outside noise intrusion does not exceed 50 dBa. (Precondition) |
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75 Internally Generated Noise
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Provideand acoustical plan outlining quiet and noisy areas. Confirm mechanicalequipment meets the following NC requirements: Open Office: NC 40, EnclosedOffice: NC 35, Conference Rooms: NC 30, Teleconference Rooms: NC 20. (Precondition) |
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76 Thermal Comfort
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Allmechanically and naturally ventilated to meat ASHRAE 55-2013. (Precondition) |
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77 Olfactory Comfort
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Providesource separation at restrooms, janitorial closets, kitchens, cafeterias andpantries through negative pressurization, interstitial rooms, vestibules,hallways or self-closing doors. (Optimization) |
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78 Reverberation Time
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Providereverberation times for the Conference rooms: 0.6 seconds and open workspaces0.5 seconds (Optimization) |
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79 Sound masking
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Providesound masking systems to achieve 45-48 dBa in open workspaces and 40-42 dBa inenclosed offices. (Optimization) |
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80 Sound Reducing Surfaces
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Provideabsorptive surfaces for ceilings in open workspaces (NRC 0.9) andConference/Teleconference rooms (NRC 0.8) for at least 50% of the surface ofthe ceiling. Partitions to meet NRC of0.8 for 25% of the surface of the surrounding walls in enclosed offices,conference/teleconference rooms and open workspace. Partial height partitions to have a minimumof NRC of 0.8. (Optimization) |
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81 Sound Barriers
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ProvideNIC of 35-40 in enclosed offices and NIC of 53 in conference rooms based on thepartition construction. Doors at privateoffices and conferencing to have gaskets, sweeps and non-hollow core. Partition construction to provide propersealing at top and bottom tracks, staggering of gyp board seams andpacking/sealing all penetrations through the partition. (Optimization) |
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82 Individual Thermal Control
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Providefree address with a thermal gradient of 3 degrees F across open workspaces andbetween rooms and floors. All openoffice spaces to allow for at least 50% free address. Allow access to personal fans. (Optimization |
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83 Radiant Thermal Comfort
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Providehydronic radiant heating and/or cooling systems and electric radiant systemsfor all lobbies, common spaces and 50% of the floor area in all offices andother regularly occupied spaces. ( |
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Within what sound range level do open office spaces fall?
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45-48 dBA
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In 2006, how many of the office buildings surveyed in the U.S. provided thermal environments that met generally accepted goals of occupant satisfaction?
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11%
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In spaces with high reverberation times, why are there higher levels of ambient noise?
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The sounds of voices and footsteps take longer to dissipate
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What best describes sound pressure level (SPL)?
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Pressure variation associated with sound waves and is measured in decibels.
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The human body's Cardiovascular, endocrine, and nervous system are affected by which of the following?
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Internally generated noise
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Studies show that individuals exposed to road traffic and aircraft noises have a higher risk for what health problem?
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Hypertension
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For the mechanical equipment sound levels to meet the WELL Building Standard what is the maximum noise criteria (NC) of enclosed offices?
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35
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What percentage of workstations must have the ability to alternate between sitting and standing positions to meet the requirement for the ergonomic section of the WELL Building Standard?
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30%
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According to WELL Building Standard having good acoustic comfort promotes which four items?
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Enhance social interaction, learning, satisfaction, and productivity
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Our office purchased new adjustable height chairs and desks that can go from sitting to standing. What else must our office purchase to complete Precondition 73 Ergonomics, Visual and Physical?
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Computer screen that adjust in height and distance.
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How many Americans are affected yearly by backpain?
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31 million
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Per WELL Building Standard, what minimum percentage of floor area in all offices and other regularly occupied spaces must meet the requirements set for in the ASHRAE Standard 55-2013 for thermal comfort through the use of hydronic radiant heating and/or cooling systems or along with electric radiant systems?
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50%
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For mechanically ventilated spaces which design criteria must the project team verify are met in order to meet Feature 76 Ventilated Thermal Environment?
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ASHRAE Standard 55-2013 Section 5.3
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By using sound masking and sound barriers which two human body systems can be improved?
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Immune and nervous systems
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Conference rooms and teleconference rooms have to have a minimum Noise Isolation Class (NIC) of what on the walls adjoining private offices, conference rooms or other teleconference rooms?
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Minimum NIC of 53
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Thermal comfort can most affect these three items: performance, productivity, and what?
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Mood
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What is the maximum noise criteria (NC) of open office spaces and lobbies?
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40
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What is the maximum reverberation time (RT60) for a conference room?
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0.6 seconds
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