Air concept:A04 CONSTRUCTION POLLUTION MANAGEMENT and 05 ENHANCED AIR QUAILTY and A06 ENHANCED VENTILATION DESIGN

A04 CONSTRUCTION POLLUTION MANAGEMENT(PRECONDITION)

• Protect indoor air quaility during building construction and renovation through a combination of strategies: envelope protection, moisture and dust management, filter replacement, air flush and proper equipment selection

Part 1: Mitigate construction pollution

1. Ducts are maintained per: ducts are sealed and protected from contamination. And ducts are cleaned prior to installing registers,grills, and diffuser

2. If permanently installed ventilation system is operating during construction, filter must meet: 

Media filters with a PM₁₀ removal rating of at least 70% (e.g., MERV 8) are used to filter return air.⁶

All filters are replaced prior to occupancy.⁵

3. Moisture and dust managment prodedures: 1. Carpet, acoustical ceiling panels, fabric wall covering, installation, upholstery and furnishing are stored separately in protected from moisture damaged. 2. Work areas isolated by sealed doorways or windows. 3. Walk-off mats are used at entryways. 4. Saws and tools use dust guards to capture dust.

05 ENHANCED AIR QUAILTY( OPTIMIZATION)(4 pts)

Improve human health and performance

Part 1: meet enhanced threshold from particulate matter: (2 point)

1 Point: PM_2.5: 12 µg/m³ or lower.⁸

PM_10: 30 µg/m³ or lower.⁹

2 Point ^PM_2.5: ^{10 µg/m³ or lower.9}

^PM_10: ^{20 µg/m³ or lower.9}

Part 2: meet enhanced thresholds for organic gases (1 point)

• Acetaldehyde: 140 µg/m³ or lower.¹⁰

• Acrylonitrile: 5 µg/m³ or lower.¹⁰

• Benzene: 3 µg/m³ or lower.¹⁰

• Caprolactam: 2.2 µg/m³ or lower.¹⁰

• Formaldehyde: 9 µg/m³ or lower.¹⁰

• Naphthalene: 9 µg/m³ or lower.¹⁰

• Toluene: 300 µg/m³ or lower.¹⁰

Part 3: Meet inorganic gases:

• Carbon monoxide: 7 mg/m³ [6 ppm] or lower.¹¹

• Nitrogen dioxide: 40 µg/m³ [21 ppb] or lower.¹¹

A06 ENHANCED VENTILATION DESIGN (OPTIMIZATION)(3PTS)

Increased supply of outdoor air or increased ventilation efficiency

Part 1: Increase Outdoor air supple (2 points) options

Option1: increased air supple

Option 2: Demand control ventilation

Optoon3: enhanced natural ventailation

Option 1: Increased air supply

1. Exceed outdoor air supply rate in ASHRAE 62.1-2010:

• Threshold 30%-1 points

• Threshold 60%- 2 points

Option 2: demand control ventilation:

Met in at least 90% of regulary occupied spaces:

1. A deman control ventilation(DCV) system regulates the outdoor air ventilation to keep CO2 level less than threshold:

Threshold 900ppm-or threshold 500 ppm above outdoor level-point 1

Threshold 750 ppm-or 350 ppm above outdoor levels- point 2

1. Carbon dioxide is measured at the return air diffusers or in breathing zone at least 3.3 ft away from doors,windows, air supply. One sensor in each occupancy zone

Option 3: Enhanced natural ventilation

1. Implement an engineered natural ventilation system that sufficient to keep CO2 level in breathing zone

• Same thresholds as part 2

Part 2: Improve ventilation effectivness ( 1 point) for echanced ventilation design options:

Option1: Displacement ventilation system

Option 2: personalized ventilation system

Option1: Displacement ventilation system

• ASHRAE Guidelines RP-949.⁹

• ASHRAE 62.1-2019, "Stratified Air Distribution Systems (Section 6.2.1.2.1).¹⁰

• REHVA Guidebook No. 01 (Displacement Ventilation in non-industrial premises).¹¹

Option 2: personalized ventilation system

• For at least 50% of workstation is requriement:

Outdoor air is supplied in the breathing zone, with an airspeed of no greater than 50 fpm at the occupant's head.¹⁰

The return air diffusers are located more than 9.8 ft above the floor.¹⁰