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Zone Secondary Recirculation Fraction

NC-v4 EQp1: Minimum indoor air quality performance
posted by Dave Hubka on Jun 19, 2023, 9:53 am

ASHRAE 62.1, Section A1.2.2 states:

Er is less than 1.0 for plenum return systems with secondary recirculation (e.g. fan-powered...

Last reply: Julio Fernandez Amodia, May 8, 2025, 1:58 pm

Outdoor Air when Baseline has System 2

NC-v4 EAp2: Minimum Energy Performance
posted by Greenlab on Jun 2, 2021, 1:01 pm

I am following v4 and ASHRAE 90.1 - 2016.

I have an Hotel in...

Last reply: Marcus Sheffer, May 8, 2025, 11:44 am

Air Testing (Ozone test method)

NC-v4.1 EQc4: Indoor air quality assessment
posted by John Smith on May 19, 2020, 2:21 pm

Greetings all.

According to the guide, the allowed test methods for ozone are:

- Monitoring device with accuracy greater than 5 ppb or reading and resolution (5 min average...

Last reply: Robert Cashins, May 8, 2025, 11:09 am

Are there any Sunset Dates for v4.0 (since v4.1 is now active)? 2Qs

LEED v4.1 Discussion Forum
posted by Jenni Betancourt on Mar 23, 2020, 3:06 pm

I have a very large project that will not start construction until 2022 or 2023 and it will be under construction for several years. I therefore want to be careful about sunset...

Last reply: Emily Purcell, May 8, 2025, 10:07 am

How many CO2 Sensors do I need to place in occupied large space?

NC-2009 IEQc1: Outdoor Air Delivery Monitoring
posted by Mamun Ferdaus on Oct 30, 2015, 3:58 am

we have a project of around 20,000 sft and floor height 14 ft. its a textile project. 210 people work there. the space is ventilated by evaporative cooling system. how many...

Last reply: Claudiu Jipa, May 8, 2025, 7:58 am

LEED v4.1 Option 2 for LEED v4 compliance Electric vehicles

NC-v4 LTc8: Green vehicles
posted by Erik Heuler on May 7, 2025, 3:34 pm

There are some differences between LEED v4 and v4.1 requirements for Electric Vehicle charging. 

Does anyone know if Option 2 in v4.1 (EV ready infrastructure) can be used as an...

Last reply: Summer Minchew, May 7, 2025, 5:26 pm

Minimum Airquality Performance Mechanical Ventilation of Staircase and Elevator Landing

NC-v4 EQp1: Minimum indoor air quality performance
posted by Francesco Emanuele Contaldo on May 7, 2025, 10:28 am

Hi everyone and thanks in advance for your attention and support.
I am following the design of a manufacturing building, inside the building there are two pressurized elevator and stariwell...

Clarification on Conducting L&T Surveys in Residential Buildings

EBOM-v4 LTc1: Alternative Transportation
posted by Wafa Arif on Mar 25, 2025, 4:59 am

Dear All, 

I am executing a residential project pursuing LEED O&M v4: Multifamily, where we need to conduct the location and transportation survey, as well as the occupant comfort...

Last reply: Wafa Arif, May 7, 2025, 8:12 am

MERV 13 Filter for ERV

NC-v4 EQc1: Enhanced indoor air quality strategies
posted by Anne L on Mar 30, 2020, 6:00 am

We have a multifamily residential project which will have a stand alone ERV per unit, does anybody know if we need to install...

Last reply: Sonali Rawat, May 7, 2025, 2:10 am

Reporting Renewable Energy Savings in Energy Model vs. Renewable Energy Section (LEED v4 energy update)

NC-v4 EAc5: Renewable energy production
posted by Anurag Ghosh on May 3, 2025, 2:36 am

Hi all,

I’m working on a LEED v4 energy update project utilizing multiple...

Last reply: Marcus Sheffer, May 6, 2025, 2:20 pm