This might be a rather simple question, but would like avoid confusion.

G3.1.2.10 says ER is needed when design cfm >5000 and more than 70% OA. I wonder does this mean the proposed or baseline design cfm? Our proposed design uses chilled-beam w/100% OA in the DOAS.

Hello All, I have two questions about compliance with the mandatory provision: 1) Only the main air conditioning system should be evaluated with the tables in chapter 6?

Our project is G+3 factory building and it is a major renovation and we are renovated wall, window, HVAC equipment and we consider ASHRAE 90.1.2007 Building envelope for base case & renovated

I am modelling a large multi use building where the peak occupancy never rises above ~70%. Different areas of the building are used on different days but never all at once.

If a project is being demolished but the slab and some columns are being kept, would that be considered a major renovation since we are not given the option of redesigning the orientation of the bu

G3.1.1, Exception "d" requires laboratory spaces with a minimum of 5000 cfm of exhaust to use a baseline system type 5 or 7 that reduce the exhaust and makeup air volume to 50% of design values dur

G3.1.2.5 states: Ventilation.

Our Proposed project (LEED 2009 NC) has a hybrid service hot water system that uses a water-source heat pump as the primary hot water generator and has a heat exchanger as a backup downstream of t

Hello, The model I'm working on has instant electric water heaters, per 90.1 7.4.2 Equipment Efficiency, "Equipment not listed in Table 7.8 has no minimum performance requirements." Electr