What am I required to submeter for this credit?

For EAc5.1, there are no specific requirements. In your M&V plan, you will identify the uses you will submeter or monitor in order to confirm your energy savings. If you are pursuing Option 2 (Energy Conservation Measure Isolation), it may make sense to directly submeter the equipment in question. For the related tenant M&V credit, EAc5.2, tenant spaces must submetered or independently metered by the electric utility.

How can I choose between Option 1 (Calibrated Simulation) and Option 2 (Energy Conservation Measure Isolation)?

Option 2 is only appropriate for measures that are simple to analyze and that have few or no interaction with other building systems. For most new buildings and gut rehabs, there will be significant interaction between systems (such as lighting and HVAC) and Option 1 (simulation) will be the best option.

Our building has a green cleaning program and is earning an ID credit for it, based on the LEED-EBOM IEQc3 requirements. Can we skip the exhaust requirements for our janitor rooms?

LEEDuser has not seen an official ruling on this, but our expert consensus is no.

One, replacing a physical control with a policy control is a bit of a downgrade. Two, 100% avoidance of hazardous chemicals in cleaning is unlikely. The green cleaning purchasing credit in EBOM, for example, considers 30% good enough to earn the credit. Also, the thresholds, categories, and standards referenced in that credit will only go so far in preventing use of any cleaning supplies that might generate gases or chemicals that should be exhausted.

Can I use carpet tile as a track-off system? What about carpet?

Yes, carpet tile applies per LEED Interpretation Ruling #10252. Some project teams have preferred to use carpet tile due to ease of maintenance and avoidance of trip hazards. The carpet tile must be specifically designed for entryway systems. Regular carpeting that is not designed for this purpose and does not have regular cleaning is not applicable.

What does ‘regularly used exterior entrance’ mean and how do I know which of my building entrances falls under this category?

These entrances are those that are used by building occupants on a regular basis. If your project has unique circumstances where certain building entrances are not regularly used or do not serve building occupants, they may be excluded. For example, emergency exits that are not used as regular entrances can often be excluded.

I do not have 10' of space inside my building entrance to install a walk-off system. Can I include one on the exterior? Can the shape be irregular?

LEED Interpretation #10098, dated 8/1/2011, states that "The intent for the entryway system (grilles, grates, walk-off mats) is to capture dirt and dust. An exception to the 10 foot length and/or indoor location is acceptable provided your alternative solution meets this intent and is thoroughly justified."