Dear Leed user team,
This question concerns the exhaust rate for toilets of an new office building.
It's an office building of 35 000 square feet, registered in Leed v4 certification.
The office building has on each floor a toilet block, composed by:
- a common space with washbasins and faucets
- several separate toilet (separate by partitions and door)
The office building will be occupied only by tenants (the employees).
The project must respect the Standard 62.1-2013. This standard describes in TABLE 6.5 the Minimum Exhaust Rates.
1. Could you please guide me about the toilet type must be apply:
- toilet private (25/50 cfm/unit)
- toilet public (50/70 cfm/unit)
2. If the answer is the case of toilet private, and with continuous system ventilation (07 am to 22 pm), can I use the lower rate?
3. If the answer is the case of toilet public, and with continuous system ventilation (07 am to 22 pm), which rate must i use?
Thank you in advance for your return.
Kind regards,
Christophe
Jon Clifford
LEED-AP BD+CGREENSQUARE
LEEDuser Expert
323 thumbs up
April 28, 2015 - 11:43 pm
I do not have access to ASHRAE-62.1-2013, but I am looking at ASHRAE-62.1-2010, which is cited in the Requirements language for Option 1of this Prerequisite. In the 2010 version, Table 6-4 lists Minimum Exhaust Rates. This Table has a “Notes” column that keys to footnotes at the bottom of the table. Footnotes D & E, respectively, define public & private toilets and explain when to use the high and the low exhaust rates.
The layout of this table in the 2013 version may differ, but I would guess that the requirements have not changed much. The answers to your questions should by in the table or in the associated text.
Make sure that you are using the correct version and the applicable sections of ASHRAE-62.1 for LEED-CSv4.
CHRISTOPHE MATHIEU
Sustainable Design And Construction Consultants, Paris, Francegreenaffair
2 thumbs up
April 29, 2015 - 3:23 am
Hello Jon,
I observe 'Notes' D and E of table 6-4 (2010) and 6-5 (2013).
So, for an office building, with sanitary blocks as describe in my first post, we are in the case of like in theatres, schools and sports (Way D) or toilet room intended to be occupied by one person at a time (Way E).
I think the definition D is the closest, but i would like to have a confirmation from an expert.
Ammon Palmer
Mechanical EngineerCTA Architects Engineers
2 thumbs up
December 14, 2015 - 5:37 pm
My experience with ASHRAE 62.1 would lead me to believe that the office building as described would be a public toilet since as you pointed out it is intended to be used by more than one person at any given time. That would put you in Note D. The reference in note D to the theatres, schools, and sports has reference to the way that the toilets are used. In any of the three examples cited, occupants flood to the toilets at break times. Those times are when the higher exhaust rates would be required. If you are in a typical office where people can go to the toilet when required or that has a staggered break time, I would estimate that the lower value would meet the intent.