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CS-2009 EAp2:Minimum Energy Performance

Fresh air for toilet vestibule according to ASHRAE 62.1-2010

Dear Everyone

I am writing regarding to fresh air requirements for Baseline Case. According to new ASHRAE 90.1-2010 requirement it should be modeled according to rating authority or building official. If we compare with ASHRAE 62.1-2010 requirement we were asked in few projects during Review project to include fresh air quantities to be consistent with values reported in Minimum IAQ calculator. 

ASHRAE 62.1 - 2010 requires to design exhaust air volumes for toilets. In our project there is a special designed AHU which serves toilet spaces. AHU includes required exhaust airflow rate and the same quantity of fresh air which is supplied to vestibules to compensate exhaust rate.

ASHRAE does not require fresh air for toilet and in IAQ calculator we may eventually include fresh air for vestibules and assign them as corridor with 0.3 L/s/m2 requirement which is our method. This airflow is much more lower than required exhaust.

The question is if we can get savings by include the fresh air volume for vestibules as equal to exhaust rate required by ASHRAE 62.1 and if we can include that air somehow in IAQ calculator. 

Best Regards

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Marcus Sheffer
LEED Fellow
7group / Energy Opportunities
LEEDuser Expert
4454 thumbs up

Wed, 04/10/2019 - 19:36

First of all I can't even picture what a vestibule is for a toilet?  That aside. The toilets should not be included in the IAQ Calculator as they are typically exhaust only. That exhaust is modeled identically in both models. Essentially the baseline OA for the vestibule should be based on the ASHRAE 62.1 calculation and the proposed is based on the actual design.

Sat, 06/14/2025 - 11:19

Thankyou joining LEEDuser. Q. Hotel room vestibule having pantry exhaust say 80 cfm.Toilet inside exhaust at 2 points I.e.1at shower say 30 cfm 2. at toilet seat 30 cfm. Treated fresh air being supplied to room 120 cfm. Room air conditioning thru fan coil unit ( 600 cfm) How balance exhaust air and fresh air incase 1. When pantry oven burner is not in use. But toilet exhaust operational. 2. Pantry oven burner and toilet exhaust both r in operation. Need to maintain negative pressure of vestibule and toilet. However room air-conditioning is in operation . Looking forward reply by tomorrow solution with scheme diagram.Ashrae standard 62.2 pdf page or any other reference to be implied in INDIA . Would be highly appreciated. Thanks & regards

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