Hi All,
We would like to get your opinion in the situation below if approach is acceptable to IEQp1:
We have an enclosed Driver’s lounge, Lift lobbies and Administration office at the Basement floors. The Owner wants to remove the duct for outdoor air supply of these areas and instead, get outdoor air supply from the ventilated air from the basement parking. Will this be acceptable if Carbon Monoxide (CO) sensors will be installed at the basement parking to trigger an alarm at 8 to 9 ppm reading (to make sure air is not contaminated)? The alarm will then trigger jet fans to ventilate the CO concentration in the basement. We are currently getting confirmation from the consultants if the 8 to 9 ppm level is not routinely encountered at the basement to make sure that the jet fans will not be required to operate more frequent than normal.
The basis for the 9ppm is the ASHRAE 62.1-2007 table 4-1 for National Primary Ambient Air Quality Standards for Outdoor Air as Set by the U.S. Environmental Protection Agency.
Outdoor air shaft is actually available. The Owner only wants to remove the ducts serving the above-mentioned areas from the outdoor air shaft for value engineering.
Dylan Connelly
Mechanical EngineerIntegral Group
LEEDuser Expert
472 thumbs up
January 23, 2017 - 10:07 am
I think the answer is that you should rejected that VE.
The lounge, lobbies, and admin spaces need dedicated outside supplies. They can't get transfer air from the basement parking. They can all use the same outdoor air shaft, but those 3 other spaces would need a duct run from the common outdoor air shaft.