On past project we have been told: Please note that Figure 5.2.1.1 can only be used when air speeds are less than 40 feet per minute.
We have a project with air speeds at 40 fpm. So does that mean we can't use Figure 5.2.1.1.? Or is it just above 40 fpm? Thanks!
Cam Fitzgerald
Energy Engineer7group
25 thumbs up
June 13, 2014 - 7:23 am
The air speed cannot be greater than 40 fpm. This is stated in the third paragraph of Section 5.2.1.1.
serge sidoroff
Director of Environmental projectsPenicaud Green Building - edeis group
1 thumbs up
June 13, 2014 - 8:09 am
No : this § states that the figure 5.2.1.1 does apply when the air speed is below 40fpm. Section 5.2.3 states explicitely that "this standard allows elevated air speed to be used ... under certain conditions", whereas section 5.2.3.1 explains how to deal with these conditions. I encourage you to download the addendum b of the 2007 version or to buy the 2013 version, since all this parts have been deeply updated.
Nelina Loiselle
Above Green239 thumbs up
June 13, 2014 - 3:26 pm
So we can or can't use Figure 5.2.1.1 for air speeds of 40 fpm?
serge sidoroff
Director of Environmental projectsPenicaud Green Building - edeis group
1 thumbs up
June 16, 2014 - 6:48 am
It will depend on the version of the standard you want to use and to the interpretation you will make. Shortly :
- 2010 version without addendum b : "figure 5.2.1.1 specifies comfort zone for environments ... and where the air speeds are not greater than 40 fpm"
My understanding is that 40 fpm complies with this statement.
- 2010 version with addendum b : the statement "and where the air speeds are not greater than 40 fpm" is deleted.
- 2013 version : (§5.2.1 becomes §5.3.1) "Average air speed greater than 40 fpm requires the use of section 5.3.3".
My understanding is that 40 fpm does not require the use of section 5.3.3 (and therefore allows to use the figure 5.2.1.1, renamed 5.3.1 in the 2013 version)
USGBC allows you to use the standard "with errata but without addenda". My opinion is that you can choose to use errata if it is better for you, but then you will have to use all of them (which is rather handsome for the 55.2-2010 ...) or it's more simple to use the 2013 version.
I hope it will help
Nelina Loiselle
Above Green239 thumbs up
June 16, 2014 - 11:43 am
Thank you Serge. Yes I agree sounds like I can use 5.2.1.1 because it does that speeds GREATER then 40fpm and 40 is not greater then 40 :)