Hi to all of you,
as per Standard 62.1-2007, in Section 5.9, one of the minimum requirements for mechanically ventilated spaces, a MERV 6 filter shall be provided upstream of all cooling coils. ...,
How strict is this situation if the units are VRF evaporators?, since they have very little pressure available and the filters would cause a big drop of it.
thank you
Dylan Connelly
Mechanical EngineerIntegral Group
LEEDuser Expert
472 thumbs up
January 10, 2012 - 11:16 am
We have run into this on a number of projects. As this is a pre-req we have not pushed back on this requirement and always included at least MERV 6, but usually MERV 8 filters.
Consider:
Oversizing the ductwork (if there is any) will help reduce pressure drop,
creating an oversized plenum filter box to reduce the FPM across the filter, or
select a higher static VRF unit.