Number of HEPA filter in a room

ifserav

Involved In Discussions
#1
Good day

I need information, s there any regulation where be established the number of HEPA filter according to the ISO classification?

Thanks in advance

Sergio Ávila
 
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Ajit Basrur

Staff member
Admin
#2
I have not seen any regulation on the number of HEPA filters in a room. Typically, it depends on the number of air changes you intend to have in the clean room; so greater the number of HEPA filters, greater are the air changes.
 

cward

Registered
#3
I have not seen any regulation on the number of HEPA filters in a room. Typically, it depends on the number of air changes you intend to have in the clean room; so greater the number of HEPA filters, greater are the air changes.
Would you know or know how I could find out how many air changes I would need for a class 8 cleanroom?
 
#5
I have not seen any regulation on the number of HEPA filters in a room. Typically, it depends on the number of air changes you intend to have in the clean room; so greater the number of HEPA filters, greater are the air changes.
Hi,

Just wanted to ask if there is any ISO standard requirement for air changes or is it just a simple design element for the HVAC manufacturer?

Thanks!
 

Ninja

Looking for Reality
Trusted Information Resource
#7
I agree with Ajit... but don't lose sight of one particular fact... "The purpose" as it were.

It isn't about number of inlets (filters).
It isn't about number of air changes.
It's about the air. (It's about whether or not the result meets the needs.)
All the rest are tools you use to get there.

As I've said before, my living room (No HEPA, curtains, carpet, upholstered furniture, plants) is ISO8.
 

Ajit Basrur

Staff member
Admin
#8
Ninja hit the nail on the head!

Before you decide on how many HEPA filters to be used, there are other parameters namely, which cleanroom class are you looking for (ISO Class 5, or 7, 8 etc.), what is the process to be employed in the cleanroom, does that process generate particles and is it heavy or moderate or low; number of air changes needed to keep the room "clean" (meet the particulate and if required, microbiological; type of HEPA filter; type of filtration etc.

Your cleanroom experts will have all this info. And as Ninja explained, it is paramount that the quality of air must meet the requirements.
 
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