How to determine no of sampling points in a Class D Room for particle counts?

Mean if we have 12x12x12 room at how many points we will take air samples?

if area is 12x12=144 squre meter , sampling locaton will be 19.

how?wts the formula?

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No. of Sampling Point= 27 [ Area of Room]

/1000

there will be 27 in place of 257 and this formula is applicable for only room area greater than1000.

pls refer updated ISO guideline 2015 for more detail.

Mean we have to folow chart there is no equation for area less than 1000?

Yes you should follow this.