You have determined that the equipment room (ER) you are designing will be the minimum size of 15 sq m (160 sq ft) and is servicing 80 but architectural changes will add 175 , which will require you…

TIA-569 defines equipment room minimum floor areas based on the number of work areas served, and its sizing table indicates that accommodating the additional horizontal cross-connect hardware needed for the expanded 255 total work areas requires increasing the ER from 15 sq m to 18 sq m (193 sq ft). The incremental increase accounts for the termination blocks, patch panels, and active equipment associated with the added HC, without over-provisioning space beyond the standard's requirements for this work area count. Larger options do not correspond to TIA-569 sizing tiers applicable to this scenario.

23 sq m (250 sq ft) exceeds the TIA-569 space requirement for the total work area count and single HC addition described and would over-provision the room.

31 sq m (330 sq ft) corresponds to a TIA-569 sizing tier for a significantly larger number of work areas than the 255 total in this scenario.

37 sq m (400 sq ft) far exceeds what TIA-569 requires for an ER serving 255 work areas with one horizontal cross-connect.

47 sq m (500 sq ft) is appropriate for very large campus equipment rooms well beyond the scope of the 255 work area count described.