Input F-Factor for Slab-on-grade floor in eQUEST?

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Hi all,

ASHRAE 90.1 defines baseline slab-on-grade floor conduction by F-factor, but
it seems eQUEST uses U-factor to calculate ground (and perimeter maybe) heat
transfer (link to a construction like other surface type). There is a
?Slab-on-Grade F-Factor? box in dialog,
but the value is not editable. Does anyone know how to input a known
f-factor for slab-on-grade floor in eQUEST? Many thanks.

Regards

Yu Liu

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