In plain English
FAR 52.222-49, Service Contract Labor Standards-Place of Performance Unknown, is a contract clause prescribed at FAR 22.100, most recently dated May 2014. The complete official text is reproduced below, verbatim, from GSA's published FAR source files.
Its text contains no sentence requiring insertion into subcontracts; see the flowdown section below for what that does and does not mean.
Does it flow down to subcontracts?
No flowdown mandate found in the clause text
We scanned the full clause text and found no sentence directing the contractor to insert this clause into subcontracts. That is a statement about the text, not legal advice: a prime contractor may still flow terms down contractually, an agency supplement (DFARS, VAAR, …) may add requirements, and clauses listed below (if any) may order this clause into subcontracts from the outside.
Where it's prescribed
As prescribed in 22.1006(f), insert the following clause:
Prescribing reference: FAR 22.100.
The official text, verbatim
As prescribed in 22.1006(f), insert the following clause:
Service Contract Labor Standards-Place of Performance Unknown (May 2014)
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(a) This contract is subject to the Service Contract Labor Standards statute, and the place of performance was unknown when the solicitation was issued. In addition to places or areas identified in wage determinations, if any, attached to the solicitation, wage determinations have also been requested for the following: ________ [insert places or areas]. The Contracting Officer will request wage determinations for additional places or areas of performance if asked to do so in writing by _____________ [insert time and date].
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(b) Offerors who intend to perform in a place or area of performance for which a wage determination has not been attached or requested may nevertheless submit bids or proposals. However, a wage determination shall be requested and incorporated in the resultant contract retroactive to the date of contract award, and there shall be no adjustment in the contract price.
(End of clause)