Extron SPK 14 Plenum (part number 22-155-02) — plenum-rated 14 AWG Extron speaker cable, listed here on a 500 foot (152 m) spool.

The plenum build of Extron's heaviest speaker gauge. Conductors are unchanged from the standard SPK 14: one pair of bare copper at 14 AWG apiece, with the raised strand count Extron applies across the SPK range so a thick cable still handles well. The difference sits in the jacket, which is rated for the air-handling spaces above a ceiling grid. Extron cautions that its plenum bulk cable is approved for North America and is not certified across most of Europe, so check regional approvals before you specify it.

Key Capabilities

• Plenum-rated SuperFlex jacket for return-air pathways
• One pair of bare copper conductors, 14 AWG each
• Sequential numbering printed along the jacket for measuring on site
• Listed as a 500 ft (152 m) spool rather than the full 1,000 foot reel
• Extron's current SPK 14 plenum listing is SPK14P/1000, part 22-155-03

Where It Is Used

Plenum-space loudspeaker runs in schools, universities, hospitals, corporate offices and public buildings, where local code requires a plenum-rated jacket in any void that carries return air, and where the heavier 14 AWG conductor suits the run length.

Specifications at a Glance

• Conductor gauge: 14 AWG
• Conductors: two, bare copper, one pair
• Jacket: SuperFlex, plenum rated, sequentially numbered
• Spool length as listed: 500 ft (152 m)
• Extron part number: 22-155-02

Availability note: Extron's current SPK 14 part number table shows only 1,000 foot spools, so this 500 foot plenum put-up is a legacy configuration — confirm with Ampronix before ordering. Extron plenum bulk cable is rated for North America and is not certified for use in most European countries. Also referenced as Extron SPK14P, SPK-14-Plenum, part number 2215502.