(877) 620-8258 mfgquote@gensco.com H V A C S H E E T M E T A L & S P E C I A L T Y P R O D U C T S 21 PLENUM TO ROUND TRANSITION Furnace Sub-Base Size Code 17 3/4” x 28 1/4” DS 17 DOWNFLOW SUB-BASE Air Handler Sub-Base Size Code 20 1/2" x 18 1/2" DS AH 18 21 1/2" x 21" DS AH 21 23 1/2" x 21" DS AH 23 26" x 21" DS AH 26 Air Handler Drops Sub-Base Code DS AH 21 RD 19 18 16 DS AH 23 RD 21 21 16 ROUND DROPS • 26 Gauge Construction • 16” Round x 3” wide collar • 24 Gauge Construction • “Slide-in-place” flange • 5” tall • 1” flange out for installation • Pre-assembled Plenum Size Round 14” 16” 18” 13 1/2” x 20” PLE 14 14 RD 16 1/2” x 20” PLE 17 14 RD PLE 17 16 RD PLE 17 18 RD • 26 Gauge Construction • “S” and drive Connection • 16” Tall
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