Insulated Register Boxes
Codes: F=flange,NF=no flange,FG=flange & gasket
FS=slant w/flange,FA=angle w/flange

3500f 3600f 3600nf3600nf
  3500F          3600F            3600NF         3600NF
3700nf 3800f 3600fg 3800fg
3700NF         3800F          3600FG      3800FG
3700s 3600fa
3700FS         3600FA
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3500-3600 info  3700-3800 info