Square duct ... $2.00 / lb
Flat oval pipe ... $2.75 / lb
Flat oval fittings ... $3.25 / lb
Spiral duct ... $1.75 / lb
Spiral fittings ... $2.25 / lb
Double wall ... $5.50 / lb
Black iron (welded) ... $5.00 / lb
Stainless steel ... $8.00 / lb
Aluminium ... $10.50 / lb
Acoustic liner ... $2.00 / sq.ft