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    $199.95
    S-TL Thermaflex Flexible Hvac Duct - 18 Inch Diameter, 0526-1800-0002-10
    Global Industrial
    $199.95
    S-TL Thermaflex Flexible Hvac Duct - 18 Inch Diameter, 0526-1800-0002-10
    Global Industrial
    $1.36
    Poly Convection Tubing 6 Mil 18 in Diameter (Per Linear Ft)
    Agriculture Solutions LLC
    $1.36
    Poly Convection Tubing 6 Mil 18 in Diameter (Per Linear Ft)
    Agriculture Solutions LLC
    $209.00
    18 Inch X 5 Foot Pipe For Clamp Together Ducting
    Oneida Air Systems Inc.
    $209.00
    18 Inch X 5 Foot Pipe For Clamp Together Ducting
    Oneida Air Systems Inc.
    $26.02
    4 Inch Schedule 40 PVC Pipe - Rigid White PVC Plumbing Pipe For Drainage, Pool & Spa, Cold Water Applications - (4.5 Inch OD, 4.026 Inch ID) (18,
    Amazon.com
    Free shipping
    $26.02
    4 Inch Schedule 40 PVC Pipe - Rigid White PVC Plumbing Pipe For Drainage, Pool & Spa, Cold Water Applications - (4.5 Inch OD, 4.026 Inch ID) (18,
    Amazon.com
    $1,328.99
    18" Spears Schedule 40 PVC 90 Degree Elbow, 3706-180
    PVC Pipe Supplies
    $1,328.99
    18" Spears Schedule 40 PVC 90 Degree Elbow, 3706-180
    PVC Pipe Supplies
    $26.99
    1/2 in. X 18 in. Black Industrial Steel Grey Plumbing Pipe (6-Pack)
    Home Depot
    Free shipping
    $26.99
    1/2 in. X 18 in. Black Industrial Steel Grey Plumbing Pipe (6-Pack)
    Home Depot
    $22.99
    Pipe, Schedule 40, 17/64" ID, 316 SS, 18" L
    Zoro.com
    $22.99
    Pipe, Schedule 40, 17/64" ID, 316 SS, 18" L
    Zoro.com
    $23.99
    1 1/2 in. X 18 in. Galvanized Pipe
    Pipe Decor
    $23.99
    1 1/2 in. X 18 in. Galvanized Pipe
    Pipe Decor
    $243.18
    H&C Flex 13102518H 18" X 25' F218 Insulated Flex Duct (Silver Jacket) | Supplyhouse.Com
    SupplyHouse.com
    $243.18
    H&C Flex 13102518H 18" X 25' F218 Insulated Flex Duct (Silver Jacket) | Supplyhouse.Com
    SupplyHouse.com
    $1,963.99
    18" Spears Schedule 40 PVC Tee, 3701-180
    PVC Pipe Supplies
    $1,963.99
    18" Spears Schedule 40 PVC Tee, 3701-180
    PVC Pipe Supplies
    $499.60
    Nordfab Rigid Duct: Stainless Steel, For 18 in Duct Dia, 58 3/4 in Overall Lg, 20 Ga Material Thick Model: 8040206809
    Grainger
    $499.60
    Nordfab Rigid Duct: Stainless Steel, For 18 in Duct Dia, 58 3/4 in Overall Lg, 20 Ga Material Thick Model: 8040206809
    Grainger