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Typically, Double Branches taper as the new line enters the main line. This is because the new line is bringing in more air. The exiting part of the branch (toward the fan) is therefore bigger to accommodate the increase in air. The new line typically enters at 30 or 45 degree so as to 'merge' into the air flow.
Double Branch Wyes
Unit of Measure
1 

Item #

Item Name

Diameter

Angle

Material Thickness

Materials

BD033 N/A 3 Inch (in) Diameter Double Branch Wye N/A 3 in N/A 30 º45 º90 º N/A 18 gauge N/A Available in Galvanized or SS
BD043 N/A 4 Inch (in) Diameter Double Branch Wye N/A 4 in N/A 30 º45 º90 º N/A 18 gauge N/A Available in Galvanized or SS
BD053 N/A 5 Inch (in) Diameter Double Branch Wye N/A 5 in N/A 30 º45 º90 º N/A 18 gauge N/A Available in Galvanized or SS
BD063 N/A 6 Inch (in) Diameter Double Branch Wye N/A 6 in N/A 30 º45 º90 º N/A 18 gauge N/A Available in Galvanized or SS
BD073 N/A 7 Inch (in) Diameter Double Branch Wye N/A 7 in N/A 30 º45 º90 º N/A 18 gauge N/A Available in Galvanized or SS
BD083 N/A 8 Inch (in) Diameter Double Branch Wye N/A 8 in N/A 30 º45 º90 º N/A 18 gauge N/A Available in Galvanized or SS
BD093 N/A 9 Inch (in) Diameter Double Branch Wye N/A 9 in N/A 30 º45 º90 º N/A 18 gauge N/A Available in Galvanized or SS
BD103 N/A 10 Inch (in) Diameter Double Branch Wye N/A 10 in N/A 30 º45 º90 º N/A 18 gauge N/A Available in Galvanized or SS
BD113 N/A 11 Inch (in) Diameter Double Branch Wye N/A 11 in N/A 30 º45 º90 º N/A 18 gauge N/A Available in Galvanized or SS
BD123 N/A 12 Inch (in) Diameter Double Branch Wye N/A 12 in N/A 30 º45 º90 º N/A 18 gauge N/A Available in Galvanized or SS
BD133 N/A 13 Inch (in) Diameter Double Branch Wye N/A 13 in N/A 30 º45 º90 º N/A 18 gauge N/A Available in Galvanized or SS
BD143 N/A 14 Inch (in) Diameter Double Branch Wye N/A 14 in N/A 30 º45 º90 º N/A 18 gauge N/A Available in Galvanized or SS
BD153 N/A 15 Inch (in) Diameter Double Branch Wye N/A 15 in N/A 30 º45 º90 º N/A 18 gauge N/A Available in Galvanized or SS
BD163 N/A 16 Inch (in) Diameter Double Branch Wye N/A 16 in N/A 30 º45 º90 º N/A 18 gauge N/A Available in Galvanized or SS
BD173 N/A 17 Inch (in) Diameter Double Branch Wye N/A 17 in N/A 30 º45 º90 º N/A 18 gauge N/A Available in Galvanized or SS
BD183 N/A 18 Inch (in) Diameter Double Branch Wye N/A 18 in N/A 30 º45 º90 º N/A 18 gauge N/A Available in Galvanized or SS
BD193 N/A 19 Inch (in) Diameter Double Branch Wye N/A 19 in N/A 30 º45 º90 º N/A 18 gauge N/A Available in Galvanized or SS
BD203 N/A 20 Inch (in) Diameter Double Branch Wye N/A 20 in N/A 30 º45 º90 º N/A 18 gauge N/A Available in Galvanized or SS
BD223 N/A 22 Inch (in) Diameter Double Branch Wye N/A 22 in N/A 30 º45 º90 º N/A 18 gauge N/A Available in Galvanized or SS
BD243 N/A 24 Inch (in) Diameter Double Branch Wye N/A 24 in N/A 30 º45 º90 º N/A 18 gauge N/A Available in Galvanized or SS
Unit of Measure
1