Tees 90°
Plain Tee, 180° Cross Tee & 135° Cross Tee
Plain Tee
(T-1)
Dimensions to be listed in order of A, D
180° Cross Tee
(T-2-180)
Dimensions to be listed in order of A, C, D
135° Cross Tee
(T-2-135)
Typical radial angle shown.
Any angle available.
Dimensions to be listed in order of A, C, D
Double Parallel Tee, 90° 4-Branch Cross Tee’s – 90° & 135° 4-Branch Cross
Double Parallel Tee
(T-2-P)
Dimensions to be listed in order of A, C, D
90° 4-Branch Cross
(T-4-90)
Typical radial angle shown.
Any angle available.
Dimensions to be listed in order of A, C, D, E, F
135° 4-Branch Cross
(T-4-135)
Typical radial angle shown.
Any angle available.
Dimensions to be listed in order of A, C, D, E, F
180° 4-Branch Cross Tee, Reducing Tee & 180° Reducing Cross Tee
180° 4 Branch Cross
(T-4-180)
Typical radial angle shown.
Any angle available.
Dimensions to be listed in order of A, C, D, E, F
(T-1-R)
Dimensions to be listed in order of A, B, D
180° Reducing Cross
(T-2-R-180)
Typical radial angle shown.
Any angle available.
Dimensions to be listed in order of A, B, C, D
Airflow Tee & Reducing Airflow Tee
Airflow Tee
(AFT-1)
Dimensions to be listed in order of A, D
Reducing Airflow Tee
(AFT-1-R)
Dimensions to be listed in order of A, B, D
Engineering Note
Recommended for HVAC only.
Close coupling of elbows and branch fittings should be avoided if at all possible. The total pressure loss of two close-coupled fittings will generally be greater than the sum of the individual fitting losses. For example: both the 45° lateral and 45° elbow individually are proved to be low loss fittings. However, when they are joined to form a 90° branch, the combined performance is not as good as a conical tee or the airflow tee. This is a particularly important point to consider because the airflow tee (this page) or conical tee (next page) is less expensive and is more compact than the combination lateral-elbow. For best economy, the designer should use the conical tee or combination tee when low branch losses are important; and the straight 90° tee should be used when a higher loss fitting can be tolerated.
Conical Tee, Conical Reducing Tee & Bullhead Tee
Conical Tee
(T-1-C)
Dimensions to be listed in order of A, D
Conical Reducing Tee
(C-1-C-R)
Dimensions to be listed in order of A, B, D
Bullhead Tee
