DC Duct question - Wye, Wye, Wye (Delilah)

Doug Shepard

In Memorium
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772
Location
Waterford, MI
Been web surfing for DC duct stuff this week and ran across a question on the Wye's. I've noticed there are Pant-Leg Wye's and Lateral Wye's. It looks to my untrained eye that the Pant-Leg type would have less turbulence or air-flow issues, but all the DC system pics I've looked at and Bill Pentz site dont seem to mention or use them. Anybody know if one is better than the other for splitting the main line into it's branches?
 
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