|
US2020348042A1
|
|
Rectangular duct
|
|
US2015260426A1
|
|
Sealed and/or reinforced flanged ring connector for single- and double-wall HVAC ducting
|
|
WO2011066298A1
|
|
Standing seam connectors for ducting
|
|
EP2100080A2
|
|
Rectangular/square spiral ducting systems with flange connectors and method of making the same
|
|
US2008134745A1
|
|
Rectangular/square spiral ducting systems with flange connectors
|
|
US7124609B1
|
|
Spin forming of HVAC duct reducers
|
|
US7163030B2
|
|
Rectangular and square double wall ducting systems
|
|
US7104104B1
|
|
Rectangular and square ducting systems
|
|
GB9616797D0
|
|
Circular and oval flanged rings for connecting ducting and method of making
|
