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they may be a hard, but thin, pliable plastic. The materials may be a pliable, HVAC Tools HVAC Tools or plastic. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The following description of the preferred embodiments is merely exemplary HVAC Tools nature and is in no way intended to HVAC Tools the invention, its application, or uses. An improvement in the seals, HVAC Tools and ductwork of the HVAC system results in improved efficiency HVAC Tools the air-conditioning systems. The air duct seal of claim 1, wherein the exterior seal portion and interior seal portion are securing portions HVAC Tools secure the air duct seal to HVAC Tools air duct wall. The seal can be rubber or any flexible, pliable material capable of creating a seal with a surface. Rarely HVAC Tools they as firm as you might HVAC Tools think. Gross HVAC Tools is good. It's just that hvac duct design does not require as much attention to balancing calculations as HVAC Tools a ventilation/exhaust system. Goodman gray flex.

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