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The two stage would only reduce the noise in low stage.

The "Fiberglass" vanes would help in high or low stage.

For your contractor the Quieturn Vanes are from www.durodyne.com
lokk for the...

To reduce noise at return grilles ,there should be two ninty degree elbows between the furnace and the return grille.If not there are sound absorbing turning vanes that can be installed.

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