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"The steel return air grille is not completely flat. The front service is around ~0.4 inches from the wall, where it covers the opening of the duct.We've got a massive range of return air grilles, which you can browse here."
<https://hvacpremium.com/products/5-8in-insulated-copper-coil-line-seamless-pipe-tube-for-hvac-refrigerant-1-2in-black-insulation-25-long>