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Interior of a dirty rectangular hvac air duct showing a narrow dark passage with rough stone walls and debris on the floor

Interior of a dirty rectangular hvac air duct showing a narrow dark passage with rough stone walls and debris on the floor

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HVACductairventilationtunnelpassagedebrisrectangularchannelairflowindustrialbuildingconstructioninfrastructuremaintenanceinspectioncleaningfilterdustgrimesootceilingenclosedconfinedinteriorconcretestonedarkNarrowroughtexturesurfacewallfloorstraightdepthperspectiveshadowdimgray

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Interior of a dirty rectangular hvac air duct showing fibrous insulation and grime buildup
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