4" to 3" Inch Round Duct Reducer - Male Fit - Galvanized Steel Pipe Increaser - Coupling for Round Duct Ventilation Systems - Heating & Cooling, HVAC VOMENC Circadian Rhythm & Health-Centric Lighting:

Circadian Rhythm & Health-Centric Lighting: Mimic natural light with a color temperature ranging from 2

DELICATE PACKAGING - Comes with gift box and user instruction

which saves a lot of time fixing the crossbeam

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4" to 3" Inch Round Duct Reducer - Male Fit - Galvanized Steel Pipe Increaser - Coupling for Round Duct Ventilation Systems - Heating & Cooling, HVAC VOMENC Circadian Rhythm & Health-Centric Lighting:Brand: HVAC OV Color: Gray Features: This is a very practical, robust, solid duct reducer or increaser which can be used when connecting two different size solid or flexible ducts. Details: HVAC OV works with manufacturers, markets and distributes products and system solutions for simplified construction and improved indoor climate. The products are characterised by their quality, ease of assembly and consideration towards the environment. We simplify