{"product_id":"100mm-75mm-duct-reducer-adapter-hvac-pipe-fitting","title":"100mm to 75mm Duct Reducer Adapter – HVAC Pipe Fitting","description":"\n\u003ch2\u003e100mm to 75mm Duct Reducer \u0026amp; Increaser Adapter\u003c\/h2\u003e\n\u003cp\u003eBridge two different-sized ducts with ease using this \u003cstrong\u003e100mm to 75mm (4-inch to 3-inch) Duct Reducer Adapter\u003c\/strong\u003e. Crafted from lightweight, durable plastic, this connector creates a seamless, airtight transition in any ventilation system — whether you're upgrading a bathroom exhaust fan, optimizing kitchen airflow, or fitting out a hotel HVAC system. Its simple push-fit design means no tools, no fuss, and no professional required.\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eUniversal Fit:\u003c\/strong\u003e Connects 100mm (4-inch) to 75mm (3-inch) circular ductwork for a smooth, seamless airflow transition.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDurable Plastic Construction:\u003c\/strong\u003e Lightweight yet tough material stands up to everyday use in humid and temperature-variable environments.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eEasy Tool-Free Installation:\u003c\/strong\u003e Simply slide each end onto the appropriate duct pipe — no special tools or hardware needed.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCompact Profile:\u003c\/strong\u003e Height of 80mm (3.15 inches) keeps the adapter low-profile and tidy within any duct run.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eVersatile Use:\u003c\/strong\u003e Ideal for bathrooms, kitchens, apartments, home offices, hotels, and commercial HVAC systems.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eClean White Finish:\u003c\/strong\u003e Blends neatly with standard white ductwork and interior fittings.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003ctable\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eConnection Size\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e100mm (4 inch) → 75mm (3 inch)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eHeight\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e80mm \/ 3.15 inch\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMaterial\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003ePlastic\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eColor\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eWhite\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eType\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eReducer \/ Increaser\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eOrigin\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eMade in China\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eWhat's in the Box?\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e1 × 100mm–75mm Duct Reducer Adapter\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eCompatible Applications\u003c\/h3\u003e\n\u003cp\u003eThis adapter fits perfectly into residential and commercial ventilation setups, including bathroom exhaust fans, kitchen range hoods, inline duct fans, whole-house ventilation systems, and hotel\/apartment HVAC ductwork.\u003c\/p\u003e\n\n\u003cp\u003eFor guidance on proper ventilation standards and indoor air quality, visit the \u003ca href=\"https:\/\/www.epa.gov\/indoor-air-quality-iaq\/improving-indoor-air-quality\" target=\"_blank\" rel=\"noopener noreferrer\"\u003eEPA's Indoor Air Quality resource\u003c\/a\u003e.\u003c\/p\u003e\n\n\u003ch3\u003eRelated Products You May Like\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/10-mode-garden-hose-nozzle-high-pressure-spray-gun\"\u003e10-Mode Garden Hose Nozzle – High-Pressure Spray Gun\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/1-4-inch-npt-nickel-plated-brass-air-compressor-tank-fill-valve\"\u003e1\/4\" NPT Nickel Plated Brass Air Compressor Tank Fill Valve\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/hex-shank-wire-twister-drill-attachment-rebar-tie-tool\"\u003e1\/4\" Hex Shank Wire Twister Drill Attachment | Rebar Tie Tool\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cem\u003eNote: Please allow for slight dimensional variances due to manual measurement. Colors may vary slightly depending on monitor settings.\u003c\/em\u003e\u003c\/p\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003ch4\u003eQ: Will this 100mm to 75mm duct reducer adapter fit standard round ductwork?\u003c\/h4\u003e\n\u003cp\u003eA: Yes. This adapter is designed specifically for standard circular duct systems, connecting a 100mm (4-inch) duct on one end to a 75mm (3-inch) duct on the other. It is compatible with most rigid and flexible round duct tubing used in residential and commercial HVAC systems.\u003c\/p\u003e\n\n\u003ch4\u003eQ: Do I need any special tools or glue to install this duct reducer?\u003c\/h4\u003e\n\u003cp\u003eA: No special tools are needed. Simply push each end of the adapter onto the appropriate duct pipe. For extra security in high-airflow applications, duct tape or HVAC foil tape can be used around the joints, though it is not typically required for standard installations.\u003c\/p\u003e\n\n\u003ch4\u003eQ: Is this duct adapter suitable for bathroom exhaust fans and kitchen range hoods?\u003c\/h4\u003e\n\u003cp\u003eA: Absolutely. This reducer is well-suited for bathroom exhaust ventilation, kitchen range hoods, inline duct fans, and any application where two different-sized ducts need to be joined. It also works in hotel HVAC systems, apartments, and office ventilation setups.\u003c\/p\u003e\n\n\u003ch4\u003eQ: Can this adapter handle humid or warm air environments?\u003c\/h4\u003e\n\u003cp\u003eA: Yes. The durable plastic construction is designed to withstand the humidity and temperature variations typical of bathroom and kitchen ventilation systems, making it a reliable long-term fitting for these environments.\u003c\/p\u003e\n\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"Will this 100mm to 75mm duct reducer adapter fit standard round ductwork?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Yes. This adapter is designed specifically for standard circular duct systems, connecting a 100mm (4-inch) duct on one end to a 75mm (3-inch) duct on the other. 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The durable plastic construction is designed to withstand the humidity and temperature variations typical of bathroom and kitchen ventilation systems, making it a reliable long-term fitting for these environments.\"}}]}\u003c\/script\u003e\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"BreadcrumbList\", \"itemListElement\": [{\"@type\": \"ListItem\", \"position\": 1, \"name\": \"Home\", \"item\": \"https:\/\/0i45ne-c8.myshopify.com\/\"}, {\"@type\": \"ListItem\", \"position\": 2, \"name\": \"Fasteners \u0026 Electrical\", \"item\": \"https:\/\/0i45ne-c8.myshopify.com\/collections\/fasteners-electrical\"}, {\"@type\": \"ListItem\", \"position\": 3, \"name\": \"100mm to 75mm Duct Reducer Adapter – HVAC Pipe Fitting\", \"item\": \"https:\/\/0i45ne-c8.myshopify.com\/products\/100mm-75mm-duct-reducer-adapter-hvac-pipe-fitting\"}]}\u003c\/script\u003e","brand":"Zpaxo","offers":[{"title":"Default Title","offer_id":54164892156214,"sku":"\u003cnone\u003e","price":11.28,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0989\/7774\/3158\/files\/Sa1ef6f704f36435fa4f82989cdd05181N.webp?v=1782615968","url":"https:\/\/0i45ne-c8.myshopify.com\/products\/100mm-75mm-duct-reducer-adapter-hvac-pipe-fitting","provider":"Zpaxo","version":"1.0","type":"link"}