NORDFAB Reducer: 10 in x 4 in Duct Fitting Dia, 12 in Duct Fitting Lg - 40D560|8040025887 - Grainger
LB White Duct Adapter | QC Supply
Abs Duct Fan Connector Wall Range Hood Flange Adapter Kitchen Air Vent Exhaust Hood 100/120/150/200mm For Ventilation System - Pipe Fittings - AliExpress
001-037 3" trans adapter for warm air
AC INFINITY Duct Reducer, 8-Inch to 6-Inch Adapter Cone, Galvanized Steel - AC Infinity
Round Duct Connector, Model RDC-8, 8 In Dia, For Models SP/CSP, Product # RDC-8 | Greenheck
8 X 5 Vent Pipe Reducer - HVAC Ductwork Sheet Metal - Indoor Comfort Supply
HVAC Tapered Duct Reducer - Galvanized Steel | FAMCO
Hose, Machine, Flanged Duct Connectors | US Duct
Duct Inline Reducer Increaser Connector to Vent Adapter 3 4 5 6 Inch // 80-150 mm - - Amazon.com
GE RAK6053 Duct Adapter for GE PTACs
PANASONIC Duct Adaptor: Metal - 32NA44|FV-VS43R - Grainger
Dayton 6WZP3 $30.70 Round Duct Connector, 8In, Galv Steel | Zoro.com
AC INFINITY Duct Reducer, 8-Inch to 6-Inch Adapter Cone, Galvanized Steel - AC Infinity
6 Inch to 4 Inch HVAC Duct Reducer & Increaser - Galvanized Sheet Metal Ducting Connector for Airflow, Heating, Cooling, & Air Ventilation System Extra Strength and Fittings - Ducting Components - Amazon.com
Snap-in duct adapter for 4" ducting
16x12 Round Duct Reducer 16" to 12" Adapter | eBay
IMPERIAL 4-in dia x 3-in dia Duct Reducer in the Duct Reducers department at Lowes.com
B3620 Duct Adapter
FV-VS43R - Panasonic FV-VS43R - WhisperValue 4" Oval to 3" Round Duct Adapter
L.B. White 16 in. Duct 2 to 1 Adapter Kit for Foreman 500 & 750 - John M. Ellsworth Co. Inc.
Made in USA - 5" ID, Galvanized Duct Flange Adapter - 03233657 - MSC Industrial Supply
Snap-in duct adapter for 4" ducting
