EZ Plenum 21"-Inch Large Triangle Air Distribution Box Knocked-Down R6 Fiberglass bearings and Keystoker 90/105 coal stove

and Keystoker 90/105 coal stove branded units

HC39GE468A

This is a Genuine Original Equipment Manufacturer (OEM) Carrier part# EF33CW189

Ultra V155

This is a Genuine Original Equipment Manufacturer (OEM) Trane part# MOT18820

EZ Plenum 21"-Inch Large Triangle Air Distribution Box Knocked-Down R6 Fiberglass bearings and Keystoker 90/105 coal stoveThis is a R6 rated fiberglass "knocked down" 21" inch large triangle air distribution terminal box. This triangular air distribution box is also referred to as a "tri box" and is shipped "knocked down", meaning it is prefabricated but requires assembling (tape is NOT included). The standard height of this triangle air distribution box when assembled is about 23" inches high. Outside Dimensions: 21"x21"x21" Inside Dimensions: 18"x18"x18" Height