The Transfer Register Box (TRB) was designed exclusively for use with WhisperValue fan and fan/light combinations. It provides room-to-room air distribution with ductless heat pumps.
Designed exclusively for WhisperValue fan and fan/light combinations, the Transfer Register Box (TRB) provides room-to-room powered circulation in (Multi-family)projects with ductless heat pumps. This 26 gauge steel, fire code rated accessory enables powered 60 CFM transfer at less than 0.3 sone when coupled with the FV-05VS3 WhisperValue fan, sold separately. No need for a radiation damper like on jump ducts; works with standard size HVAC registers - 4" x 10" HVAC supply.