B&B ThermoVent RV Duct Outlets: 2-Inch vs 4-Inch & Dampers

B&B Molders ThermoVents are round RV heating and cooling outlets made for either 2-inch or 4-inch flexible duct. The main choices are duct connection size, colour and whether the outlet includes an airflow damper. A round grille that looks similar from the front may have a completely different rear duct connection.

ThermoVent part-number comparison

Identify the base and face

For the no-damper versions, the manufacturer's illustration distinguishes the mounting base (B) from the visible cover (C). The numbers below identify the original components; the linked products are complete listed ThermoVent units, not separately offered base or cover pieces.

The 4-inch damper-equipped models have different complete OEM numbers: 94267 = 301-015-00010, 94268 = 301-015-00008, and 94269 = 301-015-00011.

Choose by the duct behind the vent

The ThermoVent series has a rotating face to aim airflow and a design that conceals the mounting screws. A damper adds the ability to reduce or close the flow at that outlet. Before ordering, inspect the existing vent's rear connection rather than assuming a front-face diameter establishes duct size.

View the available ThermoVent products

94261 — 2-inch ThermoVent, polar white, no damper

View 94261 product

94262 — 2-inch ThermoVent, black, no damper

View 94262 product

94264 — 4-inch ThermoVent, polar white, no damper

View 94264 product

94265 — 4-inch ThermoVent, black, no damper

View 94265 product

94266 — 4-inch ThermoVent, tan, no damper

View 94266 product

94267 — 4-inch ThermoVent, polar white, with damper

View 94267 product

94268 — 4-inch ThermoVent, black, with damper

View 94268 product

94269 — 4-inch ThermoVent, tan, with damper

View 94269 product

Before installing a replacement

1. Confirm whether the flexible duct is 2 inches or 4 inches at the vent connection.
2. Check the existing base and face style, mounting holes and clearance for the duct behind the wall or ceiling.
3. Match the original damper arrangement and choose the needed colour.
4. Keep the duct properly supported and avoid obstructing the RV's HVAC distribution system.

Manufacturer vent reference

The B&B Molders manufacturer parts catalog (PDF) includes the corresponding component illustrations and OEM reference numbers on printed page 57.

For the different CoolVent ceiling family, use the CoolVent 94271–94275 guide; the parts are not interchangeable just because both are round.