JR Products RV Floor Registers: Cutout Sizes & Dampers

Replacing a scratched, bent or missing RV floor vent? A floor register has two important dimensions: the duct cutout that fits into the floor, and the outer grille that covers the opening. JR Products offers black steel replacements with and without adjustable dampers. Compare the precise part number before ordering.

Measure the floor opening and outer grille

  1. Remove the old register and measure the rectangular opening in the floor, not just the visible face.
  2. Measure the outside face of the old grille to ensure the new one covers the flooring edges without hitting adjacent trim.
  3. Inspect duct depth, mounting-screw holes and obstructions. The nominal cutout size does not guarantee identical screw positions.
  4. Check whether the original uses a manually adjustable damper or an undampered grille.

JR Products floor register dimensions by MPN

MPN Duct cutout Outside grille dimensions Damper
0229135 2 × 10 in 3¾ × 11½ in Yes
0229145 2 × 10 in 3¾ × 11½ in No
0229155 4 × 8 in 5⅝ × 9⅝ in Yes
0229165 4 × 8 in 5⅝ × 9⅝ in No
0229175 4 × 10 in 5 9/16 × 11½ in Yes

These are manufacturer's nominal cutout and outer-face dimensions. All five are black powder-coated steel floor-mount registers. Verify the actual opening and screw placement before replacing an OEM register.

Dampered versus undampered: which one belongs here?

Dampered registers—0229135, 0229155 and 0229175—have a manually adjustable airflow control. Undampered 0229145 and 0229165 allow unobstructed flow through the grille, without a built-in adjustment.

Heating-system consideration: Do not close off more floor outlets than the furnace or ducting manufacturer permits. RV furnaces require adequate airflow; use the damper arrangement specified for your heating system rather than adding shutoffs indiscriminately.

Common selection questions

Will a 2 × 10 grille fit a 4 × 8 floor cutout? No. Those dimensions describe different opening shapes, regardless of similar total area.

Can I switch from undampered to dampered? Only if the grille fits and the appliance/duct design permits adjusting that branch. The change affects air distribution and may affect total airflow.

Is the outside grille the same size as the duct hole? No. For example, the manufacturer's 2 × 10 opening is covered by a grille measuring approximately 3¾ × 11½ inches.

Compare five exact floor register listings

Select the matching duct cutout and damper configuration, then open the individual product to check current availability and package details.

Related interior register references

For other vent styles and dimensions, see our RV Designer register size and damper reference. Different brands may use different grille faces and mounting details even when the nominal opening is the same.

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