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RSF Secondary Air Tubes – Onyx (FR-7.8.N / FR-7.9.N / FR-7.10.N )


Genuine RSF replacement secondary air tubes for RSF Onyx wood burning fireplaces.

Note: There are three different secondary air tubes for the RSF Onyx. All three are purchasable from this page, either individually or as a set.

Make your choice from the drop down menu then click the Add to Cart button.

What are Secondary Air Tubes?

Secondary air tubes serve the purpose of adding preheated air into the upper portion of the firebox. This allows for optimal burning efficiency.

How do I know when my secondary air tubes need replacing?

Secondary air tubes should be cleaned regularly, but with age air tubes begin to warp, crack, and deteriorate. Once this happens it obstructs airflow and leads to lower efficiency and heat output. They should be replaced if any damage is noticed.

How to replace Onyx secondary air tubes?

To remove your old air tubes take a screwdriver (any type is fine except flat head) and place it in one of the air tube holes. Then with a mallet gently (or not so gently depending on how stubborn it is) hit the base of the screwdriver toward the left hand side of your fireplace. Once the right end comes loose you can pull it down and out.

To install your new air tube you’ll basically do the opposite. Put the left end into place first, then you should be able to shove it to the right into place. If necessary use the mallet and screwdriver trick (to the right this time) to make sure it is firmly in place.

OEM Part Numbers:

  • 7.9.N – front secondary air tube.
  • 7.8.N – middle secondary air tube.
  • 7.10.N – rear secondary air tube.

Applicable Models:

  • RSF Onyx
  • RSF Onyx 2
  • RSF Onyx AP

These parts may fit other RSF products as well. Please consult your owner’s manual to confirm.

WoodChimney.com stocks and sells other RSF replacement parts.  Please contact us if your part is not listed on our website.

This genuine RSF Onyx secondary air tubes are in stock and ready to ship.

Weight 3 lbs
Dimensions 24 × 3 × 3 in
Air Tubes

Front Air Tube, Middle Air Tube, Rear Air Tubes, Full Set of three


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