RSF Onyx / Onyx 2 Secondary Air Tube Kit – Front Middle & Rear (FR-7.8.N/ FR-7.9.N/ FR-7.10.N)

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USD $100.03USD $300.10


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Product Description

This is a genuine RSF replacement secondary air tube kit for RSF Onyx Wood Fireplaces. You can purchase all three air tubes as a kit, or purchase each tube individually.  These air tubes ship new in their original packaging, they are not an aftermarket equivalent.

Part Number:

  • FR-8.N.- Middle Air Tube
  • FR-7.9.N- Front Air Tube
  • FR-7.10.N – Rear Air Tube

Part Description: RSF Opel Secondary Air Tube Kit.  The Onyx / Onyx 2 has three air tubes and this kit contains all three (rear, middle, front). You can purchase the tubes individually as well.

Applicable Models:

  • RSF Onyx
  • RSF Onyx 2
  • RSF Onyx AP

Check the part number, it may work in other RSF wood burning fireplaces.

Purpose: Secondary air tubes in wood burning appliances are designed to add preheated air to the top of the firebox.  The preheated air mixes with wood gases to create a clean burn ensuring optimal efficiency from your stove.  If they are damaged, cracked or deteriorating in any way, they should be replaced.

Installation tips:  Place a screwdriver (any style except flat head) into one of the air holes and tap it with a hammer/mallet to the left until the right end of the tube is freed.  To install a secondary air tube, reverse the above instructions.

IMPORTANT: All secondary air tubes must be in place for proper operation. Highlighted in yellow in product image.



These RSF Air Tubes are in stock and will ship within 1-2 business days.

Shipping Dimensions

Weight 3 lbs
Dimensions 24 × 3 × 3 in

Full Kit, Rear Air Tube (FR-7.10.N), Middle Air Tube (FR-7.8.N), Front Air Tube (FR-7.9.N)

Replacement parts come with a 90 day warranty unless otherwise stated.

All Gas or Pellet components must be installed by a licensed technician.
All Gas or Pellet component warranty claims must include installation receipt to qualify for warranty.

Please contact Online Store Support with any warranty questions.


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