Flue Systems for Cubic Mini

Cubic Mini Wood Stoves is a small stove manufacturer based in Canada.  Their small Grizzly stove and even smaller Cub stove are popular choices for very small spaces, or spaces that don't need very much heat.

Note:  Tiny Wood Stove is not affiliated with or endorsed by Cubic Mini Wood Stoves.

Where can I get a roof vent, trim plate, or pipe boot to fit Cubic Mini's double-wall pipe?

We don't hear this question as often since Cubic Mini started offering insulated roof exit kits, but it's still worth pointing out.

We don't recommend penetrating your roof with Cubic Mini's double-wall pipe for reasons we'll get into shortly.  However, if you decide to do that, please be aware that our 3" roof vent, trim plate, and pipe boot are meant to fit our 3" insulated pipe, which is 5" outer diameter.  They will not fit Cubic Mini's double-wall pipe.

Why not penetrate the roof with Cubic Mini's pipe?

The only acceptable metal chimney types for wood stoves to penetrate a structure are double-wall insulated chimney, or air-cooled triple wall chimney (see NFPA-211 Chapter 5, "Selection of Chimney and Vent Types").  Single-wall pipe and non-insulated double-wall pipe can be used for connector pipe between the stove and the chimney system, but for safety reasons, should not be used to make a roof or wall penetration.  

It’s possible that Cubic Mini pipe through your roof would stay cool enough to avoid damaging the surrounding combustibles during normal operation.  But if you have a chimney fire, non-insulated double-wall pipe is less likely to provide enough shielding to prevent the fire from spreading.

Cooler flue gases, however, can also create problems.  In cold weather, non-insulated pipe above the roof line allows flue gases to cool and condense.  Condensing gases inside the chimney can cause poor draft, excessive creosote build-up, and chimney fires.

We recommend using the Class A insulated double-wall pipe to pass through your roof and everything above the roof line.  This creates a safer, lower maintenance flue system, and better stove performance.

Cubic Mini Creosote

Can I connect my Cubic Mini to Tiny Wood Stove's 3" flue systems?

Yes!  Our 3" flue systems are a popular option for safely venting a Cubic Mini stove in tiny houses, cabins, vans, RVs, buses, yurts, and all sorts of small spaces.

Since our flue system is modular, it makes a very nice detachable chimney for use on vehicles.  It would be a little harder to do that with Cubic Mini's kit since the outer wall, inner wall, and insulation are separate pieces.

We also offer 3" 45 degree elbows, so you can offset your chimney with one of our flue kits.  Cubic mini only offers straight pipe.

The Cubic Mini flue flange is a little smaller than a standard 3" pipe, so you'll want to use our Cubic Mini adapter.  If you prefer not to use the adapter, you can hack the pipe a bit to make it fit.

Cubic Mini adapter for connecting Cubic Mini to standard 3" flue system
Cubic Mini Adapter with 3" Single-Wall Pipe
Cubic Mini Adapter connecting Cubic Mini double-wall pipe to standard 3" Class A insulated chimney pipe
Cubic Mini Adapter with Cubic Mini pipe

If you are using the Cubic Mini Wall Mount

Because the stovepipe in a wall mount configuration is so close to the wall, you can't use any single-wall pipe in a wall mount configuration.  Single-wall pipe requires 18" clearance to combustibles which can be reduced to 6" with a proper heat shield.  Double-wall pipe generally requires 9" clearance to combustibles which can be reduced to 3" with a proper heat shield.  (Note in Cubic Mini's product description: "Our flue pipe require a 3" clearance to combustibles with flue flashing the entire length."  Emphasis mine.)

You can use Cubic Mini's double-wall pipe for your connector pipe between your stove and the insulated chimney pipe, and Cubic Mini's heat shield kit the entire length.  Use our Cubic Mini adapter to connect the top of the Cubic Mini double-wall pipe to our single-to-double adapter below your ceiling.  Then continue through the ceiling with our insulated pipe all the way to the roof vent.

Alternatively, you can attach our 3" insulated pipe directly to the Cubic Mini flue flange.  Use a set of sheet metal crimpers to crimp the inner wall of the pipe to fit inside the flue flange.  We can also do this for you if you note your request in your order comments.

If you're using a floor mount, or mounting the stove on a cabinet

If you have at least 18" between the stovepipe and combustibles, or 6" with a proper heat shield, you can use single-wall pipe.  Cubic Mini doesn't recommend using single-wall pipe with their stove, but in our experience, it works well for limited lengths of connector pipe.  Mount our Cubic Mini adapter on the stove's flue flange, then continue with our single-wall pipe to the single-to-double adapter included in one of our 3" installation kits.

Using our single-wall pipe is especially helpful if you need to offset your chimney from the stove, since you can use a set of our 45 degree elbows with our single-wall pipe.  Cubic Mini doesn't recommend using 45 degree elbows for their stoves, but in our experience, two 45s works fine with an otherwise well-designed flue system.

If you don't need elbows in your connector pipe, you can use Cubic Mini's double-wall pipe instead of our single-wall pipe if you like.  Use our Cubic Mini adapter on top of the Cubic Mini pipe to adapt to our single-to-double adapter.  Then continue through the roof in insulated pipe, all the way to the chimney cap.

Finally, if you want to use an all insulated chimney, you can attach our insulated pipe directly to the Cubic Mini flue flange.  Use a set of sheet metal crimpers to crimp the inner wall of the pipe to fit inside the flue flange.  We can also do this for you if you note your request in your order comments.

Cubic Mini with Tiny Wood Stove Flue Kit
Photo Credit @oneida_journeys

How does Cubic Mini's Kit Compare to Tiny Wood Stove's Kit?

Tiny Wood Stove's kit costs more, but it is more complete, more modular, and offers more options for your small stove installation.

Tiny Wood Stove's kits include complete sections of modular Class A pipe.  Cubic Mini's kits do not include the 3" inner wall, so you'll need to buy that separately and assemble it yourself.  If you're using your chimney in a structure that moves, complete modular pipe makes it easy to take down and set up a detachable chimney.  We also offer a driving cap to block off your chimney while you're moving, or for off-season storage.

Cubic Mini does not offer any elbows for their pipe, so you have to do a straight roof exit.  If you need to offset your chimney, you can use Tiny Wood Stove's kit with 45 degree elbows.

Tiny Wood Stove also includes more features and options.  Our 3" roof vent includes side shields to protect your chimney against driving rain and high winds.  Our 3" Roof Support is more robust to hold your chimney steady even in high winds or on a moving vehicle.  Our storm collar sheds water away from your flashing for extra protection against roof leaks.  And our 3" telescoping pipe makes installation and maintenance easy, and absorbs vibrations for mobile installations.  An available extended roof support bracket provides extra lateral support for tall chimneys or high-wind areas.

See the full side-by-side comparison below.

Tiny Wood Stove 3" RV/Bus Kit

$426
  • Included - Roof Vent w/ Spark Arrestor Screen and Wind Shield
  • Included - GRAY Silicone Pipe Boot
  • Included - Ceiling Trim Plate
  • Included - Heavy-Duty Roof Support Brace
  • Included - Single-to-Double Adapter
  • Included - Complete, Modular Class A Insulated Pipe
  • Included - Storm Collar ($20 Value)
  • Included - Clamps for Securing Joints ($46 Value)
  • Included - Stove Cement ($8 Value)
  • Included - Telescoping Pipe ($45 Value)
  • Available - 45 Degree Elbows for Offsets
  • Available - Driving Cap for Mobile Installations
  • Available - Extended Roof Support for Tall Chimneys

Cubic Mini Metal Roof Exit

$241 kit, $56+ extras = $289
  • Included - Roof Vent w/ Spark Arrestor Screen
  • Included - ORANGE Silicone Pipe Boot
  • Included - Ceiling Trim Plate
  • Included - Roof Support L-Brackets
  • Included - Single-to-Double Transition Trim
  • Included - 5" Outer Wall and Insulation
  • NOT INCLUDED - 3" Inner Wall (add $48.00)
  • NOT INCLUDED - Clamps/Screws (add $??)
  • NOT INCLUDED - Stove Cement (add $8.00)
  • NOT AVAILABLE - Elbows
  • NOT AVAILABLE - Driving Cap for Mobile Installations
  • NOT AVAILABLE - Extended Roof Support for Tall Chimneys

A note on pipe boots and shingle roofs

Our flue kits include a pipe boot that works great for nonporous roofing materials like metal or rubber.  The base of the boot is flexible, so it can conform nicely to corrugated roofs.  If you have a standing seam metal roof, it's preferable to locate the roof penetration between the seams, so that the entire base of the boot is on a flat surface.

If you have shingles, you'll need a metal flashing that matches the outer diameter of the pipe (5" for our 3" insulated pipe), and your roof pitch, or you'll need to mount your pipe boot on a sheet of metal like Cubic Mini's shingle flashing.  Pipe boots generally can't be sealed directly to the surface of a shingle roof.

How to exit through the wall with a Cubic Mini

We don't recommend using a wall exit with a 3" stove.  In our experience, stoves with a 3" flue outlet are simply not powerful enough to draft reliabily with a wall exit.  You really need a well designed roof exit for a 3" stove like a Cubic Mini.

If you need a very small stove that will work with a wall exit, we recommend the Dwarf 3kW Standard.  The Dwarf 3kW is only slightly larger in output than the Cubic Mini Grizzly, but uses a 4" flue system, and can be installed using our 4" Wall Exit Kit.

Need help with your project?

Drop us a line at support@tinywoodstove.com if you need some help picking out your flue parts, or if there's anything else we can do to help with your project.

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