Flue elbows
Tecnovis 90° Elbow Without Door, Ø 150 mm (5.91 in)
A rigid 2 mm (0.08 in) DC01 elbow stated without a door, offered in black or cast grey with the color references printed.
By Jean-Benoit Buisson
What the maker’s page says
A stove pipe angle element / 90 degree elbow, rigid, without a door, made of steel
sheet DC01 (St12) with a material thickness of 2 mm (0.08 in). It is stated for connection to
stoves and use in the living and visible area. The surface is stated to carry a
heat-resistant Senotherm lacquer coating. Assembly is stated to be simple, by
push-fit through drawn ends. It is stated to be available in the colors black
702.284 or cast grey 702.288, from a German brand manufacturer.
Without a door, said out loud
An elbow either has a cleaning opening or it does not, and the buyer has to pick.
This listing states which. A listing that says nothing leaves a buyer to work it out from a photograph.
Why it matters: the bend is where deposit starts. Every change of direction slows
the flue gas and lowers its temperature, and a cooling gas drops the tar and soot it
was carrying. A flue swept straight through still has a bend nobody reached.
Without a door, clearing that bend means taking the pipe off the stove.
Two reference numbers
702.284 and 702.288.
A color given a reference rather than a name solves a real problem.
Stove pipe comes in black and in cast grey, and both vary between manufacturers — a
cast grey elbow beside a cast grey pipe from a different maker is two greys, at eye
level, in a living room.
A reference number lets the whole run be ordered in one finish: pipes, elbow,
rosette, wall sleeve. It is the sort of thing that only appears on a listing from a
maker with a catalog behind it.
DC01, again
Cold-rolled mild steel, named.
It is the ordinary material for single-wall flue pipe and naming it claims nothing —
which is why it is worth noticing. Few listings name this grade; most say steel.
For the living area
Stated, and it is the distinction that matters.
Fire-aluminized sheet is the cheaper alternative, only conditionally suitable for
the visible area because it may discolour at high temperatures.
This one is 2 mm (0.08 in) steel with a baked lacquer, specified for a room somebody sits in.
That is what the extra money buys, and it is worth stating because both parts do the
same job in the same flue.
What the sheet leaves out
A temperature, a class, a standard.
Some elbows publish a class under a named standard. This one publishes
a material, a thickness, a coating and two color references — which is a different
kind of completeness.
Availability
On November 13, 2026, the reference appeared in the American Amazon catalog, with no seller behind it.
