I will forgive you, if you forget mistering me...
Of those mentioned, only the type with free vertical surfaces have any ability to shake off cakes of soot, provided there is an ample fall down volume below.
Wrinkled fabric is excellently locking the soot at itself!
Here again: Hoddling a lot of square meters in a small bucket is not a working solution. It cloggs fast.
Well done filters work 30000 km without other service than emptying the bottom part of the filter container!
My favorite on the board is a "spanish dancing skirt", just forgot the genuine term! Ha! It is flamenco!
A vertical barrel with a sub-lid a bit under the normal one.
In this sub-lid, a 6 -- 8" center downpipe (thin SS), perforated with 3/4" smooth edged holes in circumferencial rings about 2" apart, hangs vertically.
One whole cloth ~7m long 110 cm (1,1m) broad is sewed to a tube.
But before that, along the length at intervals of 1m, a double seam is made "around the tube" with a contrasting colour for marking each meter of tube length.
The SS tube bottom end is closed. Gas will be taken out between the lid and the sub-lid through the barrel side.
The sub-lid is hanging on a welded-in carrying ring.
We make 15 circumferential "hole-rings" at intervals of 2".
6 holes 3/4" per ring.
Counting from top downwards, each second ring is free for gas sucking, each second is for the fabric to be spanned in place by an outside spanner. The hole-edges are giving a "grip" as the outside spanner is tighted.
Each "spanner head" has to be covered (by smooth metal or ss-mesh to avoid carving through the next abowe over-hanging layer).
7 "hula-hula" rings of AL (aluminium for some) tubing or thin SS tube, 1--1.5" diameter, ring diameter 13".
The assebling begins at the sub-lid end.
First the "mouth" of the filter canvas over the uppermost hole-ring and eaven-wrinkled, spanned in place (with protective mesh or folio applied inside and outside the spanner-head)
This first spanner has to cover well the 3/4" holes in the ring, so nothing leaks by from abowe!
Then the first hola-hola loop, and a spanner with a protected head at 1m of the "canvas tube".
Second hola-hola hoop in, protected spanner, 1m cavas, hola-hola hoop, spanner, 1m canvas, spanner...
The last spanner goes to the 15th hole-ring.
Here to be sharp! Here too the lower end spanner has to keep gases from leaking, this time from below!
When rised it should look like a symmetrical a christmas spruce!
The center tube would be ~34" or 86,4 cm in legth.
Below this you need ~45 cm for the lowest skirt bag, and
some 20 cm for settlement.
So from the sub-lid down to the bottom:
34" + 17.7" + 9" = 60.7" roughly...
Correct insulation is up to your mind!