This brush cleans the exhaust elbow effectively when inserted from inside the exhaust blower housing. The channel leading into the elbow is irregular in cross section. Good brush for the job-bent it to fit. I haven't tried it yet on the heat exchanger, but I think it will work well on the fins.
Received as expected
Good quality brush that allows bending to any needed shape or angle.
Got exactly what I expected. Bristles are just right and cleans fine. Note the exposed metal endtip will scratch, so I put duct tape- a tiny cap should have been made.