I used to smoke cigars in my home office, and the ventilation was pretty much set up for that. My duct fan was connected to an active carbon filter in the ceiling, to make sure the smoke would not be noticeable outside and leak back in when the bedroom windows were open in the summer months. That happened once, and the girlfriend did not approve.

Anyway; after I got the homelab properly set up, smoking cigars in the office just didn’t feel right… All that smoke drawn into the servers, heat-sinks, filters and so on. Never mind the lungs, think of the servers! So it was time to rebuild the exhaust ventilation system to better suit my new needs.

Duct fan with noise-trap and active carbon filter, suspended from ceiling

So this is how it used to look, that needed to come down.

Duct fan mounted to ceiling

I removed the active carbon filter and the noise trap. I initially installed the noise trap because the distance between the intake and the fan was very short, and there were no bends. That allowed high-pitch noise from the fan itself to be quite audible. I figured I wouldn’t need it anymore with the longer duct runs.

Spiral ducts and T piece lying on the floor

I wanted the new exhaust system to be dual purpose; remove hot air from the homelab and solder fumes from the electronics lab. So I got a T-branch and spiral tubes which I cut into suitable lengths.

Spiral duct and suspension bands lying on the floor

Next, I cut and pre-bent suspension bands.

Duct fan connected to T piece and spiral ducts, suspended from ceiling

And the first section is up! I used two suspension bands on each side of the T-branch and connected it to the fan with a flexible duct. That allowed me to mount the spiral tubes a bit closer to the ceiling as the flexible duct could be bent upwards.

Spiral duct with bend, suspended above electronics workbench

I mounted a 90-degree bend and intake above my electronics lab, pretty much right over where I usually solder.

Duct fan connected to T piece spiral duct with air intake, suspended from ceiling

On the homelab side I first mounted a 90 degree bent towards the wall, then another to go down, and finished it with an intake there as well.

Spiral duct with bend, suspended above server rack

The idea here was the hot air from the servers could rise behind the rack and into the exhaust.

Office with server rack, computer desk and ventilation, RGB lighting

So this is how it turned out. I’m not sure how efficient the intake over the homelab is… It might be that the hot air pushed towards the wall behind the rack will spread in all direction and not really “rise” up like I imagined it would. Furthermore, I don’t have any convenient way of adjusting the airflow on the two intakes. I can rotate the disk on the intake, but it’s a bit annoying, might have to work out something better eventually.