Rigid metallic conduit is most often used in commercial applications but can be a smart choice for straight runs of wire or cable through an attic garage basement or crawlspace.
In wall conduit for hdmi cables.
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In commercial applications if you are running cable between floors it must be cmr or cmp.
Configuration the hdmi cable 35 feet features corrosion resistant gold plated connectors full metal jacket heavy duty 26 awg triple shielding with solid copper conductors.
Hdmi cables 6m to 30m is assembled with hd5 cable.
By law all rated cables have these codes stamped on the outer jacket.
It also makes the addition and removal of cables easier but limits you to 4 5 cables.
Some hdmi cables that are rated for in wall use don t support 4k or hdr video.
If you are running cable through an air return it must be cmp.
Rigid conduit offers solid protection while flexible metal conduit allows for bends and twists without the use of extra hardware.
Fortunately there are some clever solutions such as baluns that use in wall rated network cable coax cable rg 6 or even fiber optic cable to pass audio and video signals over long distances.
The standard method install omits the raceway and lets the cables be installed freely within the wall.
In wall video and data cabling should be cl2 or cl3 in wall speaker cabling should be cl3.
The air free method uses a plastic channel within the wall as a raceway for your cables to travel along.